how sending and recieving file via serial port

[Alex22]

Hi,
I want to send a file via serial port (rs232) on a device to another device. Any idea for doing this by Qt?

[Alex22]

I think after setting some thing like baud rate, bit data, stop bits, parity and etc then i can use this code for sending file:

{ 
        QFile file(fileName);
        if (!file.open(QIODevice::ReadOnly)){
            qDebug() << "Open file fault";
            start(false);
            port->close();
            return;
        }
        QByteArray data = file.readAll();
        quint64 r = port->write(data);
        port->waitForBytesWritten(responseTimeout);
        port->waitForReadyRead(responseTimeout);
        cout<<r<<endl;
        if (r == quint64(data.size())) qDebug() << "Writed text file.";
        else qDebug() << "Bytes writed small: " << r;
    }

{ 
        QFile file(fileName);
        if (!file.open(QIODevice::ReadOnly)){
            qDebug() << "Open file fault";
            start(false);
            port->close();
            return;
        }
        QByteArray data = file.readAll();
        quint64 r = port->write(data);
        port->waitForBytesWritten(responseTimeout);
        port->waitForReadyRead(responseTimeout);
        cout<<r<<endl;
        if (r == quint64(data.size())) qDebug() << "Writed text file.";
        else qDebug() << "Bytes writed small: " << r;
    }

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how much mega bytes cab sent by serial port? and could i consider a checksum for sending and recieving all right?

[Lesiok]

Serial port can transfer any number of bytes - it is only a pipe. That you have to define a protocol and transmit the data in an orderly manner so that the recipient can interpret them correctly.

PS
An example protocol for file transfer is xmodem or zmodem.