Question

90％的时间我无法从osk.exe上的32位进程启动Win7 x64。最初代码只是使用：

Process.Launch("osk.exe");

由于目录虚拟化，这对x64无效。不是我想的问题，我只是禁用虚拟化，启动应用程序，然后再次启用它，我认为是正确的做事方式。我还添加了一些代码，如果它已经被最小化（这可以正常工作）使键盘恢复 - 代码（在示例WPF应用程序中）现在看起来如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;using System.Diagnostics;
using System.Runtime.InteropServices;

namespace KeyboardTest
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        [DllImport("kernel32.dll", SetLastError = true)]
        private static extern bool Wow64DisableWow64FsRedirection(ref IntPtr ptr);
        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern bool Wow64RevertWow64FsRedirection(IntPtr ptr);

        private const UInt32 WM_SYSCOMMAND = 0x112;
        private const UInt32 SC_RESTORE = 0xf120;
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);

        private string OnScreenKeyboadApplication = "osk.exe";

        public MainWindow()
        {
            InitializeComponent();
        }

        private void KeyboardButton_Click(object sender, RoutedEventArgs e)
        {
            // Get the name of the On screen keyboard
            string processName = System.IO.Path.GetFileNameWithoutExtension(OnScreenKeyboadApplication);

            // Check whether the application is not running 
            var query = from process in Process.GetProcesses()
                        where process.ProcessName == processName
                        select process;

            var keyboardProcess = query.FirstOrDefault();

            // launch it if it doesn't exist
            if (keyboardProcess == null)
            {
                IntPtr ptr = new IntPtr(); ;
                bool sucessfullyDisabledWow64Redirect = false;

                // Disable x64 directory virtualization if we're on x64,
                // otherwise keyboard launch will fail.
                if (System.Environment.Is64BitOperatingSystem)
                {
                    sucessfullyDisabledWow64Redirect = Wow64DisableWow64FsRedirection(ref ptr);
                }

                // osk.exe is in windows/system folder. So we can directky call it without path
                using (Process osk = new Process())
                {
                    osk.StartInfo.FileName = OnScreenKeyboadApplication;
                    osk.Start();
                    osk.WaitForInputIdle(2000);
                }

                // Re-enable directory virtualisation if it was disabled.
                if (System.Environment.Is64BitOperatingSystem)
                    if (sucessfullyDisabledWow64Redirect)
                        Wow64RevertWow64FsRedirection(ptr);
            }
            else
            {
                // Bring keyboard to the front if it's already running
                var windowHandle = keyboardProcess.MainWindowHandle;
                SendMessage(windowHandle, WM_SYSCOMMAND, new IntPtr(SC_RESTORE), new IntPtr(0));
            }
        }
    }
}

但是这段代码在大多数情况下会在osk.Start()上抛出以下异常：

找不到指定的程序在System.Diagnostics.Process.StartWithShellExecuteEx（ProcessStartInfo startInfo）

我尝试在osk.Start行周围放置长的Thread.Sleep命令，只是为了确保它不是竞争条件，但同样的问题仍然存在。任何人都可以发现我做错了什么，或者为此提供替代解决方案吗？似乎可以正常启动记事本，它只是不会在屏幕键盘上播放。

Answer 1

在64位操作系统上运行的32位应用程序应该启动64位版本的osk.exe。下面你会看到一个用C＃编写的代码，用来启动正确的屏幕键盘。

    private static void ShowKeyboard()
    {
        var path64 = @"C:\Windows\winsxs\amd64_microsoft-windows-osk_31bf3856ad364e35_6.1.7600.16385_none_06b1c513739fb828\osk.exe";
        var path32 = @"C:\windows\system32\osk.exe";
        var path = (Environment.Is64BitOperatingSystem) ? path64 : path32;
        Process.Start(path);
    }

Answer 2

我对您收到的确切错误消息没有非常可靠的解释。但禁用重定向会破坏.NET框架。默认情况下，Process.Start（）P /调用ShellExecuteEx（）API函数来启动进程。此函数位于shell32.dll中，如果之前未执行过，则可能需要加载该DLL。禁用重定向时，你会得到错误的。

解决方法是将ProcessStartInfo.UseShellExecute设置为false。你在这里不需要它。

显然，禁用重定向是一种冒险的方法，会产生您无法预测的副作用。有 lot 的DLL可以加载需求。使用Platform Target = Any CPU编译的一个非常小的帮助程序EXE可以解决您的问题。

Answer 3

某些事情正在进行，需要您从MTA线程启动osk.exe。原因似乎是对Wow64DisableWow64FsRedirection的调用仅影响当前线程。但是，在某些条件下，Process.Start将从单独的线程创建新进程，例如当UseShellExecute设置为false时，以及从STA线程调用时。

下面的代码检查公寓状态，然后确保从MTA线程启动屏幕键盘：

using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;

class Program
{
    [DllImport("kernel32.dll", SetLastError = true)]
    private static extern bool Wow64DisableWow64FsRedirection(ref IntPtr ptr);
    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern bool Wow64RevertWow64FsRedirection(IntPtr ptr);


    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    static extern IntPtr SendMessage(IntPtr hWnd, 
        UInt32 Msg, 
        IntPtr wParam, 
        IntPtr lParam);
    private const UInt32 WM_SYSCOMMAND = 0x112;
    private const UInt32 SC_RESTORE = 0xf120;

    private const string OnScreenKeyboardExe = "osk.exe";

    [STAThread]
    static void Main(string[] args)
    {
        Process[] p = Process.GetProcessesByName(
            Path.GetFileNameWithoutExtension(OnScreenKeyboardExe));

        if (p.Length == 0)
        {
            // we must start osk from an MTA thread
            if (Thread.CurrentThread.GetApartmentState() == ApartmentState.STA)
            {
                ThreadStart start = new ThreadStart(StartOsk);
                Thread thread = new Thread(start);
                thread.SetApartmentState(ApartmentState.MTA);
                thread.Start();
                thread.Join();
            }
            else
            {
                StartOsk();
            }
        }
        else
        {
            // there might be a race condition if the process terminated 
            // meanwhile -> proper exception handling should be added
            //
            SendMessage(p[0].MainWindowHandle, 
                WM_SYSCOMMAND, new IntPtr(SC_RESTORE), new IntPtr(0));
        }
    }

    static void StartOsk()
    {
        IntPtr ptr = new IntPtr(); ;
        bool sucessfullyDisabledWow64Redirect = false;

        // Disable x64 directory virtualization if we're on x64,
        // otherwise keyboard launch will fail.
        if (System.Environment.Is64BitOperatingSystem)
        {
            sucessfullyDisabledWow64Redirect = 
                Wow64DisableWow64FsRedirection(ref ptr);
        }


        ProcessStartInfo psi = new ProcessStartInfo();
        psi.FileName = OnScreenKeyboardExe;
        // We must use ShellExecute to start osk from the current thread
        // with psi.UseShellExecute = false the CreateProcessWithLogon API 
        // would be used which handles process creation on a separate thread 
        // where the above call to Wow64DisableWow64FsRedirection would not 
        // have any effect.
        //
        psi.UseShellExecute = true;
        Process.Start(psi);

        // Re-enable directory virtualisation if it was disabled.
        if (System.Environment.Is64BitOperatingSystem)
            if (sucessfullyDisabledWow64Redirect)
                Wow64RevertWow64FsRedirection(ptr);
    }
}

Answer 4

这是我的代码

            var path64 = Path.Combine(Directory.GetDirectories(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Windows), "winsxs"), "amd64_microsoft-windows-osk_*")[0], "osk.exe");
            var path32 = @"C:\windows\system32\osk.exe";
            var path = (Environment.Is64BitOperatingSystem) ? path64 : path32;
            if(File.Exists(path))
            {
                Process.Start(path);
            }

Answer 5

笨拙的方法：

侧面运行此批处理文件（从64位资源管理器启动）：

:lab0
TIMEOUT /T 1 >nul
if exist oskstart.tmp goto lab2
goto lab0
:lab2
del oskstart.tmp
osk
goto lab0

当您需要键盘时创建文件oskstart.tmp

Answer 6

对于那些面临“无法启动屏幕键盘”的人，请将项目的平台目标更改为任何CPU。

Answer 7

Cambiar las propiedades delaaplicación。 COMPILAR - Desmarcar检查优先32位。

更改应用属性 Compila - 取消选中'BEST 32 BITS'（或类似）

您可以阅读：

http://blog.anthonybaker.me/2012/08/spawning-windows-on-screen-keyboard-osk.html

或使用此选项进行其他应用以及从主应用中午餐（运行）。

无法在Win7 x64上从32位进程启动屏幕键盘（osk.exe）

7 个答案: