Windows Socket ioctlsocket question

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C++

DWORD RecvCount = 0;
 char szBuff1[2048];
 bool stop = false;
 while(!stop)
 {
     ioctlsocket(*socket, FIONREAD, &RecvCount);
     if(RecvCount > 1)
         stop = true;
 }
 int Res = recv(*socket, szBuff1, RecvCount,0);

so I found this code online and I was wondering if it is possible to make a function that dynamically sets RecvBufferSize to incoming data's size, I've tried to do on the code a bit but I did not manage to do it in a strange way, then message me sent to TCP server as results from ioctlsocket (* socket, FIONREAD, & RecvCount);
i really hope someone can help me with this