Question

我正在尝试禁止任务切换键（例如 winkey ， alt + tab ， alt + esc ， ctrl + esc 等）使用低级键盘钩。

我正在使用以下LowLevelKeyboardProc回调：

IntPtr HookCallback(int nCode, IntPtr wParam, ref KBDLLHOOKSTRUCT lParam) 
{
    if (nCode >= 0)
    {
            bool suppress = false;

            // Suppress left and right windows keys.
            if (lParam.Key == VK_LWIN || lParam.Key == VK_RWIN) 
                suppress = true;

            // Suppress alt-tab.
            if (lParam.Key == VK_TAB && HasAltModifier(lParam.Flags)) 
                suppress = true;

            // Suppress alt-escape.
            if (lParam.Key == VK_ESCAPE && HasAltModifier(lParam.Flags)) 
                suppress = true;

            // Suppress ctrl-escape.
            /* How do I hook CTRL-ESCAPE ? */

            // Suppress keys by returning 1.
            if (suppress) 
                return new IntPtr(1);
    }
    return CallNextHookEx(HookID, nCode, wParam, ref lParam);
}

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

然而，我对如何抑制 CTRL + ESC 组合感到茫然。有什么建议？感谢。

Answer 1

这应该可以解决问题：

bool ControlDown = (GetKeyState(VK_CONTROL) & 0x8000) != 0;
if (lParam.Key == VK_ESCAPE && ControlDown)
    suppress = true;

Answer 2

这是我要工作的，我还添加了Alt + F4以防止应用程序关闭。

    private static bool lastWasCtrlKey = false;

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

            // Disabling Windows keys 
            switch (objKeyInfo.key)
            {
                case Keys.RWin:
                case Keys.LWin:
                case Keys.Tab when HasAltModifier(objKeyInfo.flags):
                case Keys.Escape when HasAltModifier(objKeyInfo.flags):
                case Keys.Delete when HasAltModifier(objKeyInfo.flags):
                case Keys.F4 when HasAltModifier(objKeyInfo.flags):
                case Keys.Escape when lastWasCtrlKey:
                    lastWasCtrlKey = false;
                    return (IntPtr)1; 
                case Keys.LControlKey:
                case Keys.RControlKey:
                    lastWasCtrlKey = true;
                    break;
                case Keys.LShiftKey:
                case Keys.RShiftKey:
                    // Do nothing as the Ctrl key could have been before this
                    break;
                default:
                    lastWasCtrlKey = false;
                    break;
            }
        }
        return CallNextHookEx(ptrHook, nCode, wp, lp);
    }

使用低级键盘钩子抑制任务切换键（winkey，alt-tab，alt-esc，ctrl-esc）

2 个答案: