c++ qt: convert read() char array to 16bit signed integer

I want to read in from an 16bit integer wave audio file with qt.

    char tempbytes[3]; /// 

´   QFile file(QString::fromStdString(sourcepath));

if(!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
    qWarning() << "Audio::readsamples: Cannot open File" << QString::fromStdString(source);
    return;
}

file.seek(120);
file.read(tempbytes, 2);   

now i have a char array but i want to cast it to an 16 bit signed integer value. The byte order in wave files is littleendian.

I already tried:

sample = qFromLittleEndian<qint16>((uchar*)tempsamples);

This worked for some samples but some were misinterpreted!

Can you help me how to do this?