QFile, QIODevice bug during appending text?

[amleto]

"No. The one and only thing I use one QThread is..."
euhm, that should be a 'yes (but it's disabled at the moment)'

Just because you do things with signal/slot doesn't mean that you are protected against threading issues when writing to text file.

From the symptoms, it feels like there must be multiple things opening the file. You also say 'sometimes whole line missing...' which implies you can't consistently repeat the issue. This also hints at multi threaded cause.

[jackmack]

"No. The one and only thing I use one QThread is..."
euhm, that should be a 'yes (but it's disabled at the moment)'

Just because you do things with signal/slot doesn't mean that you are protected against threading issues when writing to text file.

From the symptoms, it feels like there must be multiple things opening the file. You also say 'sometimes whole line missing...' which implies you can't consistently repeat the issue. This also hints at multi threaded cause.

Yes, that's the same I think. But I'm very careful with using thread and I use only if I have no chance to avoid it.

It seems I have fixed it! Using the member "QFile m_file" causes issues. But when I use only inside the write() method a locally generated QFile instance (on stack!) then it works! But I will test it more exactly.