How to create a bmp file and write an array of bytes there?

Question

Qt

The bytes are stored in a QByteArray
Option to create a .bmp file using QFile successfully creates a file, but when opening such a file, an error occurs
"BMP image has bogus header data"

QFile newDoc("fileName.bmp");

    if(newDoc.open(QIODevice::WriteOnly)){
        newDoc.write(image_byte);
    }

Another option does not create a file

QImage image;
         QByteArray ba;
         QBuffer buffer(&ba);
         buffer.open(QIODevice::WriteOnly);
         image.save(&buffer, "PNG");

QImage img;
        img.loadFromData(image_byte);
        QPixmap px = QPixmap::fromImage(img);
        img.save("my_image","BMP");

The bytes in the array are taken from the XML

if(domElement.tagName() == "image"){
                image_byte.append(domElement.text());

Answer 1

Do these bytes even represent a valid bmp with a header? Or is it just pixels?