qt - QTcpSocket doesn't read everything -

i trying use cryptopp qtcpsocket, encrypt username on client side, send through tcpsocket, , decrypt server side. here problem, qtcpsocket doesn't read message, can see server side expecting receive several packets 1 cipher, read method says whole message read in char*, don't see really.... here code sending cipher :

char size[5]; sprintf(size,"%d{",crypted_mess.size());  int written = 0; written = socket->write(size); written = socket->write(crypted_mess.c_str(),crypted_mess.size()+ 1); socket->waitforbyteswritten(crypted_mess.size()); string recovered = t.discryptor(crypted_mess) ; 

and code decrypt (works fine client side without sending message) :

    if(paquet_missing_size == 0) {         current_message->clear();         was_read = socket->read(start_message,1000);          int message_start = 0;         while(start_message[message_start]!= '{')             message_start++;          char *size_total_string;         size_total_string = (char*)malloc (message_start * sizeof (char));          for(int j = 0 ;j < message_start;j++  ){             size_total_string[j] = start_message[j];         }          size_total_string[message_start] = '\0' ;         paquet_missing_size = atoi(size_total_string);         memcpy(read,start_message+message_start+1,was_read - message_start);     }     else         was_read = socket->read(read,1000);      // add read thing current_message     if(was_read <= paquet_missing_size) {         current_message->append(read, was_read);         paquet_missing_size -= was_read;     } else {         current_message->append(read, paquet_missing_size);         paquet_missing_size = 0;     } 

for purpose should use qbytearray qdatastream in order pass size of message first message.

hope help.