用于检测最小化窗口的钩子 C#

Question

大家好 在C#中如何检测用户单击了外部程序（例如记事本）的最小化按钮？ 谢谢

Answer 1

这应该有效：

    public class myClass
    {
    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);

    const UInt32 SW_HIDE =         0;
    const UInt32 SW_SHOWNORMAL =       1;
    const UInt32 SW_NORMAL =       1;
    const UInt32 SW_SHOWMINIMIZED =    2;
    const UInt32 SW_SHOWMAXIMIZED =    3;
    const UInt32 SW_MAXIMIZE =     3;
    const UInt32 SW_SHOWNOACTIVATE =   4;
    const UInt32 SW_SHOW =         5;
    const UInt32 SW_MINIMIZE =     6;
    const UInt32 SW_SHOWMINNOACTIVE =  7;
    const UInt32 SW_SHOWNA =       8;
    const UInt32 SW_RESTORE =      9;

    public myClass()
    {
        var proc = Process.GetProcessesByName("notepad");
        if (proc.Length > 0)
        {
            bool isNotepadMinimized = myClass.GetMinimized(proc[0].MainWindowHandle);

            if (isNotepadMinimized)
                Console.WriteLine("Notepad is Minimized!");
        }
    }

    private struct WINDOWPLACEMENT
    {
        public int length;
        public int flags;
        public int showCmd;
        public System.Drawing.Point ptMinPosition;
        public System.Drawing.Point ptMaxPosition;
        public System.Drawing.Rectangle rcNormalPosition;
    }

    public static bool GetMinimized(IntPtr handle)
    {
        WINDOWPLACEMENT placement = new WINDOWPLACEMENT();
        placement.length = Marshal.SizeOf(placement);
        GetWindowPlacement(handle, ref placement);
        return placement.flags == SW_SHOWMINIMIZED;
    }
}

编辑：只需重新阅读您的问题，并注意到您希望在记事本最小化时收到通知。那么您可以在计时器中使用上面的代码来轮询状态更改。

Answer 2

正如汉斯·帕桑特（Hans Passant）所说，你无法将其最小化。

不过，我相信您可以存储窗口的状态，并在稍后查看它们是否最小化。
通过使用 GetWindowPlacement 函数。

Answer 3

上面的答案有一个错误。

您需要检查 placement.showCMD，而不是 placement.flags

WINDOWPLACEMENT placement = new WINDOWPLACEMENT();
placement.length = Marshal.SizeOf(placement);
GetWindowPlacement(_hwnd, ref placement);
return placement.showCmd == SW_SHOWMINIMIZED;

请参阅https://msdn.microsoft.com/en-us/library/windows/desktop/ms632611(v=vs.85)。 ASPX