I have the following method for writing pixel edits to a raster:
private void RectangularRasterEdit(IRaster raster, IPnt topLeft, int widthInCells, int heightInCells, List<int> newPixelValues)
{
//rasterband
//IRasterBand rasterBand = ((IRasterBandCollection)raster).Item(0);
//pixel block size
IPnt blockSize = new PntClass();
blockSize.X = widthInCells;
blockSize.Y = heightInCells;
//create pixel block
//IPixelBlock pixelBlock = ((IRawPixels)rasterBand).CreatePixelBlock(blockSize);
IPixelBlock pixelBlock = raster.CreatePixelBlock(blockSize);
//build array of new values to be written to raster
short[,] pixels = new short[widthInCells, heightInCells];
int newValueIndex = 0;
for (int i = 0; i < widthInCells; i++)
{
for (int j = 0; j < heightInCells; j++)
{
pixels[i, j] = (short)newPixelValues[newValueIndex];
newValueIndex++;
}
}
//update pixel block with new pixel array
((IPixelBlock3)pixelBlock).set_PixelData(0, pixels);
//write changed pixelblock to raster
//((IRawPixels)rasterBand).Write(topLeft, pixelBlock);
((IRasterEdit)raster).Write(topLeft, pixelBlock);
((IRasterEdit)raster).Refresh();
}
This method can handle rectangles of any size, but I use it mostly for one-cell edits (pixelBlock is 1 X 1). The problem is that when I try to edit a cell in the rightmost column or in the bottom row of the raster, the IRasterEdit.Write method fails (with a generic HRESULT). I have tried the IRawPixels.Write method as well (the code for that is in comments above), but get the same error. For example, say I have a raster that is 6 pixels by 6 pixels. If I pass a 1X1 pixelBlock to the write method, and the top left corner contains a 5 for either the row or column, it fails.Also, after some testing, I verified that there is no problem reading a 1X1 pixel block using the same top left corner. The problem only occurs when trying to write.Any ideas what might be causing this issue?
