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无法从Win7 x64上的32位进程启动屏幕键盘(osk.exe)

on-screen-keyboard 64bit exception wpf c#

Steven Robbins · 技术社区 · 14 年前

90%的时间我无法启动 osk.exe 从32位进程开始 Win7 x64 . 最初代码只是使用:

Process.Launch("osk.exe");

因为目录虚拟化,它不能在x64上工作。我想没问题,我只是禁用虚拟化,启动应用程序,然后再次启用它,我思想是正确的做事方式。我还添加了一些代码,以便在最小化(这很好)的情况下重新启动键盘-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));
            }
        }
    }
}

但大多数情况下,此代码会在 osk.Start() :

找不到指定的过程在System.Diagnostics.Process.StartWithShellExecuteEx(ProcessStartInfo StartInfo)上

我试过在osk.start行周围放置long-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。有没有人能发现我做错了什么,或者提供一个替代的解决方案?它似乎为了启动记事本,它不能用屏幕上的键盘玩球。

6 回复 | 直到 8 年前

Hans Passant 14 年前

对于您收到的确切错误信息,我没有非常可靠的解释。但是禁用重定向会破坏.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,如果以前没有加载,则可能需要加载该dll。当你禁用重定向时,你会得到错误的。

解决方法是将processStartInfo.useShellExecute设置为false。你不需要在这里。

很明显,禁用重定向是一种危险的方法,其副作用您无法真正预测。有 太多了 加载请求的DLL。用platform target=any cpu编译的非常小的helper exe可以解决您的问题。

Rudy Meijer 9 年前

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。下面你看到一个用C语言编写的代码,它可以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);
    }

Dirk Vollmar 14 年前

某些事情在幕后进行,需要从MTA线程启动osk.exe。原因似乎是 Wow64DisableWow64FsRedirection 只影响当前线程。但是,在某些条件下, Process.Start 将从单独的线程创建新进程,例如 UseShellExecute 设置为false,当从sta线程调用时也是如此。

下面的代码检查单元状态,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);
    }
}

archimedes 9 年前

笨拙的方法:

在一侧运行此批处理文件(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

需要键盘时创建文件oskstart.tmp

-1

R.Alonso 8 年前

坎比亚拉阿普利卡奇村(Cambiar las Propiedades de la Aplicaci)N. compilar-Desmarcar检查首选项32位。

更改应用程序属性 compila-取消选中“最佳32位”(或类似)

您可以阅读:

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

或使用此选项执行其他应用程序,并从主应用程序中选择午餐(跑步)。

-2

Marcio 11 年前

对于那些面临“无法在屏幕键盘上启动”的问题,请将项目的平台目标更改为任何CPU。