QDesktopServices to open resource file?

[wconstan]

Short Version

I have a resource file :/doc/foo.pdf that I'd like to open using QDesktopServices on OS X, Windows, and LINUX. I've tried various flavors of specifying the URL, e.g.,

QUrl url;
url.setScheme("qrc");
url.setUrl(":/docs/foo.pdf");
QDesktopServices::openUrl(url);

QUrl url;
url.setScheme("qrc");
url.setUrl(":/docs/foo.pdf");
QDesktopServices::openUrl(url);

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but nothing seems to work.

Q: Is it possible to use QDesktopServices to open a resource file and, if so, how?

LONG VERSION

The following works on OS X:

void MyClass::on_menuActionOpenManual_triggered()
{
    QUrl url(directoryOf("doc").absoluteFilePath("foo.pdf"));
    url.setScheme("file");
    QDesktopServices::openUrl(url);
}

void MyClass::on_menuActionOpenManual_triggered()
{
    QUrl url(directoryOf("doc").absoluteFilePath("foo.pdf"));
    url.setScheme("file");
    QDesktopServices::openUrl(url);
}

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where directoryOf() is defined as

QDir MyClass::directoryOf(const QString &subdir)
{
    QDir dir(QApplication::applicationDirPath());
 
#if defined(Q_OS_WIN)
    if (dir.dirName().toLower() == "debug"
            || dir.dirName().toLower() == "release")
        dir.cdUp();
#elif defined(Q_OS_MAC)
    if (dir.dirName() == "MacOS") {
        dir.cdUp();
        dir.cdUp();
        dir.cdUp();
    }
#endif
    dir.cd(subdir);
    return dir;
}

QDir MyClass::directoryOf(const QString &subdir)
{
    QDir dir(QApplication::applicationDirPath());

#if defined(Q_OS_WIN)
    if (dir.dirName().toLower() == "debug"
            || dir.dirName().toLower() == "release")
        dir.cdUp();
#elif defined(Q_OS_MAC)
    if (dir.dirName() == "MacOS") {
        dir.cdUp();
        dir.cdUp();
        dir.cdUp();
    }
#endif
    dir.cd(subdir);
    return dir;
}

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This code was taken out of a Qt book, which is available online at http://www.informit.com/articles/art...05554&seqNum=2

The idea is to find the proper path to the containing directory with a switch on platforms. This technique works on Mac OS X but fails on Windows. Note that the relative directory on OS X is ../../../doc/. This led me to believe there has to be an easier way to locate resources and (if so) would potentially alleviate the trouble in displaying the PDF file in Windows. And yes, the test machine on Windows has a PDF viewer associated with .pdf file extensions.

[axeljaeger]

It is not possible because the resource file does not exist on the filesystem outside of your application. The resources are a virtual file system that only exists within your application. You have to copy the file first to some temp location in the real filesystem.