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Shapelib test
by Jamie Lahowetz
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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 Ryan Lahowetz University of Nebraska - Lincoln Graduate Student - Geosciences 402.304.0766 jlahowetz@... _______________________________________________ Shapelib mailing list Shapelib@... http://lists.maptools.org/mailman/listinfo/shapelib |
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Re: Shapelib test
by Frank Warmerdam-2
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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 |
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Re: Shapelib test
by Jamie Lahowetz-3
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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 Ryan Lahowetz University of Nebraska - Lincoln Graduate Student - Geosciences 402.304.0766 jlahowetz@... _______________________________________________ Shapelib mailing list Shapelib@... http://lists.maptools.org/mailman/listinfo/shapelib |
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Re: Shapelib test
by Jamie Lahowetz
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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 Ryan Lahowetz University of Nebraska - Lincoln Graduate Student - Geosciences 402.304.0766 jlahowetz@... _______________________________________________ Shapelib mailing list Shapelib@... http://lists.maptools.org/mailman/listinfo/shapelib |
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Re: Shapelib test
by Frank Warmerdam-2
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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 |
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