TCP

[houmingc]

My server is not receiving data from my client.
Don't understand what does seek() do and why need 2object out and block at the same time.

Below is my code

@

            socket.connectToHost(ServerIP,10010);
            qint16 CRC;
            unsigned char TCPdata[5];
            TCPdata[0]=0x20;
            TCPdata[1]=0x20;
            TCPdata[2]=0x00;
            CRC =ModbusCRC((unsigned char*)TCPdata,3);



            QByteArray block;
            QDataStream out(&block,QIODevice::WriteOnly);
            out.setVersion(QDataStream::Qt_5_0);

            out.device()->seek(0);
            out<<0x20<<DeviceNum<<0x00<<CRC;

           socket.writeData(block.data(),block.size());

@

[SGaist]

Hi,

Please don't post the almost same question twice, closing this one

"Duplicate":http://qt-project.org/forums/viewthread/50953/