Chatter-jee Client and Server send data to each other by making use of Message Packet only. The data is transmitted across the network using TCP/IP Stream Sockets.
Along with other relevent data, the client and server send a Reason Flag in each message. Depending on this Reason Flag, the receiver of the message decides its next action. So following a strict protocol for sending the correct Reason Flag is very important in this application.
Reason flags are nothing but MFC CString objects. Below is given the list of various Reason Flags:
Reason Flag | Meaning |
L | Login Request |
R | Registration Request |
M | Sending Message to Other User |
SL | Logged in. Send me Friend's list |
SLO | Logged in and Got Friend's list. Now send me Offline Messages |
ON | Send me the Next Offline Message |
X | Logoff Request |
AF | Trying to Add a Friend |
AFA | Added Friend has given permission to be added, and also added the requester as his friend |
AFJ | Added Friend has given permission to be added, but hasn't added the requester as his friend |
AFD | Added Friend has refused permission to be added |
C | Change Password Request |
DF | Delete Friend(s) Request |
BUP | Block a User Permanently |
BU | Block a User as long as I am logged in |
BUL | Send me the list of users Blocked by me |
BUR | Remove some User ids from my Blocked users list |
Reason Flag | Meaning |
Z | Server is Shutting Down |
ZX | Administrator has logged you off |
SL | Login is successful |
SLU | Logged in complete at server end and received Friend's list |
SR | Registration request successful |
SM | Got a message from another user |
SN | Some other user has come online |
SX | Some other user has gone offline |
SFA | Someone wants to add you as a friend and has sent a message for it. |
SFN | Someone has accepted your request to be added as a friend, and is presently online |
SFX | Someone has accepted your request to be added as a friend, but is presently offline |
SC | Password change is successful |
SD | Removal of chosen user ids from your friends list is successful |
SB | Removal of chosen user ids from your blocked users list is successful |
SO | An offline message received |
SOL | Last offline message received |
SB | Blocked users list is received |
F* | Any kind of failure |