目的：把vncserver从exe封装成dll，然后通过.NET程序提供的用户界面予以调用。环境：VNC Free Edition 4.1  + .NET 2.0。结果：为了实现定制地Disable Remote Input，在WH_KEYBOARD_LL的使用上出了点小问题。This hook is called in the context of the thread that installed it. The call is made by sending a message to the thread that installed the hook. Therefore, the thread that installed the hook must have a message loop. 我在消息循环里加了一个Sleep，导致程序行为异常，好一顿找。