Thanks for the reply. I was wonder what the deal is with the other
warnings:
#include "ogr_api.h"
#include "ogr_srs_api.h"
int main()
{
//~ variable declaration
const char *format = "ESRI Shapefile", *name = "testc.shp", *source,
*target;
const char *sprj = "+proj=lcc +lat_1=33.000000 +lat_2=45.000000
+lat_0=39.000000 +lon_0=-96.000000 +x_0=0.0 +y_0=0.0 +datum=NAD83";
const char *tprj = "WGS84";
OGRSFDriverH driver;
OGRDataSourceH ds;
OGRCoordinateTransformationH ctrans;
//~ get driver and create ds
driver = OGRGetDriverByName(format);
ds = OGR_Dr_CreateDataSource(driver, "testc.shp", NULL);
//~ create spatrefs and trans
OSRNewSpatialReference(source);
OSRNewSpatialReference(target);
OSRSetFromUserInput(source, sprj);
OSRSetFromUserInput(target, tprj);
ctrans = OCTNewCoordinateTransformation(target, source);
}
dal_test_convert.c: In function ‘main’:
gdal_test_convert.c:22: warning: passing argument 1 of â
€˜OSRSetFromUserInput’ discards qualifiers from pointer target type
gdal_test_convert.c:23: warning: passing argument 1 of â
€˜OSRSetFromUserInput’ discards qualifiers from pointer target type
gdal_test_convert.c:24: warning: passing argument 1 of â
€˜OCTNewCoordinateTransformation’ discards qualifiers from pointer
target type
gdal_test_convert.c:24: warning: passing argument 2 of â
€˜OCTNewCoordinateTransformation’ discards qualifiers from pointer
target type
On Mar 2, 10:48 pm, brian <r...@winkey.org> wrote:
> deadpickle,
>
> The types in the OGR C api pretty much end in H.
>
> OGRCoordinateTransformation ctrans;
> should read
> OGRCoordinateTransformationH ctrans;
>
> The function your looking for is OCTNewCoordinateTransformation().
>
> Brian
>
>
>
> On Tue, 2010-03-02 at 19:22 -0800, deadpickle wrote:
> > I'm trying to write a simple C program that creates and populates a
> > shapefile (have one done in python). I'm very new to C and GDAL both
> > and could use some help. I'm trying to apply coordinatetransformation
> > to my points but first I have to create the coordinatetransformation.
> > In python I can do this simply by:
> > coordtrans = osr.CoordinateTransformation(target, source)
> > but in C I cant seem to find the right call for this. Any ideas?
>
> > #include "ogr_api.h"
> > #include "ogr_srs_api.h"
>
> > int main()
> > {
> > //~ variable declaration
> > const char *format = "ESRI Shapefile", *name = "testc.shp", *source,
> > *target;
> > const char *sprj = "+proj=lcc +lat_1=33.000000 +lat_2=45.000000
> > +lat_0=39.000000 +lon_0=-96.000000 +x_0=0.0 +y_0=0.0 +datum=NAD83";
> > const char *tprj = "WGS84";
> > OGRSFDriverH driver;
> > OGRDataSourceH ds;
> > OGRCoordinateTransformation ctrans;
>
> > //~ get driver and create ds
> > OGRRegisterAll();
> > driver = OGRGetDriverByName(format);
> > ds = OGR_Dr_CreateDataSource(driver, "testc.shp", NULL);
>
> > //~ create spatrefs and trans
> > OSRNewSpatialReference(source);
> > OSRNewSpatialReference(target);
> > OSRSetFromUserInput(source, sprj);
> > OSRSetFromUserInput(target, tprj);
> > ctrans = OGRCreateCoordinateTransformation(target, source);
> > }
>
> > [t...@updraft ~/Programs]$ gcc -o gdal_test_convert
> > gdal_test_convert.c
> > gdal_test_convert.c: In function main :
> > gdal_test_convert.c:12: error: OGRCoordinateTransformation
> > undeclared (first use in this function)
> > gdal_test_convert.c:12: error: (Each undeclared identifier is reported
> > only once
> > gdal_test_convert.c:12: error: for each function it appears in.)
> > gdal_test_convert.c:12: error: expected ; before ctrans
> > gdal_test_convert.c:22: warning: passing argument 1 of
> > OSRSetFromUserInput discards qualifiers from pointer target type
> > gdal_test_convert.c:23: warning: passing argument 1 of
> > OSRSetFromUserInput discards qualifiers from pointer target type
> > gdal_test_convert.c:24: error: ctrans undeclared (first use in
> > this function)
>
> > _______________________________________________
> > gdal-dev mailing list
> > gdal-...@lists.osgeo.org
> >http://lists.osgeo.org/mailman/listinfo/gdal-dev
>
> _______________________________________________
> gdal-dev mailing list
> gdal-...@lists.osgeo.orghttp://lists.osgeo.org/mailman/listinfo/gdal-dev
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