在c＃中禁用键盘/鼠标

Question

I need to disable keyboard/mouse or both for specific time period at system level in my application.

I have following to do that

    public partial class NativeMethods
    {
        /// Return Type: BOOL->int
        ///fBlockIt: BOOL->int
        [System.Runtime.InteropServices.DllImportAttribute("user32.dll", EntryPoint = "BlockInput")]
        [return: System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)]
        public static extern bool BlockInput([System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)] bool fBlockIt);

    }

By this code the task is complete but when user click on CTRL+ALT+DELETE keyboard and mouse are working again. Can any body tell me how to stop this?

Answer 1

Windows level shortcuts and macros ( CTRL + ALT + DEL , WINDOWS + L , ALT + TAB , CTRL + SHIFT + ESC ) are messages that are not processed by your application, they're processed by windows runtime. You can check this by creating a simple form and overriding the WndProc method and checking those messages.
Anyway here are some tutorials on how to hook the keyboard:

• http://www.codeproject.com/Articles/19004/A-Simple-C-Global-Low-Level-Keyboard-Hook
• http://www.codeproject.com/Articles/7294/Processing-Global-Mouse-and-Keyboard-Hooks-in-C
• http://blogs.msdn.com/b/toub/archive/2006/05/03/589423.aspx