const WM_UNSUBCLASS = WM_USER 2001// Uninstall subclass of news WM_SENDDATA = WM...

代码说明：

const WM_UNSUBCLASS = WM_USER + 2001 //卸载子类化消息 WM_SENDDATA = WM_USER + 2003 //收到要发送新数据包的消息 type PMyDLLVar = ^TMyDLLVar //用来共享的内存数据结构 TMyDLLVar = record SubClass: Boolean //是否已经子类化 HookWindow, SpyWindow: LongWORD //要安装HOOK的窗口及用于接收消息的窗口 hHook: LongWORD //HOOK句柄 OldWndProc: pointer //旧的窗口过程 end-const WM_UNSUBCLASS = WM_USER 2001// Uninstall subclass of news WM_SENDDATA = WM_USER 2003// received new data to be sent information packets type PMyDLLVar = ^ TMyDLLVar// used to share memory data structure TMyDLLVar = record SubClass : Boolean// if the child class of HookWindow, SpyWindow : LongWORD// HOOK to install a window for receiving news and the window hHook : LongWORD// handle OldWndProc HOOK : pointer// old process end window