minghust / mingssager

An IM software, based on winsock and Qt network

mingssager

Requirements

Implement an instant messaging software based on TCP and UDP:

1. Include both server-side and client-side;
2. Support user registration, login, and password retrieval (based on TCP);
3. If two users are online at the same time, use p2p to communicate without being transited by the server (based on TCP);
4. Support p2p reliable file transfer (base on UDP);
5. The data stored on the server are strongly encrypted;
6. Support at least two groups of users to communicate and transfer files online at the same time;
7. File transfer shows good performance with full use of network bandwidth;
8. User-friendly GUI.

Implement

based on Qt and winsock, almost use one month to finish this huge software

• Environment : Windows 10
• Qt : qt 5.9

Features

• server
  • winsock
  • I/O multiplexing: select
  • file Information
• client
  • QTcpSocket
  • QUdpSocket
  • QTcpServer

Methods for reliable file transmission(based on UDP)

• Timeout
• md5
• GBN
• Qt signal and slot