QByteArray of char* to QString

MScottM

Here is my code:

//snip
if(busOn){
        long id;
        QString l;            
        QString canMessage;           
        unsigned char data[8];
        unsigned int dlc, flags;
        unsigned long timestamp;

        canStatus status = canReadWait(canHandle, &id, data, &dlc, &flags, &timestamp, 100);

         QByteArray msgData = QByteArray((char*)data, 8);
        
        if (status == canOK){
            QTextStream(&l) << QString("%1").arg(id, 8, 16, QLatin1Char( '0' )) << msgData;
        }
        m_ui->textEditCanIn->append(l);
            if (canMessage != "") {
                qDebug() << canMessage;
                //emit canMessageOut(canMessage);
            }

The debug statement at the end prints out this:
"18ff0301\u0004\u0000\u0000\u0000\u0000\u0000\u0000\u0000"

The first part of the message is fine (the message ID), and the second part contains the data I expect to see (struggled for a bit to get there), but I need to put it into a QString format like this:
"18ff0301[0x]0400000000000000"

so I can send it to another function for processing (the emit canMessageOut). I've been struggling with how to format the message and having no luck converting a QByteArray of char* to a QString.

Christian Ehrlicher

If you want to show the content of the byte array as hex values so the user can read it, then you should use toHex()

MScottM

Hi @Christian-Ehrlicher ,

I tried this:

QByteArray msgData = QByteArray(data).toHex();

(had to change from unsiged char to char)

but then the debug statement prints nothing for the data (only the ID):

"18ff0301"

Christian Ehrlicher

@MScottM said in QByteArray of char* to QString:

but then the debug statement prints nothing for the data

Because now you don't pass the size of your char* array to the QByteArray ctor.

MScottM

Dang, that was it. I swear I tried that yesterday, but I probably had it wrong as I was tired and throwing code around trying to make it work.

Thanks once again for the help!

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