[gdal-dev] Need help if OGR C-API (Resolved)

[Stephen Woodbridge]

Thank you, still learning my way around things.

So after copying 90% of the my not working source code into the test 
program and it worked there, it finally dawned on me to check the 
Makefile. Duh! while I had removed all the shapelib calls from the 
source code, I forgot to check the link line to remove adding -lshp 
which apparently was causing the bogus behavior. Cleaned that up and 
things started working as expected.

Thanks for all the help guys. It is very much appreciated.

-Steve

On 9/3/2010 2:20 PM, Even Rouault wrote:
> Stephen
>
> did you read :
> http://gdal.org/ogr/ogr__api_8h.html#7b67ea4ab5892c6720460dc7f66eca2d ?
>
> You'll know the cause of the crash afterwards ;-)
>
> Le vendredi 03 septembre 2010 20:12:51, Stephen Woodbridge a écrit :
>> Even,
>>
>> Here is my test program:
>>
>> $ cat testogr.c
>> #include "ogr_api.h"
>>
>> int main() {
>>       OGRDataSourceH hDSin;
>>       OGRLayerH hLayerIn;
>>       OGRFeatureDefnH hFDefnIn;
>>       OGRwkbGeometryType layerGeomType;
>>
>>       OGRRegisterAll();
>>
>>       hDSin = OGROpen( "/u/data/routeloops-v2/25/25017/Streets.shp",
>> FALSE, NULL );
>>       hLayerIn = OGR_DS_GetLayerByName( hDSin, "Streets" );
>>
>>       hFDefnIn = OGR_L_GetLayerDefn( hLayerIn );
>>       layerGeomType = OGR_FD_GetGeomType( hFDefnIn );
>>       printf("GeometryType: %s\n", OGRGeometryTypeToName( layerGeomType ));
>>
>>       OGR_FD_Release( hFDefnIn );
>>       OGR_DS_Destroy( hDSin );
>> }
>>
>> $ gcc -g -o testogr testogr.c  -I/usr/local/include/gdal -lgdal -lm
>>
>> It reports GeometryType correctly and then segvs :(
>>
>> woodbri at mappy:~/work$ gdb ./testogr
>> GNU gdb 6.8-debian
>> Copyright (C) 2008 Free Software Foundation, Inc.
>> License GPLv3+: GNU GPL version 3 or later
>> <http://gnu.org/licenses/gpl.html>
>> This is free software: you are free to change and redistribute it.
>> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
>> and "show warranty" for details.
>> This GDB was configured as "x86_64-linux-gnu"...
>> (gdb) run
>> Starting program: /home/woodbri/work/testogr
>> [Thread debugging using libthread_db enabled]
>> warning: Lowest section in /usr/lib/libicudata.so.38 is .hash at
>> 0000000000000120
>> GeometryType: Line String
>> [New Thread 0x7f361a0bc710 (LWP 30585)]
>>
>> Program received signal SIGSEGV, Segmentation fault.
>> [Switching to Thread 0x7f361a0bc710 (LWP 30585)]
>> 0x0000000000000031 in ?? ()
>> (gdb) bt
>> #0  0x0000000000000031 in ?? ()
>> #1  0x00007f3619a2f190 in ~OGRShapeLayer (this=0x605a40)
>>       at ogrshapelayer.cpp:105
>> #2  0x00007f3619a2c63f in ~OGRShapeDataSource (this=0x604330)
>>       at ogrshapedatasource.cpp:62
>> #3  0x0000000000400958 in main () at testogr.c:19