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我正在制作一个需要使用似乎没有实现 UI 自动化元素的程序的 UI 的应用程序（Inspect.Exe 只显示主窗格，没有子窗格）。

所以我研究了实现我需要的功能的最佳方法是什么，并发现了 SendInput()，它显然是 keybd_event() 和 mouse_event() 的更新版本。

但是，由于它需要键盘焦点，并且由于我无法将目标窗口设置为前台（以避免在运行时打扰用户），所以我一直在搜索，直到找到这个答案。我按照 Skurmedel 所说的做了，并将我的应用程序线程加入了目标的窗口线程。但是现在，即使我 SetFocus() 到目标然后 SendInput()，目标窗口也不会受到影响。

我的问题要么是“为什么这不起作用？” 或“我做错了什么？”，但我想一个代码示例将有助于解决这个问题：

线程处理程序类

class ThreadHandler
{
    #region P/Invoking and constants definition
    const uint WM_GETTEXT = 0x000D;

    [DllImport("user32.dll")]
    static extern IntPtr SetFocus(IntPtr hWnd);

    [DllImport("user32.dll")]
    private static extern int GetWindowThreadProcessId(IntPtr hWnd, uint lpdwProcessId = 0);

    delegate bool EnumThreadDelegate(IntPtr hWnd, IntPtr lParam);
    [DllImport("user32.dll")]
    static extern bool EnumThreadWindows(int dwThreadId, EnumThreadDelegate lpfn,
        IntPtr lParam);

    [DllImport("user32.dll")]
    static extern bool AttachThreadInput(int idAttach, int idAttachTo, bool fAttach);

    [DllImport("kernel32.dll")]
    static extern int GetCurrentThreadId();

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

    #endregion

    public readonly string ProcessName, WindowName;
    protected readonly int TargetThreadID, CurrentThreadID;
    protected readonly IntPtr TargetWindowHandle;

    public ThreadHandler(string processName, string windowName)
    {
        CurrentThreadID = GetCurrentThreadId();
        ProcessName = processName;
        WindowName = windowName;

        object[] objs = GetWindowThread(processName, windowName);
        if (objs == null)
        {
            throw new ArgumentException("Could not find the specified process/window.");
        }

        TargetThreadID = (int)objs[0];
        TargetWindowHandle = (IntPtr)objs[1];
    }

    public ThreadHandler(string processName)
    {
        CurrentThreadID = GetCurrentThreadId();
        ProcessName = processName;

        var processes = Process.GetProcessesByName(ProcessName);
        if (processes.Length == 0)
        {
            throw new ArgumentException("Could not find the specified process.");
        }
        var appProc = processes[0];

        WindowName = appProc.MainWindowTitle;
        TargetThreadID = GetWindowThreadProcessId(appProc.MainWindowHandle);
        TargetWindowHandle = appProc.MainWindowHandle;
    }

    public bool AttachThreadInput()
    {
        return AttachThreadInput(CurrentThreadID, TargetThreadID, true);
    }

    public bool DetachThreadInput()
    {
        return AttachThreadInput(CurrentThreadID, TargetThreadID, false);
    }

    public void SetFocus()
    {
        SetFocus(TargetWindowHandle);
    }

    static object[] GetWindowThread(string processName, string windowName)
    {
        var processes = Process.GetProcessesByName(processName);
        if (processes.Length > 0)
        {
            //Fill a list of handles
            var handles = new List<IntPtr>();
            foreach (ProcessThread thread in processes[0].Threads)
                EnumThreadWindows(thread.Id,
                    (hWnd, lParam) => { handles.Add(hWnd); return true; }, IntPtr.Zero);

            //Create a stringbuilder to function as storage unit
            StringBuilder nameBuffer = new StringBuilder(64);
            foreach (var hWnd in handles)
            {
                //And finally compare the caption of the window with the requested name
                nameBuffer.Clear();
                SendMessage(hWnd, WM_GETTEXT, nameBuffer.Capacity, nameBuffer);
                if (nameBuffer.ToString() == windowName)
                {
                    return new object[2] { GetWindowThreadProcessId(hWnd), hWnd };
                }
            }
        }
        return null;
    }
}

申请的主要方法

static void Main(string[] args)
    {
        Console.WriteLine("Please input the name of the process to hook: ");
        string pName = Console.ReadLine();
        Console.WriteLine("Input the name of a specific window, or leave blank: ");
        string pWnd = Console.ReadLine();
        ThreadHandler threadHandler;
        try
        {
            if(!String.IsNullOrWhiteSpace(pWnd))
                threadHandler = new ThreadHandler(pName, pWnd);
            else
                threadHandler = new ThreadHandler(pName);
        }
        catch
        {
            Console.WriteLine("Error: " + pName +" does not seem to be running.");
            Console.ReadKey();
            return;
        }

        if (!threadHandler.AttachThreadInput())
        {
            Console.WriteLine("Error: The application tried to attach its Input Processing Mechanism to " + threadHandler.ProcessName + ", but failed.");
            Console.ReadKey();
            return;
        }
        Console.WriteLine("Input Processing Mechanism correctly attached to " + threadHandler.ProcessName + ".");
        threadHandler.SetFocus();
        InputSimulator.SimulateTextEntry("test"); //InputSimulator is a seemingly famous SendInput wrapper. Replacing this line with the code for a keystroke also doesn't work.
        Console.ReadLine();
        Console.WriteLine("Detaching Input Processing Mechanism.");
        threadHandler.DetachThreadInput();
    }

如果您能向我解释一下 SendInput() 的神秘艺术，请提前致谢。

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1 回答 1

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确保您将击键发送到的特定控件正确聚焦。

您应该能够使用SetFocus将焦点集中到您将击键发送到的控件上。

SendMessage和PostMessage也可用于发送击键，但这是不好的做法，应该避免。

查看System.Windows.Forms.SendKeys以获取有关通过 .NET 中的 Forms 类发送击键的信息。

在很多情况下，如果您自己不需要击键，则只需使用带有WM_SETTEXT的SendMessage更改窗口上的文本（如果这是您想要做的）。

于 2013-07-17T13:04:54.750 回答