CODEWITHSUNDEEP
c++qt
SamSong
SamSong

Reputation: 69

How to extract integers from a QByteArray in Qt using toInt?

I am a beginner with C++ and Qt. The data sent is a string of ASCII characters ex:"jdlsfjffjf: XX" where I would like to extract the number XX. I know I should possibly use indexof to point to it but not sure how. Any direction? Here's the server side code that receives, displays and writes. I get the correct numbers in the application but gibberish characters in the file I'm writing to. 

void Receiver::processPendingDatagrams()
    {
        while (udpSocket->hasPendingDatagrams()) {
            QByteArray datagram; //array of bytes
            datagram.resize(udpSocket->pendingDatagramSize()); //size it depending on sent data
            udpSocket->readDatagram(datagram.data(), datagram.size()); //read all
            statusLabel->setText(tr("%1 C").arg(datagram.data()));


            //writing stream to file
            bool ok;
            QFile file("file.dat");
            file.open(QIODevice::WriteOnly);
            QDataStream out(&file);   
            out << datagram.toInt(&ok, 10 );        
    }

Upvotes: 3

Views: 1435

Answers (1)

sithereal
sithereal

Reputation: 1686

int num = datagram.right(datagram.size() - datagram.indexOf(':') - 1).toInt();

Upvotes: 5

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