/// <summary>
/// Low-level keyboard hook procedure.
/// The system calls this function every time a new keyboard input event
/// is about to be posted into a thread input queue. The keyboard input
/// can come from the local keyboard driver or from calls to the
/// keybd_event function. If the input comes from a call to keybd_event,
/// the input was "injected". However, the WH_KEYBOARD_LL hook is not
/// injected into another process. Instead, the context switches back
/// to the process that installed the hook and it is called in its
/// original context. Then the context switches back to the application
/// that generated the event.
/// </summary>
/// <param name="nCode">
/// The hook code passed to the current hook procedure.
/// When nCode equals HC_ACTION, it means that the wParam and lParam
/// parameters contain information about a keyboard message.
/// </param>
/// <param name="wParam">
/// The parameter can be one of the following messages:
/// WM_KEYDOWN, WM_KEYUP, WM_SYSKEYDOWN, or WM_SYSKEYUP.
/// </param>
/// <param name="lParam">Pointer to a KBDLLHOOKSTRUCT structure.</param>
/// <returns></returns>
/// <see cref="http://msdn.microsoft.com/en-us/library/ms644985.aspx"/>
///
private bool SetGlobalLLKeyboardHook()
{
// Create an instance of HookProc.
globalLLKeyboardHookCallback = new HookProc(this.LowLevelKeyboardProc);
hGlobalLLKeyboardHook = WindowsAPI.SetWindowsHookEx(HookType.WH_KEYBOARD_LL, globalLLKeyboardHookCallback, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
return(hGlobalLLKeyboardHook != IntPtr.Zero);
}
/// <summary>
/// Set global low-level mouse hook
/// </summary>
/// <returns></returns>
private bool SetGlobalLLMouseHook()
{
// Create an instance of HookProc.
globalLLMouseHookCallback = new HookProc(this.LowLevelMouseProc);
hGlobalLLMouseHook = WindowsAPI.SetWindowsHookEx(
HookType.WH_MOUSE_LL, // Must be LL for the global hook
globalLLMouseHookCallback,
// Get the handle of the current module
Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),
// The hook procedure is associated with all existing threads running
// in the same desktop as the calling thread.
0);
return(hGlobalLLMouseHook != IntPtr.Zero);
}