memory leak?

lenna · #1 (**permalink**) 07-16-2005

Hi All,

my client server application can work in two modes:
1) one direction - only client sends msgs to server
2) two directions - server gives 'answers' to client.

when program run in the first mode it looks OK, but when server answers to client than client's application exit its operation after a short while. I am trying to find the problem but have some taugh time.

this is the function that reads the data in the client side (in which I have problems):

Code:


int TCPClient::readSocketData(int s,
              char *decodeUnifiedMsgForServer,			
              int n,			
	 bool& isMsg
             )
{
	int bcount;							int br;							
	bcount = 0;
	br = 0;
	while (bcount < n)					
	{
		if ((br = recv(s,decodeUnifiedMsgForServer,n-bcount,0)) > 0)
		{
			isMsg = true;
			bcount += br;							decodeUnifiedMsgForServer+= br;              
		}
		else if (br < 0)             /* signal an error to the caller */
		{
			return(-1);
		}
		else							             {
			return bcount;
		}
		//Y 17_04_05 -
		Sleep(0);
		//Y.
                   }
  return(bcount);
}

after buffer (decodeUnifiedMsgForServer) is filled by the function above I decode the data into the relevant data classes as follows:

Code:


void BrainControlComData::decodeMsg(char* decodeUnifiedMsgForServer)
{



	if(strlen(decodeUnifiedMsgForServer) == 0)			
             {
		char* error = "probably an error (see Q1 below)";
	}


	char* msg = decodeUnifiedMsgForServer;
	int size = 4;

	int lenCursorData;
	int lenManipData;
	int lenVzData;

//places 1 - 12 in msg are reserved for total size/ isEventMsg/ MsgID

	int Web_lenOfClass;					
// decode len of msg
	memcpy(&Web_lenOfClass, msg, size);
	int lenOfClass = ntohl(Web_lenOfClass);

	int Web_MsgID;						
// decode msg ID
	memcpy(&Web_MsgID, msg + MSG_ID_LOCATION, size);
	int msgID = ntohl(Web_MsgID);



	//Y 6_07_05 -
	int counter = 12;

	int len = 0;
	len = comData[CURSOR_DATA]->decodeMsg(msg + counter);
	counter += len;

	len = comData[STATE_DATA]->decodeMsg(msg);
}

the first 3 bytes in the buffer are integers (general data such as - total len, msgID etc.) and I decode them in the 2nd function. afterwards I send the buffer into specific data classes that decode the relevant data they need using the fuction decodeMsg.

my questions are as follows:

1) why is the length of the buffer (decodeUnifiedMsgForServer) is always 0 and not equals to the length of the msg received from server? I know that the data is received from the server because it is logged correctly, but still when I check length of msg it equas 0 (first 'if' in second function) - any ideas?

2) when I remarked the line that calls the decodeMsg the application 'behaved' OK and client didn't exit its operation. I think that this error has something to do with memory leak. maybe if I understood the first question I could understand this one as well.

Thank you so much for your help,
Lenna

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