How to load an image in a QPixmap to display it in a QLabel

Question

I've read multiple article on it and it still does'nt work!!

I know I'm doing it right, but for some reason it does'nt work.

Here's my code :

myIcon = new QLabel();
    QPixmap myPixmapForNow;
    if(!myPixmapForNow.load(":/img/Interrogation.png")){
        qWarning("Failed to load");
    }
    myIcon->setPixmap(myPixmapForNow);

It tells me that the file failed to load each time.

What i want to do with this is to display an image that will have a tooltip and explain what the button next to it does. Basicaly, I'm looking for a way to display an image that have a tooltip programmed in it.

I'm a beginner and honestly the concept of looking in folders is a bit abstract for me. If you have a blog or something to propose, i'll be willing to read it. I've been looking for one and I have'nt found any good one that explain the concept and how to do it.

If you have a solution for my problem please explain it. Nothing better than explanation :)

Thanks

Solution

Two things to do:

1. Check if QFile can open that resource and read it. Dump it out to a file on disk.

   QFile fi(":/img/Interrogation.png");
   QFile fo(QDir::homePath() + QDir::separator() + "Interrogation.png");
   if (!fi.open(QIODevice::ReadOnly)) {
     qWarning() << "Can't open the resource" << fi.fileName();
     return;
   }
   if (!fo.open(QIODevice::WriteOnly)) {
     qWarning() << "Can't open the output" << fo.fileName();
     return;
   }
   fo.write(fi.readAll());
   

2. Check the format of whatever is dumped out to disk to ensure that it's a valid png file. You can open it in an image editor, for example - just be sure to verify that the extension agrees with the contents. A valid JPEG file with .png extension will fail to load.