如何使用低級別的鍵盤鉤子在C＃

Question

誰能告訴我如何使用C＃來禁用任務切換鍵，禁止任務切換鍵（WINKEY，ALT標籤，ALT-ESC，CTRL-ESC）

Answer 1

我已經得到了完整的代碼禁用Windows鍵，Alt鍵 + 標籤等..

現在我提供以下代碼作爲其他人的參考：

/* Code to Disable WinKey, Alt+Tab, Ctrl+Esc Starts Here */ 

    // Structure contain information about low-level keyboard input event 
    [StructLayout(LayoutKind.Sequential)] 
    private struct KBDLLHOOKSTRUCT 
    { 
     public Keys key; 
     public int scanCode; 
     public int flags; 
     public int time; 
     public IntPtr extra; 
    } 
    //System level functions to be used for hook and unhook keyboard input 
    private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam); 
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] 
    private static extern IntPtr SetWindowsHookEx(int id, LowLevelKeyboardProc callback, IntPtr hMod, uint dwThreadId); 
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] 
    private static extern bool UnhookWindowsHookEx(IntPtr hook); 
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] 
    private static extern IntPtr CallNextHookEx(IntPtr hook, int nCode, IntPtr wp, IntPtr lp); 
    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)] 
    private static extern IntPtr GetModuleHandle(string name); 
    [DllImport("user32.dll", CharSet = CharSet.Auto)] 
    private static extern short GetAsyncKeyState(Keys key); 
    //Declaring Global objects  
    private IntPtr ptrHook; 
    private LowLevelKeyboardProc objKeyboardProcess; 

    private IntPtr captureKey(int nCode, IntPtr wp, IntPtr lp) 
    { 
     if (nCode >= 0) 
     { 
      KBDLLHOOKSTRUCT objKeyInfo = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lp, typeof(KBDLLHOOKSTRUCT)); 

      // Disabling Windows keys 

      if (objKeyInfo.key == Keys.RWin || objKeyInfo.key == Keys.LWin || objKeyInfo.key == Keys.Tab && HasAltModifier(objKeyInfo.flags) || objKeyInfo.key == Keys.Escape && (ModifierKeys & Keys.Control) == Keys.Control)  
      { 
       return (IntPtr)1; // if 0 is returned then All the above keys will be enabled 
      } 
     } 
     return CallNextHookEx(ptrHook, nCode, wp, lp); 
    } 

    bool HasAltModifier(int flags) 
    { 
     return (flags & 0x20) == 0x20; 
    } 

    /* Code to Disable WinKey, Alt+Tab, Ctrl+Esc Ends Here */ 

然後Inside Form_Load（）;

private void Form_Load(object sender, EventArgs e) 
    { 
     ProcessModule objCurrentModule = Process.GetCurrentProcess().MainModule; 
     objKeyboardProcess = new LowLevelKeyboardProc(captureKey); 
     ptrHook = SetWindowsHookEx(13, objKeyboardProcess, GetModuleHandle(objCurrentModule.ModuleName), 0); 
    } 

Answer 2

您可以使用OnKeyDown事件來捕獲按下的按鍵，並抑制不想允許的按鍵。

Scott Hanselman的BabySmash application確實禁用了alt-tab alt-esc等大多數按鍵筆畫。大多數source and development都可以在他的博客中找到。來源是GitHub。在源代碼中，您會看到他使用許多win32調用的InterceptKeys類來獲取按下按鍵的低級掛鉤。然後他在App.xaml.cs文件中的HookCallback中處理這些內容。希望這可以幫助。

Similar Question

Another Similar