private KeyboardHook()
{
HookType = HookTypeID.WH_KEYBOARD_LL;
Win32Helper.GetKeyboardState(this._keyState);
DisableDevice = false;
ExceptKeys = new List <Keys>();
}
/// <summary>
/// 键盘钩子处理函数
/// </summary>
/// <param name="nCode"></param>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <returns></returns>
/// <remarks>此版本的键盘事件处理不是很好,还有待修正.</remarks>
protected override int HookProc(int nCode, Int32 wParam, IntPtr lParam)
{
if (log.IsDebugEnabled)
{
log.Debug(String.Format("Captured key press. code {0}, wparam {1}, lparam {2}.", nCode, wParam, lParam));
}
//Disable keyboard.
if (DisableDevice)
{
bool notExceptKey = true;
if (nCode >= 0)
{
KeyboardHookStruct keyStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
Keys keyData = (Keys)keyStruct.VKCode;
foreach (Keys key in ExceptKeys)
{
if (key.Equals(keyData))
{
if (log.IsDebugEnabled)
{
log.Debug(String.Format("Captured hot key '{0}' when disable keyboard press.", keyData));
}
notExceptKey = false;
break;
}
}
}
if (notExceptKey)
{
return(1);
}
}
bool handled = false;
//it was ok and someone listens to events
if (nCode >= 0)
{
KeyboardHookStruct keyStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
//raise KeyDown
if (OnKeyDown != null && (wParam == (int)WM_KEYBOARD.WM_KEYDOWN || wParam == (int)WM_KEYBOARD.WM_SYSKEYDOWN))
{
Keys keyData = (Keys)keyStruct.VKCode;
KeyEventArgs e = new KeyEventArgs(keyData);
this.OnKeyDown(this, e);
handled = handled || e.Handled;
}
// raise KeyUp
if (this.OnKeyUp != null && (wParam == (int)WM_KEYBOARD.WM_KEYUP || wParam == (int)WM_KEYBOARD.WM_SYSKEYUP))
{
Keys keyData = (Keys)keyStruct.VKCode;
KeyEventArgs e = new KeyEventArgs(keyData);
this.OnKeyUp(this, e);
handled = handled || e.Handled;
}
// raise KeyPress
if (this.OnKeyPress != null && wParam == (int)WM_KEYBOARD.WM_KEYUP)
{
bool isDownShift = false, isDownCapslock = false;
try {
isDownShift = ((Win32Helper.GetKeyStates(VK_SHIFT) & 0x80) == 0x80 ? true : false);
isDownCapslock = (Win32Helper.GetKeyStates(VK_CAPITAL) != 0 ? true : false);
} catch {
//
}
byte[] keyState = new byte[256];
Win32Helper.GetKeyboardState(keyState);
byte[] inBuffer = new byte[2];
int result = Win32Helper.ToAscii(keyStruct.VKCode, keyStruct.ScanCode, keyState, inBuffer, keyStruct.Flags);
if (log.IsDebugEnabled)
{
log.Debug(String.Format("Key converting result is '{0}'", result));
}
if (result == 1)
{
char key = (char)inBuffer[0];
if ((isDownCapslock ^ isDownShift) && Char.IsLetter(key))
{
key = Char.ToUpper(key);
}
if (log.IsDebugEnabled)
{
log.Debug(String.Format("Captured key press '{0}'", key));
}
KeyPressEventArgs e = new KeyPressEventArgs(key);
this.OnKeyPress(this, e);
handled = handled || e.Handled;
}
}
}
//if event handled in application do not handoff to other listeners
if (handled)
{
return(1);
}
else
{
return(Win32Helper.CallNextHookEx(this._hook, nCode, wParam, lParam));
}
}