Question

I have a program that needs to send the BM_CLICK message to another applications button. I can get the parent window handle but when I try to get the button handle if always returns 0

我从Spy++处拿到纽托语和纽托语,这似乎正确,但我知道,我必须夸大一些错误。我的法典如下:

 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);

    }

}

注射器

“alt

Answer 1

3. 试图将窗户的字句倒掉,而是试图找到任何 but子:

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

之后,你可以使用第二个参数,并发出新的呼吁,使下顿能够处理好两倍。

另外,请查看<代码>Marshal.Get LastWin32Error,以了解错误的结果是什么?

Answer 2

为此:

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

Answer 3

你可以这样做:

//Program finds a window and looks for button in window and clicks it

HWND buttonHandle = 0;

BOOL CALLBACK GetButtonHandle(HWND handle, LPARAM)
{
    char label[100];
    int size = GetWindowTextA(handle, label, sizeof(label));
    if (strcmp(label, "Send") == 0) // your button name
    {
        buttonHandle = handle;
        cout << "button id is: " << handle << endl;
        return false;
    }
    return true;
}

int main()

{
    HWND windowHandle = FindWindowA(NULL, "**Your Window Name**");

    if (windowHandle == NULL)
    {
        cout << "app isn t open." << endl;
    }

    else
    {
        cout << "app is open :) " << endl;
        cout << "ID is: " << windowHandle << endl;
        SetForegroundWindow(windowHandle);
        BOOL ret = EnumChildWindows(windowHandle, GetButtonHandle, 0); //find the button
        cout << buttonHandle << endl;
        if (buttonHandle != 0)
        {
            LRESULT res = SendMessage(buttonHandle, BM_CLICK, 0, 0);
        }
    }
}

这应当做到。

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