QByteArray conversion to char (not char* or constChar*)

Question

I have an issue which has been bugging for over an hour and decided just to ask here. Is there a proper way of converting a QByteArray to a char? I managed to get it working as char* but I need to pass it as a char.

Here is a code bit where I take the qbytearray and convert it to char*:

    QByteArray MainWindow::checkSum(QByteArray &b)
    {
        qint16 b_len = b.length();

        char xor = 0;

        for ( int i = 0 ; i < b_len ; i ++ )
        {
           xor = xor ^ b[i];
        }

        return b;
    }

    void MainWindow::on_flipHorzButton_clicked()
    {
         // getFirmwareVersion = { 0xe6, 0x05, 0x12, 0x00}
         QByteArray str;

         char ch = checkSum(str).data();

         str[0] =0xaa;
         str[1] =0xbb;
         str[2] =0xcc;
         str[3] =0xdd;
         str[4] = ch;
         printf("%s", str[4]);
         serial.write(str, 5); 
}

Should I try to convert ch to char? If yes, how should I do it?

Answer 1

For some reason I had to rename "xor" to something else.

For your specific problem, you have to change that line :

char ch = checkSum(str).data()[0];

So that it returns the first character of the char* from the QByteArray