File Sending Problem

What i found out is that: i think i miss reading the first byte.

I tested out by sending a txt file to the PDA and retrieve it again through active sync. the first letter of the txt file is missing.

Can someone check my algorith.

int nBytesRead = sockClient.Receive(&dataLength, 4); // Getting the data length send from the server//
               
          byte* receivedData = new byte[dataLength];

          nBytesRead = 0;

          long dataLengthTemp = dataLength;

          MessageBox(_T("Checking data integrity!!!"));

          while (dataLength != nBytesRead) {
               int dataReadLen = sockClient.Receive(receivedData + nBytesRead, dataLength - nBytesRead);
               nBytesRead += dataReadLen;
          };
     
          sockClient.Receive(receivedData, dataLength);

          CFile destFile(readFile, CFile::modeCreate | CFile::modeWrite | CFile::typeBinary);
         
          destFile.Write(receivedData, dataLength);

Sorry for the trouble.. I have solve this problem thanx

You are not checking for a potential error in the Recieve call.  It can return SOCKET_ERROR, which I believe equates to -1

That loops looks a little funny.  I'd just use:

byte* p= receivedData;
int nBytesLeft= dataLength;
while( nBytesLeft > 0 ) {
        int nActual= sockClient.Receive(p,nBytesLeft);
        if (nActual == SOCKET_ERROR || nActual == 0) {
             // handke the error
        }
        nBytesLeft -= nActual;
};
(note: I did not verify the above code).  

If that is not the problem, then show the code that is sending the data.

-- Dan

u can ask for refund of points on community support

What was the problem?
-- Dan

Dear expert(s),

A request has been made to close this Q in CS:
https://www.experts-exchange.com/questions/20546050/Refuned.html

Without a response in 72 hrs, a moderator will finalize this question by:

 - Saving this Q as a PAQ and refunding the points to the questionner

When you agree or disagree, please add a comment here.

Thank you.

modulo

Community Support Moderator
Experts Exchange

There would be much more value in the PAQ if Students would take a few moments to describe what he did to solve the problem.  Lacking that, I'd recommend a simple delete.

Students, can you describe what you did to solve this problem?  Thanks!

-- Dan

When i send a txt file over .. the first text was missing, so i thought that i started reading at the wrong time.

sockClient.Receive(receivedData, dataLength);

when i replaced the above statemtent with

sockClient.Receive(receivedData+datalength+1, dataLength);

the space will moved to the length of the file + 1