QDesktopServices::openUrl(QUrl::fromLocalFile()) strange behavior

hbatalha

I have a function that is supposed to open a local media file.

in that I only have one line of code (below):

QDesktopServices::openUrl(QUrl::fromLocalFile("D:\\Desktop\\Test1\\ACID Explained - Atomic, Consistent, Isolated & Durable.mkv"));

When I call that function through a pushButton click for the first time after I open the app it works fine but from the second time on it stops working. I call it many times after the first time but only works randomly.

I am on Windows in MingW environment and I experienced this behavior with Qt 5.15.2, 6.1.2, 6.1.3 and 6.2.0.

Has anyone experienced something similar?

SGaist

Hi,

Which application opens that file ?
Do you stop it between two calls ?

mchinand

In addition to @SGaist 's questions, what is the behavior when you double-click on the file in Windows File Explorer and then when you double-click on the file subsequent times?

JonB

@hbatalha said in QDesktopServices::openUrl(QUrl::fromLocalFile()) strange behavior:

I call it many times after the first time but only works randomly.

Sounds like Windows application behaviour on the app associated with .mkv, not to do with Qt. Is it possible that does nothing if that file/URL is already open? Check running processes to see if that app might already be running on that file?

hbatalha

@SGaist said in QDesktopServices::openUrl(QUrl::fromLocalFile()) strange behavior:

Which application opens that file ?

Qt Widgets Application

Do you stop it between two calls ?

No

hbatalha

@mchinand said in QDesktopServices::openUrl(QUrl::fromLocalFile()) strange behavior:

In addition to @SGaist 's questions, what is the behavior when you double-click on the file in Windows File Explorer and then when you double-click on the file subsequent times?

It opens files normally as expected

mchinand

@hbatalha said in QDesktopServices::openUrl(QUrl::fromLocalFile()) strange behavior:

It opens files normally as expected

What is the behavior when you click on the same file a second time when the application is still running from clicking on the file the first time?

hbatalha

@JonB said in QDesktopServices::openUrl(QUrl::fromLocalFile()) strange behavior:

Sounds like Windows application behaviour on the app associated with .mkv, not to do with Qt.

It looks like you are right, I just switched the default app for .mkv from VLC to Windows Movies & TV and it is opening file every time I call the function.

Check running processes to see if that app might already be running on that file?

No, no process is running on the file.

hbatalha

@mchinand said in QDesktopServices::openUrl(QUrl::fromLocalFile()) strange behavior:

@hbatalha said in QDesktopServices::openUrl(QUrl::fromLocalFile()) strange behavior:

It opens files normally as expected

What is the behavior when you click on the same file a second time when the application is still running from clicking on the file the first time?

It restarts the media.

SGaist

@hbatalha said in QDesktopServices::openUrl(QUrl::fromLocalFile()) strange behavior:

Qt Widgets Application

Is it your own application ?
If so, I would say that it does not handle opening the file properly ?

hbatalha

Update: I really think @JonB is right, it's was a Windows behavior rather than Qt's. After switching back to VLC as the default app for .mkv, calling the function opens file every time.