how to when use a file can't delete the file

[ARASHz4]

Hi
When i load a file to my app should can't delete or rename the file, when my app using the file.
how to do this?

[VRonin]

Check QLockFile

[ARASHz4]

@VRonin how to use correctly?
this my code :

QLockFile lf("J:/file.txt");
lf.lock();

whit this code file deleted & app crash(exit code 1073741845) & anti virus alert me my app is virus!

[VRonin]

please read the description of the class

For the use case of protecting a resource over a long time, you should therefore call setStaleLockTime(0), and when tryLock() returns LockFailedError, inform the user that the document is locked, possibly using getLockInfo() for more details.

[ARASHz4]

@VRonin thank you but can you show me a example