set QPixmap to texture

[saman_artorious]

I receive a byte array which contains PNG file from network. I need to set this to a pixmap and set it as a texture to my QGlWidget. As I run the program below, pixmap is in debug mode and does not contain anything. However, bytes contains the whole byte array received from network.

void MainWindow::dataFromServer(QByteArray bytes)
{
//    QByteArray bytes;
    QBuffer    buffer(&bytes);
 
    QPixmap pixmap;
//    pixmap = QPixmap::grabWidget(this);
 
    buffer.open(QIODevice::WriteOnly);
 
    pixmap.save(&buffer, "PNG"); // writes pixmap into bytes in PNG format
 
    emit sendPixmapToWidget(pixmap);
}

void MainWindow::dataFromServer(QByteArray bytes)
{
//    QByteArray bytes;
    QBuffer    buffer(&bytes);

    QPixmap pixmap;
//    pixmap = QPixmap::grabWidget(this);

    buffer.open(QIODevice::WriteOnly);

    pixmap.save(&buffer, "PNG"); // writes pixmap into bytes in PNG format

    emit sendPixmapToWidget(pixmap);
}

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and here I set the pixmap to texture:

void GlWidget::pixmapCatchFromForm(QPixmap pixmap) {
 
deleteTexture(texture);
// image->loadFromData(bytes, "PNG");
 
texture = bindTexture(pixmap);
 
qDebug() << texture; // returns 1
 
updateGL();
}

void GlWidget::pixmapCatchFromForm(QPixmap pixmap) {

deleteTexture(texture);
// image->loadFromData(bytes, "PNG");

texture = bindTexture(pixmap);

qDebug() << texture; // returns 1

updateGL();
}

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[stampede]

void MainWindow::dataFromServer(QByteArray bytes)
{
//    QByteArray bytes;
    QBuffer    buffer(&bytes);
 
    QPixmap pixmap;
//    pixmap = QPixmap::grabWidget(this);
 
    buffer.open(QIODevice::WriteOnly);
 
    pixmap.save(&buffer, "PNG"); // writes pixmap into bytes in PNG format
 
    emit sendPixmapToWidget(pixmap);
}

void MainWindow::dataFromServer(QByteArray bytes)
{
//    QByteArray bytes;
    QBuffer    buffer(&bytes);
 
    QPixmap pixmap;
//    pixmap = QPixmap::grabWidget(this);
 
    buffer.open(QIODevice::WriteOnly);
 
    pixmap.save(&buffer, "PNG"); // writes pixmap into bytes in PNG format
 
    emit sendPixmapToWidget(pixmap);
}

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"I just got a new image data, I will create a buffer from it. Now, I will take empty image and write it over that buffer. Finally, I will send that empty image."
Do you know where is the problem ?

[saman_artorious]

how to do the vice versa? I mean how to write the buffer to empty image? I don't think I need to use a buffer instead simple doing:

QPixmap pixmap(bytes.data());
 
    qDebug() << pixmap.size();

QPixmap pixmap(bytes.data());

    qDebug() << pixmap.size();

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may suffice. but again, the value of pixmap here is inaccessible and size prints (0, 0)!

[stampede]

QPixmap::loadFromData