键盘记录的C++实现，以及SMTP的C++实现，。程序通过系统钩子函数捕获键盘输入，通过SMTP协议以邮件方式发送到邮箱,Record keyboard the C++ implementation, as well as SMTP implementation of the C++,. Process through the system keyboard hook function to capture, through the SMTP protocol to send messages