[gdal-dev] How to use wrapper_GDALWarpDestName in C#

[Paul Meems]

Hi List,

I'm now trying to use GDALWarp with the C# bindings.
I'm using GDAL v2.

Together with a colleague we came up with this snippet:
using (var ds = Gdal.Open(input, Access.GA_ReadOnly))
{
    if (ds == null)
    {
        throw new Exception("Can't open GDAL dataset: " + input);
    }

    var gdalOptions = new GDALWarpAppOptions(options);
    var ptr = new[] { Dataset.getCPtr(ds).Handle };
    var gcHandle = GCHandle.Alloc(ptr, GCHandleType.Pinned);
    try
    {
        var dss = new
SWIGTYPE_p_p_GDALDatasetShadow(gcHandle.AddrOfPinnedObject(), false, null);
        var newDs = Gdal.wrapper_GDALWarpDestName(output, 1, dss,
gdalOptions, null, null);
        if (newDs == null)
        {
            throw new Exception("GdalWarp failed: " +
Gdal.GetLastErrorMsg());
        }
    }
    finally
    {
        if (gcHandle.IsAllocated)
            gcHandle.Free();
    }

    return true;
}

It seems to work, but the SWIGTYPE_p_p_GDALDatasetShadow and gcHandle feel
a bit hacky.
Is this the recommended flow?
And the second parameter is object_list_count. We now put in 1, but what
should this be?

Thanks,

Paul

*Paul Meems *
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