[gdal-dev] C# bindings - CreateCopy() progress delegate fails for WMS

[Maksim Sestic]

Hi all,

I'm experiencing issues while setting a progress delegate on CreateCopy()
for WMS driver. Here's the example:

Dim ds_in As Dataset = Gdal.Open("<GDAL_WMS><Service
name="WMS"><Version>1.3.0</Version><ServerUrl>http://wms.agiv.be/inspire/wms/orthobeeldvorming</ServerUrl><CRS>CRS:84</CRS><ImageFormat>image/png</ImageFormat><Transparent>True</Transparent><Layers>RGB</Layers><Styles></Styles></Service><DataWindow><UpperLeftX>3.76302095985856</UpperLeftX><UpperLeftY>50.9987228424621</UpperLeftY><LowerRightX>3.76629196690679</LowerRightX><LowerRightY>50.9968195506639</LowerRightY><SizeX>2439</SizeX><SizeY>2255</SizeY></DataWindow><Projection>EPSG:4326</Projection></GDAL_WMS>",
Access.GA_ReadOnly) 
...
Dim ds_out As Dataset = drv.CreateCopy("C:\Test.png", ds_in, 0, Nothing, New
Gdal.GDALProgressFuncDelegate(AddressOf ProgressFunc), "")

There's also callback function reporting progress:

Private Function ProgressFunc(Complete As Double, Message As System.IntPtr,
Data As System.IntPtr) As Integer
            MsgBox(Complete.ToString)
End Function

Above example fails with "libpng: No IDATs written into file" exception. 

But, if there's no callback function set:

ds_out = drv.CreateCopy("C:\Test.png", ds_in, 0, Nothing, Nothing, Nothing)

...everything works fine. What am I doing wrong here?

Regards,
Maksim Sestic

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