Hello GDAL devs, I am a GDAL rookie, and I am trying to add WMS support to an existing GDAL (2.2.4) implementation.
I saw in this example: https://gis.stackexchange.com/questions/67416/using-gdal-to-connect-to-a-wfs that its possible to provide OGRSFDriverRegistrar::Open(sURL, FALSE ); with a url and use it to open an OGRDataSource. And in other examples I see that OGRSFDriverRegistrar::Open() has been deprecated and that GDALOpen() should be used instead. So I did that, adding cURL to our GDAL build, and then in my implementation, I provided GDALOpen() with a URL like this: GDALDataset *pDataset = (GDALDataset*)::GDALOpen(sURL, GA_ReadOnly); if( pDataset ) { int nLayers = pDataset->GetLayerCount(); OGRLayer *pLayer = pDataset->GetLayerByName(sLayerName); } This seems to partially work, in the sense that the GDALOpen function returns a non-NULL pointer to a GDALDataset, but when I try to call the member functions of the resulting GDALDataset, everything seems to return zeros or nulls; The above call returns nLayers = 0, and pLayer=NULL but if I feed the same sURL into my web browser (Chrome), the browser receives a properly formatted xml file that clearly has <Layer>(s) defined in it. What am I missing? Why am I unable to retrieve useful data from the dataset? Ming
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