Question

我目前正在设计一个图像查看器，允许用户输入她的电子邮件并以数字方式获取图像。困扰我的部分是让屏幕键盘关闭。我使用这段代码来启动Windows进程：

string progFiles = @"C:\Program Files\Common Files\Microsoft Shared\ink";
string keyboardPath = Path.Combine(progFiles, "TabTip.exe");
Process keyboardProc = Process.Start(keyboardPath);

之后我打开一个VB InputBox来提示输入电子邮件地址（我使用屏幕键盘，因为应用程序将显示在触摸屏上）。在此提示之后，我想自动关闭该过程。

我尝试使用以下内容关闭此过程：

keyboardProc.Kill();
keyboardProc.Dispose();
keyboardProc.Close();
keyboardProc = null;

它们都不起作用，只是抛出异常：

An unhandled exception of type 'System.InvalidOperationException' occurred in System.dll
Additional information: Cannot process request because the process has exited.

我也尝试通过ID识别流程并以这种方式关闭它，也不起作用。我也看过： C#/.NET: Closing another process outside the main window 但是没有让它工作...... :(

我对C＃很陌生，这是我第一次从代码中调用Windows进程 - 我错过了什么？

非常感谢你！

Answer 1

我也遇到了麻烦。由于某些原因，它可以解决所有打开的TabTip流程。

            //Kill all on screen keyboards
            Process[] oskProcessArray = Process.GetProcessesByName("TabTip");
            foreach (Process onscreenProcess in oskProcessArray)
            {
                onscreenProcess.Kill();
            }

Answer 2

    /// <summary>
    /// Show the On Screen Keyboard
    /// </summary>
    #region ShowOSK
    public static void ShowOnScreenKeyboard()
    {
        ProcessStartInfo startInfo = new ProcessStartInfo(@"C:\Program Files\Common Files\Microsoft Shared\ink\TabTip.exe");
        Process.Start(startInfo);
    }
    #endregion ShowOSK

    /// <summary>
    /// Hide the On Screen Keyboard
    /// </summary>
    #region HideOSK
    public static void HideOnScreenKeyboard()
    {
        uint WM_SYSCOMMAND = 274;
        uint SC_CLOSE = 61536;
        IntPtr KeyboardWnd = FindWindow("IPTip_Main_Window", null);
        PostMessage(KeyboardWnd.ToInt32(), WM_SYSCOMMAND, (int)SC_CLOSE, 0);
    }
    #endregion HideOSK

Answer 3

与直接执行/关闭TabTip.exe相比，以下代码将以最快的速度打开/关闭Window 10上的Touch Keyboard。（在低功率平板电脑上测试）。

    [return: MarshalAs(UnmanagedType.Bool)]
    [DllImport("user32.dll", SetLastError = true)]
    static extern bool PostMessage(IntPtr hWnd, uint Msg, UIntPtr wParam, IntPtr lParam);

    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    static extern IntPtr FindWindow(String sClassName, String sAppName);

    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, String lpszClass, String lpszWindow);

    /// <summary>
    /// Show the On Screen Keyboard
    /// </summary>
    #region ShowOSK
    public static void ShowOnScreenKeyboard()
    {
        IntPtr parent = FindWindow("Shell_TrayWnd", null);
        IntPtr child1 = FindWindowEx(parent, IntPtr.Zero, "TrayNotifyWnd", "");
        IntPtr keyboardWnd = FindWindowEx(child1, IntPtr.Zero, null, "Touch keyboard");

        uint WM_LBUTTONDOWN = 0x0201;
        uint WM_LBUTTONUP = 0x0202;
        UIntPtr x = new UIntPtr(0x01);
        UIntPtr x1 = new UIntPtr(0);
        IntPtr y = new IntPtr(0x0240012);
        PostMessage(keyboardWnd, WM_LBUTTONDOWN, x, y);
        PostMessage(keyboardWnd, WM_LBUTTONUP, x1, y);
    }
    #endregion ShowOSK

    /// <summary>
    /// Hide the On Screen Keyboard
    /// </summary>
    #region HideOSK
    public static void HideOnScreenKeyboard()
    {
        uint WM_SYSCOMMAND = 0x0112;
        UIntPtr SC_CLOSE = new UIntPtr(0xF060);
        IntPtr y = new IntPtr(0);
        IntPtr KeyboardWnd = FindWindow("IPTip_Main_Window", null);
        PostMessage(KeyboardWnd, WM_SYSCOMMAND, SC_CLOSE, y);
    }
    #endregion HideOSK

Answer 4

你能做到：

            Process process = new Process();

            process.StartInfo.FileName = progFiles;//Filename
            process.Start();
            process.Close();

如何正确关闭C＃winform的屏幕键盘进程？

4 个答案: