Question

I’m trying to extract icon from exe file using WinAPI, but it doesn’t work.

Here’s the code:

QIcon OSTools::AppsInterface::extractAppIcon(const QString &fileName) const {
    wchar_t *convertedName = new wchar_t[fileName.length() + 1];
    fileName.toWCharArray(convertedName);
    convertedName[fileName.length()] = '\0';
    HICON Icon = ExtractIcon(NULL, convertedName, 0);

    QPixmap pixmap = QPixmap::fromWinHICON(Icon);
    return QIcon(pixmap);
}

Code outputs:

QPixmap::fromWinHICON(), failed to GetIconInfo()

(ExtractIcon function on MSDN).

I think problem is that I send NULL instead of “A handle to the instance of the application calling the function“. But, generally, I use Qt, and it’s only one WinAPI function in my app.

What’s wrong? What’s correct way to extract icon using WinAPI? If you have another function proposal, please, give me an example. This is the first time I’m using WinAPI.

UPDATE: Yes, there is a better way. You may use QFileIconProvider class for doing such things.

Answer 1

And solution was very simple. I just sent path to ‘.lnk’ file instead of path to file. That’s my inattention.