Qt based app 'Qt platform plugin windows not found' issue when opening a file

Question

Probably most of the people that has experience with Qt5 libraries will say that I should copy qwindows.dll to myappfolder/platforms/qwindows.dll.

That was already made and working flawlessly.

The problem is that I've registered the extension of my files with that app and when I double click to open a file the app crashes since it cannot find that qwindows.dll.

Desesperatly also I tried without luck this code:

QApplication::addLibraryPath(QCoreApplication::applicationDirPath());
QDir::setCurrent(QCoreApplication::applicationDirPath());
QApplication::addLibraryPath("./");
QString sDir = QCoreApplication::applicationDirPath();
QApplication::addLibraryPath(sDir);
QApplication::addLibraryPath(sDir+"/plugins/");
QApplication::addLibraryPath(sDir+"/platforms/");

But I had no luck neither.

Any tip?

As I wrote in the comments this is not the same a the deploy issue since the .exe opens fine if it gets open directly.

Possible duplicate of How to deploy a Qt application on Windows? — MrEricSir
– MrEricSir, Commented Nov 24, 2015 at 19:24
No, as I said I can deploy it without problems I mean it opens fine if I try to open the .exe directly, the problem only happens if I associate an extension and open that file, so it could be something similar to open it using a command line. — Frank Escobar
– Frank Escobar, Commented Nov 24, 2015 at 19:26
Try to discriminate between a wrong searchpath or a plugin problem. If only qwindows.dll is a problem you might need to add a qt.conf file — adlag
– adlag, Commented Dec 3, 2015 at 10:58

DannyK · Accepted Answer · 2015-11-27 17:20:19Z

0

So I am guessing that by running it like this actually sets the application default directory where the shortcut is. You could test it by putting your shortcut/whatever file in the same directory as your .exe and see if that works.

There are ways to tell Qt loader to look elsewhere but I have never actually played with it. Look here:http://www.tripleboot.org/?p=536 And search for QT_QPA_PLATFORM_PLUGIN_PATH I think it's on about setting a system variable to your .exe location set QT_QPA_PLATFORM_PLUGIN_PATH=c:\myapp

Good luck

answered Nov 27, 2015 at 17:20

DannyK

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