private static KeyPressEventArgsExt CreateNonChar()
{
KeyPressEventArgsExt e = new KeyPressEventArgsExt((char)0x0);
e.IsNonChar = true;
e.Timestamp = Environment.TickCount;
return e;
}
private void InvokeKeyPress(KeyPressEventArgsExt e)
{
KeyPressEventHandler handler = KeyPress;
if (handler == null || e.Handled || e.IsNonChar) { return; }
handler(this, e);
}
/// <summary>
/// Creates <see cref="KeyPressEventArgsExt"/> from Windows Message parameters,
/// based upon a system-wide hook.
/// </summary>
/// <param name="wParam">The first Windows Message parameter.</param>
/// <param name="lParam">The second Windows Message parameter.</param>
/// <returns>A new KeyPressEventArgsExt object.</returns>
internal static KeyPressEventArgsExt FromRawDataGlobal(int wParam, IntPtr lParam)
{
if (wParam != Messages.WM_KEYDOWN)
{
return CreateNonChar();
}
KeyboardHookStruct keyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
int virtualKeyCode = keyboardHookStruct.VirtualKeyCode;
int scanCode = keyboardHookStruct.ScanCode;
int fuState = keyboardHookStruct.Flags;
char ch;
bool isSuccessfull = Keyboard.TryGetCharFromKeyboardState(virtualKeyCode, scanCode, fuState, out ch);
if (!isSuccessfull)
{
return CreateNonChar();
}
KeyPressEventArgsExt e = new KeyPressEventArgsExt(ch);
e.Timestamp = keyboardHookStruct.Time; // Update the timestamp to use the actual one from KeyboardHookStruct
return e;
}
/// <summary>
/// Creates <see cref="KeyPressEventArgsExt"/> from Windows Message parameters,
/// based upon a system-wide hook.
/// </summary>
/// <param name="wParam">The first Windows Message parameter.</param>
/// <param name="lParam">The second Windows Message parameter.</param>
/// <returns>A new KeyPressEventArgsExt object.</returns>
internal static KeyPressEventArgsExt FromRawDataGlobal( int wParam, IntPtr lParam )
{
if ( wParam != Messages.WM_KEYDOWN )
{
return new KeyPressEventArgsExt( ( char )0 );
}
KeyboardHookStruct keyboardHookStruct = ( KeyboardHookStruct )Marshal.PtrToStructure( lParam, typeof( KeyboardHookStruct ) );
int virtualKeyCode = keyboardHookStruct.VirtualKeyCode;
int scanCode = keyboardHookStruct.ScanCode;
int fuState = keyboardHookStruct.Flags;
char ch;
if ( virtualKeyCode == KeyboardNativeMethods.VK_PACKET )
{
ch = ( char )scanCode;
}
else
{
bool isSuccessfull = KeyboardNativeMethods.TryGetCharFromKeyboardState( virtualKeyCode, scanCode, fuState, out ch );
if ( !isSuccessfull )
{
return new KeyPressEventArgsExt( ( char )0 );
}
}
KeyPressEventArgsExt e = new KeyPressEventArgsExt( ch, keyboardHookStruct.Time );
return e;
}
private void InvokeKeyPress(int wParam, IntPtr lParam)
{
InvokeKeyPress(KeyPressEventArgsExt.FromRawData(wParam, lParam, IsGlobal));
}