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POgdi32.GetObject doesn't work when running 64-bit
 

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  1. POgdi32.GetObject doesn't work when running 64-bit
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    <p>This code works fine when running 32-bit. But when I switch to 64-bit the <code>GetObject</code> method does not work and <code>BITMAP</code> struct is empty. </p> <pre><code>IntPtr hBmp = ObtainValidBitmapHandleFromSystem(); BITMAP bmpData = new BITMAP(); /* BITMAP consists of four 32bit ints, * two 16 bit uints and one IntPtr */ * 4 + sizeof(UInt16) * 2 + IntPtr.Size; int cbBuffer = sizeof(Int32) * 4 + sizeof(UInt16) * 2 + IntPtr.Size; NativeMethods.GetObject(hBmp, cbBuffer, out bmpData); Bitmap bmp = new Bitmap(bmpData.Width, bmpData.Height, PixelFormat.Format32bppPArgb); </code></pre> <p>The native method implementation:</p> <pre><code>private static class NativeMethods { [DllImport("gdi32", CharSet = CharSet.Auto)] internal extern static int GetObject( IntPtr hgdiobj, // handle to graphics object int cbBuffer, // size of buffer for object information out BITMAP lpvObject // Should be IntPtr, but we know we will use it only for BITMAP. ); } </code></pre> <p>The BITMAP structure implementation (removed documentation to keep code compact):</p> <pre><code>[StructLayoutAttribute(LayoutKind.Sequential)] private struct BITMAP { public Int32 Type; public Int32 Width; public Int32 Height; public Int32 WidthBytes; public UInt16 Planes; public UInt16 BitsPixel; public IntPtr Bits; } </code></pre> <p>The idea behind this code is fully described in this <a href="https://stackoverflow.com/questions/4627376/use-native-hbitmap-in-c-sharp-while-preserving-alpha-channel-transparency">question</a>.</p> <p>At first I thought that the issue is caused by different size of <code>IntPtr</code> resulting in different size of <code>cbBuffer</code>, but it seems that this is not the case as changing <code>cbBuffer</code> size did not help.</p> <p>What is the correct way to use GDI's <code>GetObject</code> method on 64-bit system?</p>
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    1. USSiliconMind
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    1. COHow does NativeMethods look like ?
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      1. USTigran
    2. CO@Tigran I've edited my question to include part of the `NativeMethods` class.
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    3. COWhat do you mean by "does not work"? Isn't there any exception?
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      1. USKing King
 

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