For a file, how to obtain a QImage of the icon shown on explorer?

[lqsa]

No, I'm not talking about thumbnail images, I'm talking about file type icon or application icon if it's an exe.

[SGaist]

Hi,

You can try the technique described here.

[lqsa]

The same, pixmap is invalid.

I'm not sure if the problem is in icon.pixmap method, because the ip.icon returns something on icon, and when call icon.availableSizes(), it returns a list with two QSize, 24x24 and 32x32.

[hskoglund]

Hi, just tried something similar to your code on my Windows 7; I created an empty vanilla widgets app and added this to mainwindow.cpp:

#include "QHBoxLayout"
#include "QLabel"
#include "qdir.h"
#include "qfileiconprovider.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    auto b = new QHBoxLayout(ui->centralWidget);
    for (auto f : QDir("C:/Windows").entryInfoList(QDir::Files))
    {
        auto icon = QFileIconProvider().icon(f);
        auto l = new QLabel;
        l->setPixmap(icon.pixmap(icon.availableSizes().first()));
        b->addWidget(l);
    }
}

and got this:
works ok :-)

[lqsa]

I found it. The fileName was obtained from FileDialog, and it begins with file:///. After remove it, it works.

Thank you very much.

[JonB]

@lqsa
So OOI, your original call to QFileInfo info(fileName) did not indicate that the path was unacceptable?

[lqsa]

What method is used for this?

[JonB]

@lqsa
That's just the constructor. But afterwards info.exists() would be a start if the file is supposed to exist, and it's not finding it via file:/// or whatever you said. Or I presume something in the information in the QFileInfo can't be right if it can't find the file or get its correct information...

[lqsa]

Yes, info.exists() returns false if not finding it.

[JonB]

@lqsa So that was your clue to the original problem :)