[gdal-dev] Driver pointer NULL

[deadpickle]

I have finally compiled my C program and tried running it for the
first time. When I ran the file I got the error:
[t...@updraft ~/Programs]$ ./gdal_test_convert
ERROR 10: Pointer 'hDriver' is NULL in 'OGR_Dr_CreateDataSource'.
I'm trying to load the ESRI Shapefile driver. When I compiled it I
linked it to the libgdal.a library. Is there something I'm missing?

#include "ogr_api.h"
#include "ogr_srs_api.h"
#include "stdio.h"

int main()
{
        //~ variable declaration
        const char *name = "testc.shp", *dir = "C:\\Users\\deadpickle\\Desktop
\\case study\\verify\\";
        char *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";
        char c[100];
        OGRSFDriverH driver;
        OGRDataSourceH ds;
        OGRCoordinateTransformationH ctrans;
        OGRLayerH layer;
        OGRFieldDefnH fieldDefn;
        OGRGeometryH line;
        OGRFeatureDefnH featureDefn;
        OGRFeatureH feature;
        FILE *file;

        //~ working directory
        chdir(dir);

        //~ get driver and create ds
        driver = OGRGetDriverByName("ESRI Shapefile");
        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);

        //~ create the layer
        layer = OGR_DS_CreateLayer(ds, "test", source, wkbMultiLineString,
NULL);

        //~ add an id field
        fieldDefn = OGR_Fld_Create("id", OFTInteger);
        OGR_L_CreateField(layer, fieldDefn, FALSE);

        //~ create geometry
        line = OGR_G_CreateGeometry(wkbMultiLineString);

        //~ layer def and create feature
        featureDefn = OGR_L_GetLayerDefn(layer);
        feature = OGR_F_Create(featureDefn);

        //~ open file
        file = fopen("2006track.csv","r");

        if(file==NULL) {
                printf("Error: can't open file.\n");
                /* fclose(file); DON'T PASS A NULL POINTER TO fclose !! */
                return 1;
        }
        else {
                printf("File opened successfully. Contents:\n\n");

                while(fgets(c, 100, file)!=NULL) {
                        /* keep looping until NULL pointer... */
                        printf("String: %s", c);
                        /* print the file one line at a time  */
                }

                printf("\n\nNow closing file...\n");
        }

        //~ close file
        fclose(file);
}
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