topic IRasterBand.ComputeStatsAndHist() .. Attempted to read or write protected memory in ArcObjects SDK Questions

IRasterBand.ComputeStatsAndHist() .. Attempted to read or write protected memory

martinmaretta — Tue, 19 Nov 2013 11:36:04 GMT

Hi I have one very strange error when i try compute statistics for my Raster (only happens whit FGDB Raster). It happens when i overwrite raster (when i create new raster everything is OK). Any Ideas? thanks

            Dim pRasterCol As IRasterBandCollection
            pRasterCol = pRaster
            Dim pBand As IRasterBand
            pBand = pRasterCol.Item(0)
            pBand.ComputeStatsAndHist() 'ERROR

ERROR = "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

I create raster like this>

Dim copyRaster As ESRI.ArcGIS.DataManagementTools.CopyRaster = New ESRI.ArcGIS.DataManagementTools.CopyRaster()
            Dim gp As ESRI.ArcGIS.Geoprocessor.Geoprocessor = New ESRI.ArcGIS.Geoprocessor.Geoprocessor
            gp.OverwriteOutput = True
            gp.AddOutputsToMap = False

            copyRaster.in_raster = pRaster
            copyRaster.out_rasterdataset = pOutputPath
            copyRaster.nodata_value = -9999
            copyRaster.pixel_type = "32_BIT_FLOAT"

            gp.Execute(copyRaster, Nothing)
            gp = Nothing
            copyRaster = Nothing

Re: IRasterBand.ComputeStatsAndHist() .. Attempted to read or write protected memory

ParitoshGupta — Tue, 19 Nov 2013 19:34:24 GMT

Hi Martin
This common error is related to the object memory not being released. The pRaster object memory should be released before attempting to compute statistics using it. You can use System.Runtime.InteropServices.Marshal.ReleaseCOMObject method to do it.

Re: IRasterBand.ComputeStatsAndHist() .. Attempted to read or write protected memory

martinmaretta — Wed, 20 Nov 2013 11:28:16 GMT

Thanks a lot

Re: IRasterBand.ComputeStatsAndHist() .. Attempted to read or write protected memory

ParitoshGupta — Mon, 25 Nov 2013 18:56:45 GMT

Hi Martin
Request you to vote my reply up by clicking on ^ key.

Regards