private static int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
var keyBoardHookInfo = (KeyHookExternal.KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyHookExternal.KeyboardHookStruct));
var handled = false;
if (wParam == KeyHookExternal.WM_KEYDOWN || wParam == KeyHookExternal.WM_SYSKEYDOWN || wParam == KeyHookExternal.WM_KEYUP || wParam == KeyHookExternal.WM_SYSKEYUP)
{
var keyType = wParam == KeyHookExternal.WM_SYSKEYDOWN || wParam == KeyHookExternal.WM_SYSKEYUP ? EKeyType.System : EKeyType.Common;
var state = wParam == KeyHookExternal.WM_KEYDOWN || wParam == KeyHookExternal.WM_SYSKEYDOWN ? EState.Down : EState.Up;
var keyData = (Keys)keyBoardHookInfo.VirtualKeyCode;
var e = new KeyboardEventArgs(state, keyType, keyData);
if (_exclusiveKeyboardHandlers.Any())
{
foreach (var kvp in _exclusiveKeyboardHandlers)
{
if (kvp.Value != null)
{
kvp.Value.Invoke(e);
handled = nCode > 0 && e.Handled;
}
}
}
else
{
foreach (var kvp in _keyPressHandlers)
{
if (kvp.Value != null)
{
kvp.Value.Invoke(e);
}
}
}
}
if (handled)
{
return(-1);
}
return(KeyHookExternal.CallNextHookEx(_keyboardHookHandle, nCode, wParam, lParam));
}
private static void InitializeMonitor()
{
if (_keyboardHookHandle == 0)
{
_keyboardHookDelegate = KeyboardHookProc;
_keyboardHookHandle = KeyHookExternal.SetWindowsHookEx(
KeyHookExternal.WH_KEYBOARD_LL,
_keyboardHookDelegate,
KeyHookExternal.GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName), 0);
//If SetWindowsHookEx fails.
if (_keyboardHookHandle == 0)
{
//Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
int errorCode = Marshal.GetLastWin32Error();
//do cleanup
//Initializes and throws a new instance of the Win32Exception class with the specified error.
throw new Win32Exception(errorCode);
}
}
}