Should be use C.CPLFree to release some pointer malloced by GDAL it self.

[ningfc]

I got an exception when debug with function ToWKT,
// Fetch geometry as WKT func (geom Geometry) ToWKT() (string, error) { var p *C.char err := C.OGR_G_ExportToWkt(geom.cval, &p).Err() wkt := C.GoString(p) defer C.free(unsafe.Pointer(p)) // <--- Exception at this line return wkt, err }

I think this pointer should be release by use CPLFree. And I try to change C.free to C.CPLFree, it works.

[lukeroth]

Updated this function and others that free pointers allocated by the OGR library.