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)