Keyboard events handler for C# WinForms application

Question

Hi,

how can I do global keyboard event handler for C# winform application? I think it should be a separate class with some methods and events, but I do not know exactely how to do this. Global handler should provide funcionallity to catch key pressed (for handling shortcuts).

best regards

Danatas Gervi · Answer

May be keyboard hook will be usefull? using System; using System.Collections.Generic; using System.Text; using System.Diagnostics; using System.Runtime.InteropServices; namespace hook { class Program { private const int WH_KEYBOARD_LL = 13; private const int WM_KEYDOWN = 0x0100; private static LowLevelKeyboardProc _proc = HookCallback; private static IntPtr _hookID = IntPtr.Zero; static void Main() { _hookID = SetHook(_proc); Application.Run(); UnhookWindowsHookEx(_hookID); } private static IntPtr SetHook(LowLevelKeyboardProc proc) { using (Process curProcess = Process.GetCurrentProcess()) using (ProcessModule curModule = curProcess.MainModule) { return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0); } } private delegate IntPtr LowLevelKeyboardProc( int nCode, IntPtr wParam, IntPtr lParam); private static IntPtr HookCallback( int nCode, IntPtr wParam, IntPtr lParam) { if ((nCode >= 0) && (wParam == (IntPtr)WM_KEYDOWN)) { int vkCode = Marshal.ReadInt32(lParam); if (((Keys)vkCode == Keys.LWin) || ((Keys)vkCode == Keys.RWin)) { Console.WriteLine( "{0} blocked!" , (Keys)vkCode); return (IntPtr)1; } } return CallNextHookEx(_hookID, nCode, wParam, lParam); } [DllImport( "user32.dll" , CharSet = CharSet.Auto, SetLastError = true )] private static extern IntPtr SetWindowsHookEx( int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId); [DllImport( "user32.dll" , CharSet = CharSet.Auto, SetLastError = true )] private static extern bool UnhookWindowsHookEx(IntPtr hhk); [DllImport( "user32.dll" , CharSet = CharSet.Auto, SetLastError = true )] private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam); [DllImport( "kernel32.dll" , CharSet = CharSet.Auto, SetLastError = true )] private static extern IntPtr GetModuleHandle( string lpModuleName); } }

Roei Bar · Answer

you can also use this Post from MS http://support.microsoft.com/kb/320584

Master Billa · Answer

HI http://www.codeproject.com/KB/cs/globalhook.aspx thank you