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

[raphael_mws]

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

[Sanak]

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
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[raphael_mws]

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 <[e-mail]>

>
> 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
> [e-mail]
> http://lists.maptools.org/mailman/listinfo/shapelib
>

_______________________________________________
Shapelib mailing list
[e-mail]
http://lists.maptools.org/mailman/listinfo/shapelib

[Sanak]

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

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

[raphael_mws]

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.