"Input array is not a valid rank" error message when using CopyPIxels method

Question

[StructLayout(LayoutKind.Sequential)]
public struct PixelColor
{
 public byte Blue;
 public byte Green;
 public byte Red;
 public byte Alpha;
}

public PixelColor[,] GetPixels(BitmapSource source)
{
 if(source.PixelFormat!=PixelFormats.Bgra32)
 source = new FormatConvertedBitmap(source, PixelFormats.Bgra32, null, 0);

 int width = source.PixelWidth;
 int height = source.PixelHeight;
 PixelColor[,] result = new PixelColor[width, height];

 source.CopyPixels(result, width * 4, 0);
 return pixels;
}

I get this error message Input array is not a valid rank. Parameter name: pixels on this line source.CopyPixels(result, width * 4, 0);

Does anyone know what the problem is?

кто нибуть знать в чем причина -- Anybody know what the problem is — Yuriy Faktorovich, Aug 05 '10 at 19:40
Probably a continuation of this: http://stackoverflow.com/questions/1176910/finding-specific-pixel-colors-of-a-bitmapimage/3391080#3391080 — Brandon, Aug 05 '10 at 19:40
I don't see how this isn't a real question. He's posted the code and said what error he got. — Andrew Shepherd, Aug 05 '10 at 21:34
@Andrew, Agreed. There was no reason to close this question after it had been cleaned up. — Brandon, Aug 05 '10 at 21:41
OK, looking at the revision history I can see why it was closed. But thanks to a heroic effort of editing this has turned into a useful question. — Andrew Shepherd, Aug 05 '10 at 22:04

score 3 · Answer 1 · answered Aug 05 '10 at 19:46

BitmapSource.CopyPixels expects a one-dimensional array as the first parameter. You are passing it a two-dimensional array.

Instead of actually providing a "rectangular" array of bits, CopyPixels apparently gives you a single continuous array of them - the "stride" specifies the width of one scanline of the bitmap, which means - if I understand this correctly - that given a stride of n bits, the second row of the bitmap begins at bit n + 1

See this link for an explanation of stride: http://www.tech-archive.net/Archive/DotNet/microsoft.public.dotnet.framework.drawing/2006-09/msg00057.html

"Input array is not a valid rank" error message when using CopyPIxels method

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