QFile::remove works wrong or where is problem?

DrageFabeldyr

OS - Android
I have database file which i can change on PC then copy to my phone.
Program checks if there is a new one, copy it and then delete.

        bool copySuccess = QFile::copy(new_name, name);
        if (!copySuccess)
        {
            QMessageBox::critical(0, QString("Error!"), "Database wasn't updated", QMessageBox::Ok);
        }
        else
        {
            QMessageBox::critical(0, QString("Yeah!"), "Database was updated", QMessageBox::Ok);
            QFile::remove(new_name);
        }

if i run program again it says there isn't new database file but if i open it's location in file browser i can see it

why is it so?

J.Hilk

hi @DrageFabeldyr ,
you can't overwrite existing files with QFile::copy

taken from the docu:

bool QFile::copy(const QString &fileName, const QString &newName)
This is an overloaded function.

Copies the file fileName to newName. Returns true if successful; otherwise returns false.

If a file with the name newName already exists, copy() returns false (i.e., QFile will not overwrite it).

See also rename().

DrageFabeldyr

@J.Hilk great thanks about copy, now i know what is wrong with it but my question was about remove

if i remove file program can't see it after that but file browser can

J.Hilk

@DrageFabeldyr
mmh, interesting,

Do you check if the Remove is successful? QFile::remove should return a bool. It won't work for example if the file can't be closed.

DrageFabeldyr

@J-Hilk
QFile::remove returns true
then program says there is no file
file browser shows there is a file
if i try to copy this file from the phone to pc there is no this file on pc after that so it looks like i'm trying to copy nothing
if i try to copy file from pc to the phone to the same place it asks me if i want to overwrite the file so it looks like "nothing" really exist

mvuori

If Qt's functions don't see the file, it doesn't exist. Your file browser "sees" it, but it may be caching the directory - try refreshing it and try to open it into a text editor or something.

DrageFabeldyr

@mvuori
i've tried restart my phone, reconnect it to my pc and even connect it to another pc

and i mean file browser on pc (Windows 7)
file browser on the phone doesn't see the file (Android)