C / C++ / MFC

Nishad S9-Mar-09 3:27

9-Mar-09 3:27

That is something with Datagram Sockets...

- ns ami -

Code-o-mat9-Mar-09 2:58

9-Mar-09 2:58

Whoups, sorry, of course i wanted to answer himangshuS, didn't notice i "mis-clicked". Frown | :(

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Nishad S9-Mar-09 3:07

9-Mar-09 3:07

Code-o-mat wrote:
sorry

No problem... Smile | :)

It was just to inform you...

- ns ami -

hrishiS9-Mar-09 2:56

9-Mar-09 2:56

Oh ya, that sounds pretty interesting and realistic.
But I was thinking that...why do i need a server,can i communicate directly(client to client)?
May the server can give a list of information with IP address and username,thats it. Then the clients can talk to each other directly(not through the server). Is that possible?

regards,
HImangshu S

I am a beginner

Code-o-mat9-Mar-09 3:00

9-Mar-09 3:00

Yes, that is possible.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

hrishiS9-Mar-09 3:05

9-Mar-09 3:05

fine, so i guess i can go ahead a simple client-client design with a limited server application which will send to the client for the IP-username mapping.

But, here again i need to maintain some table structure. I am new to MFC. can I use ms access here?

I am a beginner

Code-o-mat9-Mar-09 3:13

9-Mar-09 3:13

I think you can but i have never worked with access so i can't help you with it.
Plan your chat-protocol carefully, remember that your clients will probably need to be notified of certain events like someone going offline or coming online...

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

hrishiS9-Mar-09 3:29

9-Mar-09 3:29

oh ya that could be also one more problem. I haven't thought about it only.
But I guess we can broadcast a special message(going offline) to all. Instead of events notifications.
Am I correct?

I am a beginner

Code-o-mat9-Mar-09 3:44

9-Mar-09 3:44

How would you broadcast that?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

Eytukan9-Mar-09 3:17

Re: sockets in MFC [modified]

9-Mar-09 3:17

Let me explain you that one,

1.Do not start with Dialog or Doc/View conversation. First think about implementing your chat/messaging mechanism. I guess you have been coming around MFC sockets. If you ask me, I'm not for it.I did not like to work with it. You can directly use winsock2.

2. Write a simple TCP client server application in console mode. Once you find the application running and you are clear with the idea, make a simple class that takes care of simple functionalities like connecting, sending & accepting messages.

3. First try for single client-server application. When you are comfortable with it you can move to Multi-client application that would involve threading in most cases.

4. Now you are clear with Sending & receiving messages using winsock.

5. For server part, you can ultimately go for windows services implementation, but to start with I do not recommend it. Because as you are a beginner, you will have to trouble shoot a lot of things at first. So just make it a console server. Where you'll be able to view the messages going across.

6. For client, you can have it as Dialog application, but again it's just based on the need. You can even go for SDI if you want to make use of Serialize-Archive functionality of the document. It could be useful when you save down your chat conversation.

7. Did I answer you?

He never answers anyone who replies to him. I've taken to calling him a retard, which is not fair to retards everywhere.-Christian Graus

hrishiS9-Mar-09 3:26

9-Mar-09 3:26

A sincere thanks for your reply
Got lots idea from you.Specially the steps i should follow. it sounds very professional.

VuNic wrote:
You can directly use winsock2.

what is winsock2? is it for MFC? is there any advantage on normal socket functions like listen/bind/createsocket etc (which I have worked on little bit).

I am a beginner

modified on Monday, March 9, 2009 9:34 AM

Eytukan9-Mar-09 3:38

9-Mar-09 3:38

himangshuS wrote:
what is winsock2? is it for MFC? is there any advantage on normal socket functions like listen/bind/createsocket etc (which I have worked on little bit).

lol. winsock is called - normal sockets. MFC just wraps around. You will get better understanding if you go for winsock API. I don't force you to leave MFC, but that's not my choice when it comes to sockets. Nishant Shivakumar has a neatly written TCP client server application. I'd recommend you to start with that. wait let me check it.

He never answers anyone who replies to him. I've taken to calling him a retard, which is not fair to retards everywhere.-Christian Graus

Eytukan9-Mar-09 3:42

9-Mar-09 3:42

Clikt[^]

He never answers anyone who replies to him. I've taken to calling him a retard, which is not fair to retards everywhere.-Christian Graus

hrishiS9-Mar-09 3:48

9-Mar-09 3:48

thnaks
could you please tell me if my design is correct.

server
->Maintains a list of Ip_Address-user. Always in listen mode, so that if someone ask for the list it sends it.
-> If the admin adds a new user, he will re-send the list to all (but I am not sure, how to do it,when if the clients are busy sending message. should i restart all or do something)

client
-> on boot/application start, it request server and get the list(His IP-username should be present in the list). And sends a message that he is online to all.
->if he goes offline- he will notify everyone and the go offline.

so basically only those people who are listed in the server by admin can only chat

Eytukan9-Mar-09 4:00

9-Mar-09 4:00

Your questions are at times too open & wide. Sigh | :sigh:

Try with simple implementation, once you get the picture you can design your complete application.

He never answers anyone who replies to him. I've taken to calling him a retard, which is not fair to retards everywhere.-Christian Graus

SandipG 9-Mar-09 3:21

SandipG

9-Mar-09 3:21

This article Chat Client/Server[^] might help you to get started.

Regards,
Sandip.

Eytukan9-Mar-09 3:44

Re: sockets in MFC [modified]

9-Mar-09 3:44

lol the author of that article has taken screen shots of those widows with his junk desktop on the background!

He never answers anyone who replies to him. I've taken to calling him a retard, which is not fair to retards everywhere.-Christian Graus

ShiXiangYang9-Mar-09 20:50

ShiXiangYang

9-Mar-09 20:50

I have just write some code for your question. I hope it will give you any help.But I cannt submit one article. Can you tell me your E-mail? I will send to you.

modified on Tuesday, March 10, 2009 3:30 AM

hrishiS9-Mar-09 21:45

problem in strcat function

9-Mar-09 21:45

oh thanks a lot....
himangshu_802@yahoo.co.in

I am a beginner

raj15769-Mar-09 2:09

raj1576

9-Mar-09 2:09

when i m use strcat function to concatinate the two string then it gives the garbage value before the string.

i m concatinate this

//find window path-----------
char SystemDir[255];
GetSystemDirectoryA(SystemDir,sizeof(SystemDir));
MessageBox(SystemDir,"path of exe1",NULL);

char exename[20] = "\\wmvcopy.exe";
strcat(SystemDir,exename);
MessageBox(SystemDir,"path of exe3",NULL);

//clip in path---------------------
char sPath[MAX_PATH]="c:\\media\\system.wmv";

char varinput[10] = " -i ";
strcat(varinput,sPath);
//strcat(varinput,varslash);
MessageBox(varinput,"open path",NULL);

//clip save path-------------------
char varoutput[100] = " -o ";
char savePath[MAX_PATH];
strcpy(savePath, savemoviename);
strcat(varoutput,savePath);
MessageBox(varoutput,"save path",NULL);
//MessageBox(varinput,"varinput1",NULL);
//Start time------------------------

char varstart[100] = " -p ";
char tstart[25];
sprintf(tstart,"%d",posisecond);
strcat(varstart,tstart);

MessageBox(varstart,"varstart",NULL);
//end time--------------------------
//endposisecond

//duration of clip--------------------
int totalduration = endposisecond - posisecond;
char tdur[25];
char vardur[100] = " -d ";
sprintf(tdur,"%d",totalduration);
strcat(vardur,tdur);
MessageBox(vardur,"duration",NULL);

char cmdpath[MAX_PATH];
strcat(cmdpath,SystemDir);
strcat(cmdpath,varinput);
strcat(cmdpath,varoutput);
strcat(cmdpath,varstart);
strcat(cmdpath,vardur);
MessageBox(cmdpath,"cmdpath",NULL);

Cedric Moonen9-Mar-09 2:12

Cedric Moonen

9-Mar-09 2:12

rajeshkumarrajput wrote:
char cmdpath[MAX_PATH];
strcat(cmdpath,SystemDir);

Of course: cmdpath contains garbage because you didn't write anything into it. So, if you try to append something to it, the garbage will be kept. Replace the first strcat by a strcpy, this way you first copy something useful in the string, then you can append things after it.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Nishad S9-Mar-09 2:13

9-Mar-09 2:13

rajeshkumarrajput wrote:
char cmdpath[MAX_PATH];
strcat(cmdpath,SystemDir);

Make char cmdpath[MAX_PATH] = "";

Btw, you can have a look at PathXXX functions.

- ns ami -

raj15769-Mar-09 2:16

raj1576

9-Mar-09 2:16

thanks it works

Nishad S9-Mar-09 2:19

9-Mar-09 2:19

You are welcome... but I was just pointing out what is wrong. Cedric Moonen's answer is more correct... Smile | :)

- ns ami -