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QTcpSocket *tcpSocket;
QDataStream readStream;
readStream.setDevice(tcpSocket);
connect(tcpSocket, &QIODevice::readyRead, [&](){
readStream.startTransaction();
char *Data;
readStream.readRawData(Data, 12);
if (!readStream.commitTransaction())
return;
// When get full package to do something.
});