SendMessage函数来模拟右键单击崩溃的目标应用 [英] SendMessage to simulate right-click crashes the target app

问题描述

我正在写一个C＃自动化工具。

I'm writing a C# automation tool.

由于微软UI自动化不提供模拟右键单击或提高上下文菜单的任何方式，我用 SendMessage函数来做到这一点吧。我宁可不使用 SendInput ，因为我不想必须抓住重点。

Since Microsoft UI Automation doesn't provide any way of simulating right-clicks or raising context menus, I'm using SendMessage to do this instead. I'd rather not use SendInput because I don't want to have to grab focus.

当我称之为 SendMessage函数，但是，它崩溃的目标应用程序。

When I call SendMessage, however, it crashes the target app.

下面是我的code：

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);

    public void RightClick<T>(T element) where T: AutomationElementWrapper
    {
        const int MOUSEEVENTF_RIGHTDOWN = 0x0008; /* right button down */
        const int MOUSEEVENTF_RIGHTUP = 0x0010; /* right button up */

        var point = element.Element.GetClickablePoint();
        var processId = element.Element.GetCurrentPropertyValue(AutomationElement.ProcessIdProperty);
        var window = AutomationElement.RootElement.FindFirst(
            TreeScope.Children,
            new PropertyCondition(AutomationElement.ProcessIdProperty,
                                  processId));
        var handle = window.Current.NativeWindowHandle;

        var x = point.X;
        var y = point.Y;

        var value = ((int)x)<<16 + (int)y;

        SendMessage(new IntPtr(handle), MOUSEEVENTF_RIGHTDOWN, IntPtr.Zero, new IntPtr(value));
        SendMessage(new IntPtr(handle), MOUSEEVENTF_RIGHTUP, IntPtr.Zero, new IntPtr(value));
    }

任何想法，我做错了吗？

Any idea what I'm doing wrong?

推荐答案

你的类型的混合起来。您使用 SendMessage函数，这需要一个窗口消息（按照惯例被命名为 WM _ ...），但你传递给它的意思为 SendInput A MOUSEINPUT.dwFlags 值（被命名为 MOUSEEVENTF _ ...）。你基本上是路过的乱码。

You're mixing up your types. You're using SendMessage, which takes a window message (which by convention are named WM_...), but you're passing it a MOUSEINPUT.dwFlags value that's meant for SendInput (which are named MOUSEEVENTF_...). You're basically passing gibberish.

你的code实际上做的是发送的数值为8的窗口消息（在窗口消息，手段 WM_KILLFOCUS ），其次是一个窗口为0x10 == 16消息（ WM_CLOSE ）。它是很可能导致您的问题是后者 - 你告诉窗口关闭。我不知道为什么它会崩溃，但肯定会退出。

What your code is actually doing is sending a window message whose numeric value is 8 (which, in window messages, means WM_KILLFOCUS), followed by a window message of 0x10 == 16 (WM_CLOSE). It's the latter that's likely causing you problems -- you're telling the window to close. I'm not sure why it would crash, but it would certainly exit.

如果你使用 SendMessage函数，你需要将它传递窗口消息（ WM _ ，例如 WM_RBUTTONDOWN 和 WM_RBUTTONUP ）。

If you're using SendMessage, you need to pass it window messages (WM_, for example WM_RBUTTONDOWN and WM_RBUTTONUP).

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