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POWhat is the difference between structures containing bool vs uint when using PInvoke?
 

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  1. POWhat is the difference between structures containing bool vs uint when using PInvoke?
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    <p>Ok, I'm now very confused. <a href="https://stackoverflow.com/questions/1602487">After my last question</a> had several people comment about changing bool to uint I verified they are the same size by:</p> <pre><code> Console.WriteLine("sizeof bool = {0}", Marshal.SizeOf(typeof(bool))); Console.WriteLine("sizeof uint = {0}", Marshal.SizeOf(typeof(uint))); </code></pre> <p>Which of course prints:</p> <pre><code>sizeof bool = 4 sizeof uint = 4 </code></pre> <p>That said, I then broke down and gave their suggestions a try anyway... Changing a single bool inside a structure to a uint. What I can't figure out for the life of me is why this made it work...</p> <p>So this works:</p> <pre><code>[StructLayout(LayoutKind.Sequential)] public struct KEY_EVENT_RECORD { public bool bKeyDown; public short wRepeatCount; public short wVirtualKeyCode; public short wVirtualScanCode; public char UnicodeChar; public int dwControlKeyState; } </code></pre> <p>When used in this structure:</p> <pre><code>[StructLayout(LayoutKind.Explicit)] public struct INPUT_RECORD { [FieldOffset(0)] public short EventType; [FieldOffset(4)] public KEY_EVENT_RECORD KeyEvent; } </code></pre> <p>But in this structure it breaks:</p> <pre><code>[StructLayout(LayoutKind.Explicit)] public struct INPUT_RECORD { [FieldOffset(0)] public short EventType; [FieldOffset(4)] public KEY_EVENT_RECORD KeyEvent; [FieldOffset(4)] public MOUSE_EVENT_RECORD MouseEvent; [FieldOffset(4)] public WINDOW_BUFFER_SIZE_RECORD WindowBufferSizeEvent; [FieldOffset(4)] public MENU_EVENT_RECORD MenuEvent; [FieldOffset(4)] public FOCUS_EVENT_RECORD FocusEvent; } </code></pre> <p>Yet when I change bool bKeyDown to uint in the <code>KEY_EVENT_RECORD</code> structure it starts working again... </p> <p><strong>Can someone please explain this behavior?</strong></p> <p>I really would like to know the why of it so that I can avoid this undocumented feature (aka bug) in the future.</p>
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