QFile.open fails to open a file inside resource qrc

Question

I have encountered a strange issue where QFile.open is unable to open a file which is added in the qrc resource file. My qrc file looks like this

I'm using following code to read the file theme_normal.qss

QFile file(":/styles/theme_normal.qss");

if (file.open(QIODevice::ReadOnly | QIODevice::Text))
{
    QString style(file.readAll());
    file.close();
}
else
{
    QMessageBox::critical(nullptr, "Error", "Error loading style file: " +  file.errorString());
}

I'm getting following error: No such file or directory

Same code (as it is) works fine in Qt 5.7.0. I'm facing above issue with Qt 5.9.2. What could be the reason?

My example project: https://github.com/warunanc/QtFileFromResources

Do you intend the "/styles" folder name instead of just "styles"? — hyun, Oct 30 '17 at 14:40
Did you try the alternative syntax (not that it should matter)... qrc:///styles/theme_normal.qss — Rolf Winter, Oct 30 '17 at 14:46
I am using exactly the same approach for loading stylesheets from resource files. I've also moved to Qt 5.9.2 and my files are loaded correctly. So, may I ask you to put the example on GitHub. I will try to compile it as well. — scopchanov, Oct 30 '17 at 15:14
@CodeDreamer yes I intentionally used that. Working fine in Qt 5.7.0 — warunanc, Oct 30 '17 at 18:24
I don't get the error either. Completely unrelated, but anyway: Why do you need to include the qss to the DISTFILES? — scopchanov, Oct 30 '17 at 21:27
It will compile it anyway as you include it in the resources. — scopchanov, Oct 31 '17 at 13:29
@scopchanov now only I understood your question. I added it for testing purpose, because nothing was working. Yes, including it in qrc file only should be enough — warunanc, Nov 01 '17 at 08:04
:) I see. Back to the issue. Did you manage to make it work? — scopchanov, Nov 01 '17 at 09:00
@scopchanov nope. I gave up. Went back to 5.7.0. Maybe a fresh installation would work. — warunanc, Nov 01 '17 at 09:12

score 0 · Answer 1 · answered Nov 03 '17 at 14:32

0

In my similar case the problem was solved after removing all Qt DLL files from appication dir (system: Windows 10) and copy new DLL files.

I found that in 5.9 there is no more Qt5CLucened.dll for example. Possible problem was in obsolete Qt5CLucened.dll file

answered Nov 03 '17 at 14:32

Totktonado

5
3

this could well be the reason. I'll try this – warunanc Nov 05 '17 at 15:50

Shun · Answer 2 · 2019-03-30T09:22:39.733

In case anyone have similar case.

My environment : ubuntu 16.04 LTS, Qt 5.9.4.

I have tried:

reboot system.
restart Qt creator
clean project, build qmake and rebuild project
changed qrc prefix
remove qrc's target file and add it again

There are no help.

Finally, I remove the qrc and add a new qrc with same name and same file, and remove old qrc_xxx.cpp and qrc_xxx.o in build folder, it also doesn't help.

But, I remove the qrc and add a new qrc with different name, such that, old qrc named res.qrc and new qrc named res1.qrc, then build qmake and build project, it works fine!!!

I don't know why, maybe some old caches? It takes me long times..):

EDIT: I found the reason is that if you use SUBDIRS in .pro and have two project have same name qrc, you will get this trouble.

QFile.open fails to open a file inside resource qrc

2 Answers2