用于截获键盘信息的钩子程序，VC编写，使用方法为先编译LaunchDLL，然后把LaunchDLL.h和LaunchDLL.lib复制到KeyHook工程目录中，LaunchDLL.dll复制到Debug目录下-For information intercepted keyboard hook procedure, VC prepared to use the compiler for the first LaunchDLL, and then copied to LaunchDLL.h and