Winsock;  Remote fault diagnosis;  POP3;  SMTP;  RAS

The characteristics and practical engineering development examples of remote diagnosis of devices using Winsock combined with POP3 and SMTP protocols are expounded, and the Winsock and POP3 protocols and the remote fault diagnosis through the network to replace people running are introduced in detail. The implementation and programming of users under LAN access and Modem dial-up access are discussed. The whole system is implemented in the C++Builder language environment, the interactivity of the system is stronger than the web-based remote fault diagnosis, in the case of LAN access, the diagnostic center can dynamically interact with customers.