private bool OnGlobalKeyDown(Key keyCode)
{
GlobalKeyEventArgs args = new GlobalKeyEventArgs(keyCode);
GlobalKeyDown?.Invoke(this, args);
return(args.Handled);
}
/// <summary>
/// 註冊Windows Hook時用到的委派方法，當全域事件發生時會執行這個方法，並提供全域事件資料。
/// </summary>
private static int HookProc(int nCode, IntPtr wParam, IntPtr lParam)
{
KeyEventArgs e = null;
int wParam_Int32 = wParam.ToInt32();
if (nCode >= 0)
{
Win32Native.Structures.KEYBOARDLLHookStruct keyboardHookStruct = (Win32Native.Structures.KEYBOARDLLHookStruct)Marshal.PtrToStructure(lParam, typeof(Win32Native.Structures.KEYBOARDLLHookStruct));
if (GlobalKeyDown != null && (wParam_Int32 == Win32Native.NativeContansts.WM_KEYDOWN || wParam_Int32 == Win32Native.NativeContansts.WM_SYSKEYDOWN))
{
e = new KeyEventArgs(keyboardHookStruct.VirtualKeyCode);
GlobalKeyDown.Invoke(null, e);
}
else if (GlobalKeyUp != null && (wParam_Int32 == Win32Native.NativeContansts.WM_KEYUP || wParam_Int32 == Win32Native.NativeContansts.WM_SYSKEYUP))
{
e = new KeyEventArgs(keyboardHookStruct.VirtualKeyCode);
GlobalKeyUp.Invoke(null, e);
}
}
if (Monopolize || (e != null && e.Handled))
{
return(-1);
}
return(Win32Native.Methods.CallNextHookEx(m_HookHandle, nCode, wParam, lParam));
}
/// <summary>
/// A callback function which will be called every time a keyboard activity is detected.
/// </summary>
/// <param name="nCode">Specifies whether the hook procedure must process the message.</param>
/// <param name="wParam">Specifies whether the message was sent by the current thread.</param>
/// <param name="lParam">A pointer to a CWPSTRUCT structure that contains details about the message.</param>
/// <returns></returns>
private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
// Indicates if any underlying events handled the action.
bool handled = false;
if (nCode >= 0)
{
// Marshal the data from callback.
KBDLLHOOKSTRUCT keyStruct = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(KBDLLHOOKSTRUCT));
// Key was pressed down.
if (GlobalKeyDown != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))
{
GlobalKeyEventHandlerArgs keyEventArgs = new GlobalKeyEventHandlerArgs(
keyStruct.vkCode,
keyStruct.scanCode,
keyStruct.flags,
keyStruct.time,
keyStruct.dwExtraInfo);
GlobalKeyDown.Invoke(null, keyEventArgs);
handled = keyEventArgs.Handled;
}
// Key was released.
if (GlobalKeyUp != null && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
{
GlobalKeyEventHandlerArgs keyEventArgs = new GlobalKeyEventHandlerArgs(
keyStruct.vkCode,
keyStruct.scanCode,
keyStruct.flags,
keyStruct.time,
keyStruct.dwExtraInfo);
GlobalKeyUp.Invoke(null, keyEventArgs);
handled = handled || keyEventArgs.Handled;
}
}
// Exit method here without calling next hook if is event was handled.
if (handled)
{
return(-1);
}
// Call next hook.
return(CallNextHookEx(windowsKeyboardHookHandle, nCode, wParam, lParam));
}
/// <summary>
/// A callback function which will be called every Time a keyboard activity detected.
/// </summary>
/// <param name="nCode">
/// [in] Specifies whether the hook procedure must process the message.
/// If nCode is HC_ACTION, the hook procedure must process the message.
/// If nCode is less than zero, the hook procedure must pass the message to the
/// CallNextHookEx function without further processing and must return the
/// value returned by CallNextHookEx.l
/// </param>
/// <param name="wParam">
/// [in] Specifies whether the message was sent by the current thread.
/// If the message was sent by the current thread, it is nonzero; otherwise, it is zero.
/// </param>
/// <param name="lParam">
/// [in] Pointer to a CWPSTRUCT structure that contains details about the message.
/// </param>
/// <returns>
/// If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
/// If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx
/// and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC
/// hooks will not receive hook notifications and may behave incorrectly as a result. If the hook
/// procedure does not call CallNextHookEx, the return value should be zero.
/// </returns>
private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
//indicates if any of underlaing events set e.Handled flag
var handled = false;
if (nCode >= 0)
{
//read structure KeyboardHookStruct at lParam
var keyStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
//raise KeyDown
if (GlobalKeyDown != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))
{
var keyEventArgs = new GlobalKeyEventHandlerArgs(
keyStruct.VirtualKeyCode,
keyStruct.ScanCode,
keyStruct.Flags,
keyStruct.Time,
keyStruct.ExtraInfo,
null);
GlobalKeyDown.Invoke(null, keyEventArgs);
handled = keyEventArgs.Handled;
}
// raise KeyPress
if (GlobalKeyPressed != null && wParam == WM_KEYDOWN)
{
var isDownShift = ((GetKeyState(VK_SHIFT) & 0x80) == 0x80 ? true : false);
var isDownCapslock = (GetKeyState(VK_CAPITAL) != 0 ? true : false);
var keyState = new byte[256];
GetKeyboardState(keyState);
var inBuffer = new byte[2];
if (ToAscii(keyStruct.VirtualKeyCode,
keyStruct.ScanCode,
keyState,
inBuffer,
keyStruct.Flags) == 1)
{
var key = (char)inBuffer[0];
if ((isDownCapslock ^ isDownShift) && Char.IsLetter(key))
{
key = Char.ToUpper(key);
}
var keyEventArgs = new GlobalKeyEventHandlerArgs(
keyStruct.VirtualKeyCode,
keyStruct.ScanCode,
keyStruct.Flags,
keyStruct.Time,
keyStruct.ExtraInfo,
key);
GlobalKeyPressed.Invoke(null, keyEventArgs);
handled = handled || keyEventArgs.Handled;
}
}
// raise KeyUp
if (GlobalKeyUp != null && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
{
var keyEventArgs = new GlobalKeyEventHandlerArgs(
keyStruct.VirtualKeyCode,
keyStruct.ScanCode,
keyStruct.Flags,
keyStruct.Time,
keyStruct.ExtraInfo,
null);
GlobalKeyUp.Invoke(null, keyEventArgs);
handled = handled || keyEventArgs.Handled;
}
}
//if event handled in application do not handoff to other listeners
if (handled)
{
return(-1);
}
//forward to other application
return(CallNextHookEx(_windowsKeyboardHookHandle, nCode, wParam, lParam));
}