看下这个函数
bool MySocket::reciveMsg(int socket, std::string& s, bool *eof)
{
    const int READ_SIZE = 4096;   // Number of bytes to attempt to read at a time
    char readBuf[READ_SIZE];
    
    bool wouldBlock = false;
    *eof = false;
    
    while ( ! wouldBlock && ! *eof) {
        int n = recv(socket, readBuf, READ_SIZE-1, 0);
        if (n > 0) {
            readBuf[n] = 0;
            s.append(readBuf, n);
        } else if (n == 0) {
            *eof = true;
        } else if (GetError()) {
            wouldBlock = true;
        } else {
            return false;   // Error
        }
    }
  return true;
}

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http://topic.csdn.net/u/20111129/22/737b7a52-417b-4aae-865e-425a9b87b59d.html


------解决方案--------------------
StreamReader 这个类专门就干这事的。如果你想自己反编译一下看看源码。我觉得蛮复杂的。