无法在 Windows 10 下关闭 OSK.exe

Question

我用下面的代码打开osk.exe

HINSTANCE Dlg::ExecuteOSK()
{
    typedef BOOL (WINAPI * LPFN_IsWow64Process)(HANDLE, PBOOL);
    typedef BOOL (WINAPI * LPFN_Wow64DisableWow64FsRedirection)(PVOID *);
    typedef BOOL (WINAPI * LPFN_Wow64RevertWow64FsRedirection)(PVOID);
    LPFN_IsWow64Process fnIsWow64Process = NULL;
    LPFN_Wow64DisableWow64FsRedirection fnWow64DisableWow64FsRedirection = NULL;
    LPFN_Wow64RevertWow64FsRedirection fnWow64RevertWow64FsRedirection = NULL;
    fnIsWow64Process = (LPFN_IsWow64Process) GetProcAddress(GetModuleHandle(TEXT("kernel32")), "IsWow64Process");
    fnWow64DisableWow64FsRedirection = (LPFN_Wow64DisableWow64FsRedirection) GetProcAddress(GetModuleHandle(TEXT("kernel32")), "Wow64DisableWow64FsRedirection");
    fnWow64RevertWow64FsRedirection = (LPFN_Wow64RevertWow64FsRedirection) GetProcAddress(GetModuleHandle(TEXT("kernel32")), "Wow64RevertWow64FsRedirection");
    BOOL bIsWow64 = FALSE;
    PVOID OldValue = NULL;
    HINSTANCE handle;
    if (NULL == fnIsWow64Process || NULL == fnWow64DisableWow64FsRedirection || NULL == fnWow64RevertWow64FsRedirection)
    {
        handle = ::ShellExecute(NULL, "open", "OSK", NULL, NULL, SW_SHOW);
    }
    else
    {
        fnIsWow64Process(GetCurrentProcess(), &bIsWow64);

        if (TRUE == bIsWow64)
        {
            fnWow64DisableWow64FsRedirection(&OldValue);
            handle = ::ShellExecute(NULL, "open", "OSK", NULL, NULL, SW_SHOW);
            fnWow64RevertWow64FsRedirection(OldValue);
        }
        else
        {
            handle = ::ShellExecute(NULL, "open", "OSK", NULL, NULL, SW_SHOW);
        }
    }
    return handle;
}

然后，我想在用户按下回车键时关闭 osk.exe。

BOOL CALLBACK EnumWindowsProc(
  _In_ HWND   hwnd,
   _In_ LPARAM lParam)
{
    char name[256];
    GetClassName( hwnd, name, sizeof(name) );
    if(strcmp(name,"OSKMainClass") == 0)
        SendMessage(hwnd, WM_CLOSE  , NULL, NULL); //I have tried WM_DESTROY
    return TRUE;
}

BOOL Dlg::PreTranslateMessage(MSG* pMsg) 
{
    if (pMsg->message == WM_KEYDOWN)
    {       
        int nKey = (int)pMsg->wParam;       

        switch(nKey)            
        {
        case VK_RETURN:     
            EnumWindows(EnumWindowsProc, NULL);

        }
    }

    return CBitmapDialog::PreTranslateMessage(pMsg);
}

但是，这部分代码不能用来关闭osk.exe成功。

我试过抓另一个window，可以成功关闭

Windows10 有问题吗？

Answer 1

如果您想查看 osk.exe 的清单，您可以在此处查看下一个 - uiAccess="true" 这是 User Interface Privilege Isolation (UIPI) , also read about similar problem UIAccess in Manifest Files

因为 osk.exe 在清单中有 uiAccess="true" 它在令牌中有 Mandatory Label\High Mandatory Level。但是你的应用程序，如果运行ning 在 UAC 下没有提升，通常有 Medium Mandatory Level。结果：

A lower-privilege process cannot:

Use SendMessage or PostMessage to application windows running with higher rights. These APIs return success but silently drop the window message.

但如果您的应用程序获得 High Mandatory Level 令牌 - 您可以通过下一个代码关闭 osk.exe：

if (HWND hwnd = FindWindow(L"OSKMainClass", 0))
{
    PostMessage(hwnd, WM_CLOSE, 0, 0);
}

因此您需要 <requestedExecutionLevel level='requireAdministrator' uiAccess='false'/> 在清单中或以某种方式运行您的应用程序已提升

无法在 Windows 10 下关闭 OSK.exe

Can' t close OSK.exe under Windows 10

c++

winapi

mfc

win32gui