/// <summary>
/// Safely removes the hook without throwing exception.
/// </summary>
private void SafeRemove()
{
if (this._hKeyboardHook != IntPtr.Zero)
{
UnsafeNativeMethods.UnhookWindowsHookEx(this._hKeyboardHook);
this._keyboardProc = null;
this._hKeyboardHook = IntPtr.Zero;
this._keyData = Keys.None;
this.OnStateChanged(new WindowsHookLiba.StateChangedEventArgs(this.State));
}
}
/// <summary>
/// Removes the keyboard hook for this application.
/// </summary>
public void RemoveHook()
{
if (this._hKeyboardHook != IntPtr.Zero)
{
if (!UnsafeNativeMethods.UnhookWindowsHookEx(this._hKeyboardHook))
{
// Failed to remove the hook. Throw a HookException
int eCode = Marshal.GetLastWin32Error();
throw new WindowsHookException(new Win32Exception(eCode).Message);
}
else
{
this._keyboardProc = null;
this._hKeyboardHook = IntPtr.Zero;
this._keyData = Keys.None;
this.OnStateChanged(new WindowsHookLiba.StateChangedEventArgs(this.State));
}
}
}
/// <summary>
/// Installs the keyboard hook for this application.
/// </summary>
public void InstallHook()
{
if (this._hKeyboardHook == IntPtr.Zero)
{
this._keyboardProc = new KeyboardHook.KeyboardMessageEventHandler(KeyboardProc);
IntPtr hinstDLL = Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]);
this._hKeyboardHook = UnsafeNativeMethods.SetWindowsHookEx(UnsafeNativeMethods.WH_KEYBOARD_LL, this._keyboardProc, hinstDLL, 0);
if (this._hKeyboardHook == IntPtr.Zero)
{
// Failed to hook. Throw a HookException
int eCode = Marshal.GetLastWin32Error();
this._keyboardProc = null;
//throw new WindowsHookException(new Win32Exception(eCode).Message);
}
else
{
this.OnStateChanged(new WindowsHookLiba.StateChangedEventArgs(this.State));
}
}
}
