Bitwise shifting and ORing HexaDecimal Value

[ChrisW67]

You kept saying you wanted to obtain a set of 16 bit integers. You can convert these to a hex string int by int: there is no toHex() method in QList, and there is no QByteArray involved.

There are a lot of ways to do things vaguely like your request but you have to actually understand what you are trying to achieve and know some basic programming.

QList<quint16> result;  // A list of 16 bit unsigned integers
for (int i = 0; i < ba.size(); i+=2)
  result.append( (static_cast<unsigned char>(ba.at(i) << 5)) | static_cast<unsigned char>(ba.at(i+1)) );
// You now have a list of 16 bit ints like you requested.
 
// If you wanted only a hex string
QString hex;
for (int i = 0; i < ba.size(); i+=2) {
  quint16 r = static_cast<unsigned char>(ba.at(i) << 5)) | static_cast<unsigned char>(ba.at(i+1);
  result += QString(%1").arg(r, 4, 16, '0' );  // watch out for byte order if this needs to be portable
}

QList<quint16> result;  // A list of 16 bit unsigned integers
for (int i = 0; i < ba.size(); i+=2)
  result.append( (static_cast<unsigned char>(ba.at(i) << 5)) | static_cast<unsigned char>(ba.at(i+1)) );
// You now have a list of 16 bit ints like you requested.

// If you wanted only a hex string
QString hex;
for (int i = 0; i < ba.size(); i+=2) {
  quint16 r = static_cast<unsigned char>(ba.at(i) << 5)) | static_cast<unsigned char>(ba.at(i+1);
  result += QString(%1").arg(r, 4, 16, '0' );  // watch out for byte order if this needs to be portable
}

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Given that you already have the data in a buffer, and the result will be exactly the same size as the source data, then you could have done the job in-situ with a bit of thought:

// char *buff
// int numbytes
for (int i = 0; i < numbytes; i+=2) {
    unsigned char a = static_cast<unsigned char>( buff[i] );
    unsigned char b = static_cast<unsigned char>( buff[i+1] );
    buff[i] = a >> 3;
    buff[i+1] = a << 5 | b;
}

// char *buff
// int numbytes
for (int i = 0; i < numbytes; i+=2) {
    unsigned char a = static_cast<unsigned char>( buff[i] );
    unsigned char b = static_cast<unsigned char>( buff[i+1] );
    buff[i] = a >> 3;
    buff[i+1] = a << 5 | b;
}

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