> GDAL_GCP CPL_DLL * > GDALComputeMatchingPoints( GDALRasterBandH hFirstBand, > double dfMinFirstBand, double dfMaxFirstBand, > GDALDatasetH hSecondImage, > double dfMinSecondBand, double dfMaxSecondBand, > char **papszOptions, > int *pnGCPCount ) I of course meant GDALRasterBandH hSecondBand in the above signature.