Nabble - ShapeLib

Re: Shapelib 1.3.0 alpha 2

2009-10-18T21:26:54Z

I built the library with VC++ 2008 and it built OK. I also fixed the snprintf issue, I wasn't aware there was already a fix. Unfortunately not everything works. I am running under windows 7 and am getting a protected memory violation error on DBFReadStringAttribute(). This sounds similar to a post I saw in March 2008 from two people with a similar error there.

Unfortunately I am not a C++ developer, but a C# developer. I don't know enough to put together a VC++ debugger to step into the code. I am using the .Net wrapper provided by someone else. It was all running fine under XP. I double checked the wrapper's function signatures and everything matches up, including the structs that are used.

The C# wrapper included a binary built with an older codebase. Then under windows 7 the shapelib.dll would not load at all, it threw error messages that the shapelib.dll file could not be found. I knew it was finding it, so I decided to rebuild it with a newer version, and downloaded the alpha to try. I followed the instructions for building with VC++, fixed the snprintf issue and now it loads and will accept most calls, but I get the above error. The rest of the lib calls seem to be OK.

Any ideas? Is anyone else using the library under windows vista or windows 7? If someone has a visual studio project already setup that they can send me I can then work on a fix. I can work with the C code OK, it's been a few years, but I don't know the IDE well enough to setup the project.

If no one else is seeing this or knows of a fix, I will probably replace the dbase calls with C# and ADO.Net in the wrapper since that's what I am familiar with.

Scott

Bram de Greve wrote:

Frank Warmerdam wrote:
> Bram de Greve wrote:
>
>> Hi Frank,
>>
>> I tried to build the alpha on windows, and had to fix a snprintf issue
>> to get things compiling. Other than that, it seems find ...
>> Do you want me to commit it to CVS? If I can find back my credentials,
>> that is =)
>>
>
> Bram,
>
> If you have your commit info, please go ahead. Otherwise you can forward
> a patch.
>
> Best regards,
>

Hi Frank,

It's done =)

Bram
_______________________________________________
Shapelib mailing list
Shapelib@lists.maptools.org
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Shapelib 1.3.0 alpha 2

2009-09-17T13:51:18Z

Frank Warmerdam wrote:

> Bram de Greve wrote:
>
>> Hi Frank,
>>
>> I tried to build the alpha on windows, and had to fix a snprintf issue
>> to get things compiling. Other than that, it seems find ...
>> Do you want me to commit it to CVS? If I can find back my credentials,
>> that is =)
>>
>
> Bram,
>
> If you have your commit info, please go ahead. Otherwise you can forward
> a patch.
>
> Best regards,
>

Hi Frank,

It's done =)

Bram
_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Shapelib 1.3.0 alpha 2

2009-09-17T12:59:16Z

Bram de Greve wrote:
> Hi Frank,
>
> I tried to build the alpha on windows, and had to fix a snprintf issue
> to get things compiling. Other than that, it seems find ...
> Do you want me to commit it to CVS? If I can find back my credentials,
> that is =)

Bram,

If you have your commit info, please go ahead. Otherwise you can forward
a patch.

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Shapelib 1.3.0 alpha 2

2009-09-17T11:11:30Z

Hi Frank,

I tried to build the alpha on windows, and had to fix a snprintf issue
to get things compiling. Other than that, it seems find ...
Do you want me to commit it to CVS? If I can find back my credentials,
that is =)

Bram

Frank Warmerdam wrote:

> Folks,
>
> I have been negligent for years in producing a new Shapelib release
> despite a bunch of ongoing work - mostly driven by the needs of GDAL/OGR.
>
> I have made a few updates to the web page, including anonymous CVS access
> information and a pointer to the alternate download site.
>
> http://shapelib.maptools.org/
>
> I have also uploaded a 1.3.0 "alpha 2" release at:
>
> http://download.osgeo.org/shapelib/shapelib-1.3.0a2.zip
> http://download.osgeo.org/shapelib/shapelib-1.3.0a2.tar.gz
>
> I have yet to properly document recent changes, but I'd appreciate feedback
> leading up to a formal 1.3.0 release.
>
> Best regards,
>

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Shapelib Digest, Vol 59, Issue 1

2009-09-06T06:38:41Z

Looks like it works fine on snow leopard....

Darwin macbook.local 10.0.0 Darwin Kernel Version 10.0.0: Fri Jul 31
22:47:34 PDT 2009; root:xnu-1456.1.25~1/RELEASE_I386 i386
macbook:shapelib-1.3.0a2 hamannj$

macbook:shapelib-1.3.0a2 hamannj$ make test
******* Stream 2 Succeeded *********
******* Stream 3 Succeeded *********
macbook:shapelib-1.3.0a2 hamannj$

On Sep 5, 2009, at 10:00 AM, shapelib-request@... wrote:

> Send Shapelib mailing list submissions to
> shapelib@...
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://lists.maptools.org/mailman/listinfo/shapelib
> or, via email, send a message with subject or body 'help' to
> shapelib-request@...
>
> You can reach the person managing the list at
> shapelib-owner@...
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Shapelib digest..."
>
>
> Today's Topics:
>
> 1. Shapelib 1.3.0 alpha 2 (Frank Warmerdam)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 04 Sep 2009 13:28:11 -0400
> From: Frank Warmerdam <warmerdam@...>
> Subject: [Shapelib] Shapelib 1.3.0 alpha 2
> To: Shapelib Development <shapelib@...>
> Message-ID: <4AA14E2B.9050301@...>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Folks,
>
> I have been negligent for years in producing a new Shapelib release
> despite a bunch of ongoing work - mostly driven by the needs of GDAL/
> OGR.
>
> I have made a few updates to the web page, including anonymous CVS
> access
> information and a pointer to the alternate download site.
>
> http://shapelib.maptools.org/
>
> I have also uploaded a 1.3.0 "alpha 2" release at:
>
> http://download.osgeo.org/shapelib/shapelib-1.3.0a2.zip
> http://download.osgeo.org/shapelib/shapelib-1.3.0a2.tar.gz
>
> I have yet to properly document recent changes, but I'd appreciate
> feedback
> leading up to a formal 1.3.0 release.
>
> Best regards,
> --
> ---------------------------------------
> +--------------------------------------
> I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush | Geospatial Programmer for
> Rent
>
>
>
> ------------------------------
>
> _______________________________________________
> Shapelib mailing list
> Shapelib@...
> http://lists.maptools.org/mailman/listinfo/shapelib
>
>
> End of Shapelib Digest, Vol 59, Issue 1
> ***************************************

Jeff Hamann, PhD
PO Box 1421
Corvallis, Oregon 97339-1421
541-754-2457
jeff.hamann[at]forestinformatics[dot]com
http://www.forestinformatics.com

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Shapelib 1.3.0 alpha 2

2009-09-04T10:28:11Z

Folks,

I have been negligent for years in producing a new Shapelib release
despite a bunch of ongoing work - mostly driven by the needs of GDAL/OGR.

I have made a few updates to the web page, including anonymous CVS access
information and a pointer to the alternate download site.

http://shapelib.maptools.org/

I have also uploaded a 1.3.0 "alpha 2" release at:

http://download.osgeo.org/shapelib/shapelib-1.3.0a2.zip
http://download.osgeo.org/shapelib/shapelib-1.3.0a2.tar.gz

I have yet to properly document recent changes, but I'd appreciate feedback
leading up to a formal 1.3.0 release.

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Multipart polygon

2009-08-19T06:35:49Z

Hello,

Could you send me your conversor code to I study it?
I'm studing kml and i like understand the convertion from shapefile to kml file.

Thanks!!
Murilo

Daan64 wrote:

Hello,

I am reading a polygon shapefile with shapelib and converting it to KML.
My polygons are multi polygons with possible holes.

The SHPObject returns a list of vertices and a list of indexes pointing to the starting vertex of each part. With the direction of the vertices (clockwise or not) I determine weather a part is a hole or not.

I am not sure about the order of the parts.

For example we have a multi polygon consisting of 2 polygons A_pol and B_pol with both a hole, respectively A_hole and B_hole.

The question is if the shapefile format guarantees that holes are always listed after the polygon they belong to. So the order would be either A_pol, A_hole, B_pol, B_hole or B_pol, B_hole, A_pol, A_hole

and not for example A_pol, B_hole, B_pol, A_hole or A_pol, B_pol, A_hole, B_hole.
Because in the latter case I would need to check for each encountered hole to which polygon it belongs....

Thanks for any answers, Daan

Re: Character field longer than 255

2009-08-10T09:26:22Z

Hello,

Since this afternoon, I have searched and I have find a more recent
shapefile library in gdal project. And in the gdal version, the character
field can be written with a length longer than 255, but it is read as it
have a length codded only on the first byte.

So, what's happenning ? What is the rule ? Why theses exceptions for
character fields ?

In http://trac.osgeo.org/gdal/ticket/1202 Frank W. said that there were a
fix in shapelib, but I don't see any release after 1.2.10 in april 2003. If
a more recent shapelib exists, where it is ?

Thanks,

Jérôme Cuinet
----- Original Message -----
From: "Jérôme Cuinet" <jerome.cuinet@...>
To: <shapelib@...>
Sent: Monday, August 10, 2009 3:39 PM
Subject: [Shapelib] Character field longer than 255

Hello,

Contrary to Xbase (.dbf) File Format Description
(http://www.clicketyclick.dk/databases/xbase/format/), with Shapefile
library we can add to a .dbf file a character field with a length longer
than 255 character. Is it an extension to dbf file format or an unique
shapelib specification ?

I want to use this function, but I'm worried about compatibility with other
shapefile drivers. Should I use these only for my program, or I could use
these shapefiles with another programs ?

Thanks

Jérôme Cuinet

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Character field longer than 255

2009-08-10T06:39:51Z

Hello,

Contrary to Xbase (.dbf) File Format Description
(http://www.clicketyclick.dk/databases/xbase/format/), with Shapefile
library we can add to a .dbf file a character field with a length longer
than 255 character. Is it an extension to dbf file format or an unique
shapelib specification ?

I want to use this function, but I'm worried about compatibility with other
shapefile drivers. Should I use these only for my program, or I could use
these shapefiles with another programs ?

Thanks

Jérôme Cuinet

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

shpproj help

2009-07-31T11:54:28Z

Hi,

I have a set of shapefiles that are in what I have always been told are
"unprojected longitude & latitude."

X & Y coordinates are in decimal degrees ( -92.5173861 x 42. 9431848) with
a datum of WGS84

I am trying to use shpproj to convert these files to UTM Zone data (Zone 15,
in my example) for some further analysis.

The following don't work:

shpproj jack jackson-soils-UTM -i=geographic -o="proj=utm zone=15 units=m"
shpproj jack jackson-soils-UTM -o="proj=utm zone=15 units=m"

The processis aborted with the note, "unable to process projection, exiting"

I suspect that some data files may be missing, but I have no way of figuring
that out.

BTW, the "proj" directive "works" but doesn't give me any good clues
either.

Any suggestions would be greatly appreciated.

Ken

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Creating an Arc

2009-07-27T20:47:38Z

>Scott,

>It is all part of GDAL/OGR (http://www.gdal.org).

>But since the code is not written in terms of SHPObject you are going to
>have
>to do a bunch of restructuring. So best to treat this code as an example
>and
>avoid dragging in the actual classes references.

I'll go over it and see how far I get.

I was hoping this was a common question with an obvious answer :-)

Thanks again Frank you've been a huge help!

Regards,

-----Original Message-----
From: shapelib-bounces@...
[mailto:shapelib-bounces@...] On Behalf Of Frank Warmerdam
Sent: Tuesday, July 28, 2009 3:31 PM
To: Shapelib Development
Subject: Re: [Shapelib] Creating an Arc

Scott Ferguson wrote:
> Thanks Frank!
>
> I could make better sense of it if I could see the includes too, or at
least
> see the OGRLineString class.
>
> Would it be possible for you to post them, or you could email them
directly
> to me if that is preferred?

Scott,

It is all part of GDAL/OGR (http://www.gdal.org).

But since the code is not written in terms of SHPObject you are going to
have
to do a bunch of restructuring. So best to treat this code as an example
and
avoid dragging in the actual classes references.

Best regards,
--
---------------------------------------+------------------------------------
--
I set the clouds in motion - turn up | Frank Warmerdam,
warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Creating an Arc

2009-07-27T20:30:59Z

Scott Ferguson wrote:
> Thanks Frank!
>
> I could make better sense of it if I could see the includes too, or at least
> see the OGRLineString class.
>
> Would it be possible for you to post them, or you could email them directly
> to me if that is preferred?

Scott,

It is all part of GDAL/OGR (http://www.gdal.org).

But since the code is not written in terms of SHPObject you are going to have
to do a bunch of restructuring. So best to treat this code as an example and
avoid dragging in the actual classes references.

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Creating an Arc

2009-07-27T20:26:51Z

Thanks Frank!

I could make better sense of it if I could see the includes too, or at least
see the OGRLineString class.

Would it be possible for you to post them, or you could email them directly
to me if that is preferred?

Thanks again for your help

Regards,

-----Original Message-----
From: shapelib-bounces@...
[mailto:shapelib-bounces@...] On Behalf Of Frank Warmerdam
Sent: Tuesday, July 28, 2009 2:36 PM
To: Shapelib Development
Subject: Re: [Shapelib] Creating an Arc

Sling Blade wrote:
>
> You are correct that shapefiles cannot store curved arcs. The normal
> technique is to approximate them as polylines.
>
>
> What would be great would be to learn how to approximate an Arc with
> Polylines. Do you have any code showing how this is done?
>
> Regards

Sling,

There is some example code for converting arcs to polylines in:

http://svn.osgeo.org/gdal/trunk/gdal/ogr/ogrsf_frmts/oci/ogrocistroke.cpp

A lot depends on how your arcs are defined.

Best regards,
--
---------------------------------------+------------------------------------
--
I set the clouds in motion - turn up | Frank Warmerdam,
warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Creating an Arc

2009-07-27T19:36:02Z

Sling Blade wrote:
>
> You are correct that shapefiles cannot store curved arcs. The normal
> technique is to approximate them as polylines.
>
>
> What would be great would be to learn how to approximate an Arc with
> Polylines. Do you have any code showing how this is done?
>
> Regards

Sling,

There is some example code for converting arcs to polylines in:

http://svn.osgeo.org/gdal/trunk/gdal/ogr/ogrsf_frmts/oci/ogrocistroke.cpp

A lot depends on how your arcs are defined.

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Creating an Arc

2009-07-27T18:16:42Z

You are correct that shapefiles cannot store curved arcs. The normal
technique is to approximate them as polylines.

What would be great would be to learn how to approximate an Arc with Polylines. Do you have any code showing how this is done?

Regards

Re: Creating an Arc

2009-07-27T17:43:40Z

Scott Ferguson wrote:
> Hi,
>
> I need to create an Arc in a shape file. Is this possible using shapelib? My
> understanding is that only points, polylines and polygons can be created so
> what I probably need is a way to convert an Arc to a collection of
> Polylines, is that correct?
>
>
> Does any one have an example of creating Arcs they can share with me?

Scott,

You are correct that shapefiles cannot store curved arcs. The normal
technique is to approximate them as polylines.

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Creating an Arc

2009-07-27T14:40:18Z

Hi,

I need to create an Arc in a shape file. Is this possible using shapelib? My
understanding is that only points, polylines and polygons can be created so
what I probably need is a way to convert an Arc to a collection of
Polylines, is that correct?

Does any one have an example of creating Arcs they can share with me?

Regards

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Including shapelib.dll in Visual C++ 2008 Express project

2009-06-21T12:44:37Z

Hi Sanak,

thank you very much, your example builds also in my environment. This helps a lot.

Enjoy the rest of the sunday,
regards
Raphael

Sanak wrote:

Hi Raphael,

I think that Dllimport definition and re-definition of shapelib api are not
necessary,
but I don't know what is the cause...

So, please refer the attach file (includes shapelib and shapelib-api call
sample(copy from shpcreate.c), and both build successfully in my
environment).

Regards,

Sanak.

Re: Including shapelib.dll in Visual C++ 2008 Express project

2009-06-21T11:43:09Z

Hi Raphael,

I think that Dllimport definition and re-definition of shapelib api are not necessary,
but I don't know what is the cause...

So, please refer the attach file (includes shapelib and shapelib-api call sample(copy from shpcreate.c), and both build successfully in my environment).

Regards,

Sanak.

2009/6/22 raphael_mws <r.speck@...>

Hi Sanak,

thanks for the answer. I tried what you told me and rebuilt the shapelib
project with the new C/C++ preprocessor commands, but it didn't change
anything.

I think I am doing something wrong when accessing the DLL functions. This is
a short sample code:

<start>
#define DllImport __declspec( dllimport )
#include <iostream>
#include "stdafx.h"
#include "D:\Visual Studio 2008\Projects\Shapelib-1_2_10-mod\shapefil.h"
using namespace std;

DllImport SHPHandle SHPAPI_CALL SHPOpen();

int _tmain(int argc, _TCHAR* argv[])
{
SHPHandle testhandle; //this works - the compiler finds shapefil.h
SHPOpen("test","test"); //this produces the error

return 0;
}
<end>

This is the compiler output:

1>Verknüpfen... 1>ShapefileCreator.obj : error LNK2019: Verweis auf nicht
aufgelöstes externes Symbol "_SHPOpen" in Funktion "_wmain". 1>D:\Visual
Studio
2008\Projects\ShapefileCreator\ShapefileCreator\Debug\ShapefileCreator.exe :
fatal error LNK1120: 1 nicht aufgelöste externe Verweise.

The same as before.

I added the path to the DLL/LIB file in the Linker section of the VC
property page of my project and to the general search paths. This should be
sufficient, or not?

Regards,
Raphael

Sanak wrote:
>
> Hi Raphael,
>
> It seems that the original Visual C++ shapelib project preprocessor
> definitions are invalid. (generated shapelib.lib and shapelib.dll symbols
> are incompatible)
>
> Please try as follows,
> 1. modify shapelib project C/C++ preprocessor definition from VC property
> page
> SHPAPI_CALL=__stdcall
> --> SHAPELIB_DLLEXPORT
> 2. modify each source files(dbfopen.c/shpopen.c/shptree.c) C/C++
> preprocessor definition from VC property page
> SHAPELIB_EXPORTS;SHPAPI_CALL=__stdcall;$(NoInherit)
> --> SHAPELIB_DLLEXPORT
> 3. rebuild shapelib project.
> 4. import generated shapelib.lib to your project and build.
>
> Regards,
>
> Sanak.
>
> 2009/6/21 raphael_mws <r.speck@...>
>
>>
>> Hi folks,
>>
>> I am having a real hard time including the shapelib.dll in my VC++ 2008
>> project. I did the following:
>>
>> - recompile the Visual C++ shapelib project from
>> http://dl.maptools.org/dl/shapelib/contrib/DotNetArchive.zip. This worked
>> fine, and I got the output dll and lib files.
>>
>> - include the shapefil.h in my .cpp file successfully
>>
>> - tried various possibilities to get the shapelib.dll in the correct
>> PATH.
>> Actually, it should be found by the compiler, I even tried putting it
>> into
>> C:\WINDOWS\system32 to make sure that's not the problem.
>>
>> - experimented with various combinations of __declspec( dllimport ) to
>> import the functions from the dll
>>
>> When I try to compile, I always get the following error:
>> "error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "_SHPOpen"
>> in
>> Funktion "_wmain"."
>> (in English: unreferenced extern symbol "... )
>>
>> Can anybody please give me a hint what I might be doing wrong? Or, even
>> better, send me a sample VC project using shapelib.dll?
>>
>> Thanks and kind regards,
>> Raphael
>> --
>> View this message in context:
>> http://www.nabble.com/Including-shapelib.dll-in-Visual-C%2B%2B-2008-Express-project-tp24132517p24132517.html
>> Sent from the ShapeLib mailing list archive at Nabble.com.
>>
>> _______________________________________________
>> Shapelib mailing list
>> Shapelib@...
>> http://lists.maptools.org/mailman/listinfo/shapelib
>>
>
> _______________________________________________
> Shapelib mailing list
> Shapelib@...
> http://lists.maptools.org/mailman/listinfo/shapelib
>
>

--
View this message in context: http://www.nabble.com/Including-shapelib.dll-in-Visual-C%2B%2B-2008-Express-project-tp24132517p24136300.html

Sent from the ShapeLib mailing list archive at Nabble.com.

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

shapelib_sample.zip (52K) Download Attachment

Re: Including shapelib.dll in Visual C++ 2008 Express project

2009-06-21T09:44:43Z

Hi Sanak,

thanks for the answer. I tried what you told me and rebuilt the shapelib project with the new C/C++ preprocessor commands, but it didn't change anything.

I think I am doing something wrong when accessing the DLL functions. This is a short sample code:

<start>
#define DllImport __declspec( dllimport )
#include <iostream>
#include "stdafx.h"
#include "D:\Visual Studio 2008\Projects\Shapelib-1_2_10-mod\shapefil.h"
using namespace std;

DllImport SHPHandle SHPAPI_CALL SHPOpen();

int _tmain(int argc, _TCHAR* argv[])
{
SHPHandle testhandle; //this works - the compiler finds shapefil.h
SHPOpen("test","test"); //this produces the error

return 0;
}
<end>

This is the compiler output:

1>Verknüpfen... 1>ShapefileCreator.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "_SHPOpen" in Funktion "_wmain". 1>D:\Visual Studio 2008\Projects\ShapefileCreator\ShapefileCreator\Debug\ShapefileCreator.exe : fatal error LNK1120: 1 nicht aufgelöste externe Verweise.

The same as before.

I added the path to the DLL/LIB file in the Linker section of the VC property page of my project and to the general search paths. This should be sufficient, or not?

Regards,
Raphael

Sanak wrote:

Hi Raphael,

It seems that the original Visual C++ shapelib project preprocessor
definitions are invalid. (generated shapelib.lib and shapelib.dll symbols
are incompatible)

Please try as follows,
1. modify shapelib project C/C++ preprocessor definition from VC property
page
SHPAPI_CALL=__stdcall
--> SHAPELIB_DLLEXPORT
2. modify each source files(dbfopen.c/shpopen.c/shptree.c) C/C++
preprocessor definition from VC property page
SHAPELIB_EXPORTS;SHPAPI_CALL=__stdcall;$(NoInherit)
--> SHAPELIB_DLLEXPORT
3. rebuild shapelib project.
4. import generated shapelib.lib to your project and build.

Regards,

Sanak.

2009/6/21 raphael_mws <r.speck@minewolf.com>

>
> Hi folks,
>
> I am having a real hard time including the shapelib.dll in my VC++ 2008
> project. I did the following:
>
> - recompile the Visual C++ shapelib project from
> http://dl.maptools.org/dl/shapelib/contrib/DotNetArchive.zip. This worked
> fine, and I got the output dll and lib files.
>
> - include the shapefil.h in my .cpp file successfully
>
> - tried various possibilities to get the shapelib.dll in the correct PATH.
> Actually, it should be found by the compiler, I even tried putting it into
> C:\WINDOWS\system32 to make sure that's not the problem.
>
> - experimented with various combinations of __declspec( dllimport ) to
> import the functions from the dll
>
> When I try to compile, I always get the following error:
> "error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "_SHPOpen" in
> Funktion "_wmain"."
> (in English: unreferenced extern symbol "... )
>
> Can anybody please give me a hint what I might be doing wrong? Or, even
> better, send me a sample VC project using shapelib.dll?
>
> Thanks and kind regards,
> Raphael
> --
> View this message in context:
> http://www.nabble.com/Including-shapelib.dll-in-Visual-C%2B%2B-2008-Express-project-tp24132517p24132517.html
> Sent from the ShapeLib mailing list archive at Nabble.com.
>
> _______________________________________________
> Shapelib mailing list
> Shapelib@lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/shapelib
>

_______________________________________________
Shapelib mailing list
Shapelib@lists.maptools.org
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Including shapelib.dll in Visual C++ 2008 Express project

2009-06-21T05:42:43Z

Hi Raphael,

It seems that the original Visual C++ shapelib project preprocessor definitions are invalid. (generated shapelib.lib and shapelib.dll symbols are incompatible)

Please try as follows,
1. modify shapelib project C/C++ preprocessor definition from VC property page
   SHPAPI_CALL=__stdcall
     --> SHAPELIB_DLLEXPORT
2. modify each source files(dbfopen.c/shpopen.c/shptree.c) C/C++ preprocessor definition from VC property page
SHAPELIB_EXPORTS;SHPAPI_CALL=__stdcall;$(NoInherit)
     --> SHAPELIB_DLLEXPORT
3. rebuild shapelib project.
4. import generated shapelib.lib to your project and build.

Regards,

Sanak.

2009/6/21 raphael_mws <r.speck@...>

Hi folks,

I am having a real hard time including the shapelib.dll in my VC++ 2008
project. I did the following:

- recompile the Visual C++ shapelib project from
http://dl.maptools.org/dl/shapelib/contrib/DotNetArchive.zip. This worked
fine, and I got the output dll and lib files.

- include the shapefil.h in my .cpp file successfully

- tried various possibilities to get the shapelib.dll in the correct PATH.
Actually, it should be found by the compiler, I even tried putting it into
C:\WINDOWS\system32 to make sure that's not the problem.

- experimented with various combinations of __declspec( dllimport ) to
import the functions from the dll

When I try to compile, I always get the following error:
"error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "_SHPOpen" in
Funktion "_wmain"."
(in English: unreferenced extern symbol "... )

Can anybody please give me a hint what I might be doing wrong? Or, even
better, send me a sample VC project using shapelib.dll?

Thanks and kind regards,
Raphael
--
View this message in context: http://www.nabble.com/Including-shapelib.dll-in-Visual-C%2B%2B-2008-Express-project-tp24132517p24132517.html
Sent from the ShapeLib mailing list archive at Nabble.com.

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Including shapelib.dll in Visual C++ 2008 Express project

2009-06-21T01:38:34Z

Hi folks,

I am having a real hard time including the shapelib.dll in my VC++ 2008 project. I did the following:

- recompile the Visual C++ shapelib project from http://dl.maptools.org/dl/shapelib/contrib/DotNetArchive.zip. This worked fine, and I got the output dll and lib files.

- include the shapefil.h in my .cpp file successfully

- tried various possibilities to get the shapelib.dll in the correct PATH. Actually, it should be found by the compiler, I even tried putting it into C:\WINDOWS\system32 to make sure that's not the problem.

- experimented with various combinations of __declspec( dllimport ) to import the functions from the dll

When I try to compile, I always get the following error:
"error LNK2019: Verweis auf nicht aufgelöstes externes Symbol "_SHPOpen" in Funktion "_wmain"."
(in English: unreferenced extern symbol "... )

Can anybody please give me a hint what I might be doing wrong? Or, even better, send me a sample VC project using shapelib.dll?

Thanks and kind regards,
Raphael

Hosam ZAWIA is out of the office.

2009-06-15T07:01:37Z

I will be out of the office starting 14/06/2009 and will not return until 22/06/2009.

I will respond to your message when I return.
_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Nearest lines for points.

2009-06-15T02:54:40Z

Hi!

I have some line shapes and one points shape and I need to find the nearest line from each point. To make that I want use the SHPTree library but I have some questions:

1.- Do I need to compute the bounding box of all line shapes to create the SHPTree object?

2.- Do I need to read all objects of each line shape, find it in the tree and save his objects into

SHPTreeNode->papsShapeObj matrix?

3.- If I need to do that: do you have some example?

Thanks in advance!!

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Delete or hide Shape from Shapefile

2009-05-19T07:31:42Z

Fantastic, that fixed the crash.

Thanks again :)

Regards
Jelmer Baas

> -----Original Message-----
> From: shapelib-bounces@...
> [mailto:shapelib-bounces@...] On Behalf Of
> Frank Warmerdam
> Sent: dinsdag 19 mei 2009 15:49
> To: Shapelib Development
> Subject: Re: [Shapelib] Delete or hide Shape from Shapefile
>
> Jelmer Baas wrote:
> > The following code freezes my application:
> >
> > Dim intShapeFile As Integer, intEntities As Integer,
> objShapeType As
> > MapTools.ShapeLib.ShapeType
> > Dim minB(2) As Double, maxB(2) As Double
> >
> > intShapeFile = SHPOpen("C:\test\test.shp", "rb+")
> > SHPGetInfo(intShapeFile, intEntities, objShapeType, minB, maxB)
> > SHPClose(intShapeFile)
> > System.GC.Collect()
> >
> > I tried a different shape file, same problem. MapServer can properly
> > draw the shapes, so
> > I think it's a valid file, too. There's no way to recover
> except kill
> > the application.
> >
> >
> > Well, wouldn't you know. While typing this I had another
> idea: to skip
> > SHPGetInfo, and that
> > does the trick. Question remains: why does SHPGetInfo crash
> the app when
> > using Shapelib?
>
> Jelmer,
>
> The minB, maxB arguments to SHPGetInfo() should be
> dimensioned with a size
> of four (X, Y, Z, measure), not 2. I presume SHPGetInfo is
> writing past
> the end of your arrays and corrupting the heap.
>
> Best regards,
> --
> ---------------------------------------+----------------------
> ----------------
> I set the clouds in motion - turn up | Frank Warmerdam,
> warmerdam@...
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush | Geospatial
> Programmer for Rent
>
> _______________________________________________
> Shapelib mailing list
> Shapelib@...
> http://lists.maptools.org/mailman/listinfo/shapelib
>

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Delete or hide Shape from Shapefile

2009-05-19T06:49:07Z

Jelmer Baas wrote:

> The following code freezes my application:
>
> Dim intShapeFile As Integer, intEntities As Integer, objShapeType As
> MapTools.ShapeLib.ShapeType
> Dim minB(2) As Double, maxB(2) As Double
>
> intShapeFile = SHPOpen("C:\test\test.shp", "rb+")
> SHPGetInfo(intShapeFile, intEntities, objShapeType, minB, maxB)
> SHPClose(intShapeFile)
> System.GC.Collect()
>
> I tried a different shape file, same problem. MapServer can properly
> draw the shapes, so
> I think it's a valid file, too. There's no way to recover except kill
> the application.
>
>
> Well, wouldn't you know. While typing this I had another idea: to skip
> SHPGetInfo, and that
> does the trick. Question remains: why does SHPGetInfo crash the app when
> using Shapelib?

Jelmer,

The minB, maxB arguments to SHPGetInfo() should be dimensioned with a size
of four (X, Y, Z, measure), not 2. I presume SHPGetInfo is writing past
the end of your arrays and corrupting the heap.

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Delete or hide Shape from Shapefile

2009-05-19T04:41:31Z

Hi again,

Following my previous experiments with Shapelib, it seems I've found a
problem.

I can access the exisiting features, I can modify the shape type, the
vertices, etc. Shapelib also saves these changes properly. The problem
occurs
when VS.NET (Using Visual Studio 2005 now with David Gancarz's .NET
wrapper)
starts to clean up.

The following code freezes my application:

Dim intShapeFile As Integer, intEntities As Integer, objShapeType As
MapTools.ShapeLib.ShapeType
Dim minB(2) As Double, maxB(2) As Double

intShapeFile = SHPOpen("C:\test\test.shp", "rb+")
SHPGetInfo(intShapeFile, intEntities, objShapeType, minB, maxB)
SHPClose(intShapeFile)
System.GC.Collect()

I tried a different shape file, same problem. MapServer can properly
draw the shapes, so
I think it's a valid file, too. There's no way to recover except kill
the application.

Well, wouldn't you know. While typing this I had another idea: to skip
SHPGetInfo, and that
does the trick. Question remains: why does SHPGetInfo crash the app when
using Shapelib?

With kind regards,
Jelmer Baas

> Jelmer Baas wrote:
> > Hello,
> >
> > I'm looking for a way to remove or hide a shape in a shape file. I'm
> > using MapServer to draw it, so it needs to be supported by
> MapServer,
> > too.
> >
> > The PDF found on the shapelib page shows there's a shapetype 0 (Null
> > Shape), can't that somehow be used? Otherwise overwrite the style to
> > have a width of 0, something like that? I find it hard to
> believe that
> > ESRI apps rewrite the entire file when a single object is
> deleted...
> >
> > Despite already finding evidence that it's not possible
> >
> (http://lists.maptools.org/pipermail/shapelib/2004-May/000074.html), I
> > wanted to ask it nonetheless.
>
> Jelmer,
>
> The normal approach to this is to call DBFMarkRecordDeleted()
> which flips
> the bit in the DBF file marking a record as deleted.
> However, I see no
> evidence that the MapServer native shapefile code checks the deleted
> marker so this isn't likely to help you with MapServer.
>
> I think replacing the shape with a SHPT_NULL shape is the next best
> alternative.

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Delete or hide Shape from Shapefile

2009-05-12T07:49:52Z

> > Hello,
> >
> > I'm looking for a way to remove or hide a shape in a shape file. I'm
> > using MapServer to draw it, so it needs to be supported by
> MapServer,
> > too.
> >
> > The PDF found on the shapelib page shows there's a shapetype 0 (Null
> > Shape), can't that somehow be used? Otherwise overwrite the style to
> > have a width of 0, something like that? I find it hard to
> believe that
> > ESRI apps rewrite the entire file when a single object is
> deleted...
> >
> The normal approach to this is to call DBFMarkRecordDeleted()
> which flips
> the bit in the DBF file marking a record as deleted.
> However, I see no
> evidence that the MapServer native shapefile code checks the deleted
> marker so this isn't likely to help you with MapServer.
>
> I think replacing the shape with a SHPT_NULL shape is the next best
> alternative.

Frank,

Thank you for your quick reply. I tried setting the shpType to
NullShape, but this somehow doesn't seem to affect MapServer... I
verified the results and my modified shapefile is indeed different than
the original, and after re-loading the shpType is still 0. Setting the
vertices coordinates to zero *DID* have a result.

Seems like the only way to somehow mark an item for deletion is to move
it to 0,0 and every now and then build a new shapefile with these shapes
excluded.

If you have any other ideas, please let me know.

I'm happy at least the shapelib works in read/write mode. Thanks for all
your hard work.

--
Jelmer

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Delete or hide Shape from Shapefile

2009-05-12T07:03:26Z

Jelmer Baas wrote:

> Hello,
>
> I'm looking for a way to remove or hide a shape in a shape file. I'm
> using MapServer to draw it, so it needs to be supported by MapServer,
> too.
>
> The PDF found on the shapelib page shows there's a shapetype 0 (Null
> Shape), can't that somehow be used? Otherwise overwrite the style to
> have a width of 0, something like that? I find it hard to believe that
> ESRI apps rewrite the entire file when a single object is deleted...
>
> Despite already finding evidence that it's not possible
> (http://lists.maptools.org/pipermail/shapelib/2004-May/000074.html), I
> wanted to ask it nonetheless.

Jelmer,

The normal approach to this is to call DBFMarkRecordDeleted() which flips
the bit in the DBF file marking a record as deleted. However, I see no
evidence that the MapServer native shapefile code checks the deleted
marker so this isn't likely to help you with MapServer.

I think replacing the shape with a SHPT_NULL shape is the next best
alternative.

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Delete or hide Shape from Shapefile

2009-05-12T05:05:05Z

Hello,

I'm looking for a way to remove or hide a shape in a shape file. I'm
using MapServer to draw it, so it needs to be supported by MapServer,
too.

The PDF found on the shapelib page shows there's a shapetype 0 (Null
Shape), can't that somehow be used? Otherwise overwrite the style to
have a width of 0, something like that? I find it hard to believe that
ESRI apps rewrite the entire file when a single object is deleted...

Despite already finding evidence that it's not possible
(http://lists.maptools.org/pipermail/shapelib/2004-May/000074.html), I
wanted to ask it nonetheless.

Any help would be appreciated,

With kind regards,
Jelmer Baas
Speer IT B.V.
_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: SHPReadObject compile error

2009-04-30T05:47:40Z

Jamie Lahowetz wrote:
> I get this error when compiling:
> shape_test.c: In function ‘main’:
> shape_test.c:24: error: incompatible types in assignment
> shape_test.c:25: error: ‘SHPObject’ has no member named ‘nShapeid’
>
> Does this mean that the shapefile does not have an id or am I just doing
> it wrong?

Jamie,

The field name is "nShapeId" with a capital 'I'.

Best regards,

--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

SHPReadObject compile error

2009-04-29T23:59:03Z

I get this error when compiling:
shape_test.c: In function ‘main’:
shape_test.c:24: error: incompatible types in assignment
shape_test.c:25: error: ‘SHPObject’ has no member named ‘nShapeid’

Does this mean that the shapefile does not have an id or am I just doing it wrong?

#include <shapefil.h>

int main (void)
{
    const char * shapefile = "/mnt/share/uas/GRRUVI2_uc/extractor/colorado/fe_2007_08_county";
    SHPHandle handle;
    SHPObject *shpinforead;
    int entities;
    int type;
    double minbound[4];
    double maxbound[4];

    printf("Location: %s\n", shapefile);

    handle = SHPOpen(shapefile,"rb");
    SHPGetInfo( handle,&entities,&type,minbound,maxbound);

    printf("Entities: %d\n",entities);
    printf("Type: %d\n",type);
    for(int i=0;i<2;printf("Min Bound: %lf\nMax Bound: %lf\n",minbound[i],maxbound[i]), i++);

    int a=0;
    printf("\nReading Entity %d\n",a);
    shpinforead = *SHPReadObject(handle,a);
    printf("%d %d\n",shpinforead->nShapeid,shpinforead->nParts);

    SHPClose(handle);
    return 0;
}

--
Jamie Ryan Lahowetz
University of Nebraska - Lincoln
Graduate Student - Geosciences
402.304.0766
jlahowetz@...

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Shapelib test

2009-04-28T08:48:56Z

Jamie Lahowetz wrote:
> Thank you very much. It compiled. I would like to print the values of
> "entities", how do I do that?

Jamie,

printf("entities = %d\n", entities);

With all due respect, this is not shapelib specific, and I'd suggest
you spend some time with a C/C++ book and/or a programming mentor.

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Shapelib test

2009-04-27T22:01:30Z

Thank you very much. It compiled. I would like to print the values of "entities", how do I do that?

On Mon, Apr 27, 2009 at 10:21 PM, Frank Warmerdam <warmerdam@...> wrote:

Jamie Lahowetz wrote:
> I am learning C so humor me. I have a simple script but everytime I run
> it I get a segmentation fault. Any ideas?
>
> #include <shapefil.h>
>
> int main (void)
> {
> const char * shapefile = "/mnt/share/uas/GRRUVI2_uc/
> extractor/colorado/fe_2007_08_county";
> SHPHandle handle;
> int entities;
> int type;
> double minbound;
> double maxbound;
>
> printf("%s\n", shapefile);
>
> handle = SHPOpen(shapefile,"rb");
> SHPGetInfo( handle,&entities,&type,&minbound,&maxbound);
>
> SHPClose(handle);
> return 0;
> }

Jamie,

The minbound and maxbound arguments need to be pointers to an array of
four values (for the four dimensions possible in a shapefile).

So more like:

...
double minbound[4];
double maxbound[4];

printf("%s\n", shapefile);

handle = SHPOpen(shapefile,"rb");
SHPGetInfo( handle,&entities,&type,minbound,maxbound);

...

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

--
Jamie Ryan Lahowetz
University of Nebraska - Lincoln
Graduate Student - Geosciences
402.304.0766
jlahowetz@...

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib

Re: Shapelib test

2009-04-27T21:58:50Z

Thank you very much. It compiled. I would like to print the values of "entities", how do I do that?

On Mon, Apr 27, 2009 at 10:21 PM, Frank Warmerdam <warmerdam@...> wrote:

Jamie Lahowetz wrote:
> I am learning C so humor me. I have a simple script but everytime I run
> it I get a segmentation fault. Any ideas?
>
> #include <shapefil.h>
>
> int main (void)
> {
> const char * shapefile = "/mnt/share/uas/GRRUVI2_uc/
> extractor/colorado/fe_2007_08_county";
> SHPHandle handle;
> int entities;
> int type;
> double minbound;
> double maxbound;
>
> printf("%s\n", shapefile);
>
> handle = SHPOpen(shapefile,"rb");
> SHPGetInfo( handle,&entities,&type,&minbound,&maxbound);
>
> SHPClose(handle);
> return 0;
> }

Jamie,

The minbound and maxbound arguments need to be pointers to an array of
four values (for the four dimensions possible in a shapefile).

So more like:

...
double minbound[4];
double maxbound[4];

printf("%s\n", shapefile);

handle = SHPOpen(shapefile,"rb");
SHPGetInfo( handle,&entities,&type,minbound,maxbound);

...

Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@...
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent

_______________________________________________
Shapelib mailing list
Shapelib@...
http://lists.maptools.org/mailman/listinfo/shapelib