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Use Lambda Expressions as Unmanaged Callbacks

, 5 Nov 2010 CPOL
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// Even more simplifiedclass Program{ [DllImport("user32", ExactSpelling = true)] static extern bool EnumWindows(WNDENUMPROC lpEnumFunc, IntPtr lParam); [UnmanagedFunctionPointer(CallingConvention.Winapi)] delegate bool WNDENUMPROC(IntPtr hwnd, IntPtr lParam); ...
// Even more simplified
class Program
{
    [DllImport("user32", ExactSpelling = true)]
    static extern bool EnumWindows(WNDENUMPROC lpEnumFunc, IntPtr lParam);
 
    [UnmanagedFunctionPointer(CallingConvention.Winapi)]
    delegate bool WNDENUMPROC(IntPtr hwnd, IntPtr lParam);
 
    static void Main(string[] args)
    {
        List<IntPtr> windows = new List<IntPtr>();
        EnumWindows((hwnd, lParam) =>
        {
            windows.Add(hwnd);
            return true;
        }, IntPtr.Zero);
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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codefabricator

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