c# - 从另一个应用程序获取 Button 句柄

Question

我有一个程序需要将 BM_CLICK 消息发送到另一个应用程序按钮。我可以获得父窗口句柄但是当我尝试获取按钮句柄时如果总是返回 0

我从 Spy++ 获得了按钮标题名称和按钮类型，这似乎是正确的，但我知道我一定是弄错了。下面是我的代码

 public const Int BM_CLICK = 0x00F5;

 [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SendMessage(IntPtr hwnd, uint Msg, IntPtr wParam, IntPtr lParam);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);



private void button1_Click(object sender, EventArgs e)
{
    Process[] processes = Process.GetProcessesByName("QSXer");

    foreach (Process p in processes)
    {
        ////the Button's Caption is "Send" and it is a "Button".  
        IntPtr ButtonHandle = FindWindowEx(p.MainWindowHandle, IntPtr.Zero, "Button", "Send");
       //ButtonHandle is always zero thats where I think the problem is 
    SendMessage(ButtonHandle, BM_CLICK, IntPtr.Zero, IntPtr.Zero);

    }

}

spy 屏幕截图

Answer 1

尝试为窗口文本传递 null 而不是尝试查找任何按钮:

IntPtr ButtonHandle = FindWindowEx(p.MainWindowHandle, IntPtr.Zero, "Button", null);

之后，您可以使用第二个参数和一个新的调用来多次获取下一个按钮句柄。

您还可以尝试检查 Marshal.GetLastWin32Error 以查看错误结果是什么吗？