QFile::rename problem

SurplusCJ

Hi, all
in my project, i wish to rename a file before exit the application.
here is my problem, i called QFile::rename function to rename the file, the function return true, and i use QFile::exist to check the destination file exist or not, it return true (means the file already exist). but i open the saved path to check the files, it does not exist in th e destination folder.

Attention: after QFile::rename function returned, i do exit the application (i call the rename function in the main thread, so rename function returned, the application finished)

here is my rename function:

bool Utils::renameFile(QString oldName, QString newName)
{
    if (oldName.isEmpty() == true
            || newName.isEmpty() == true) {
        return false;
    }
    return QFile::rename(oldName, newName);
}

bool b = Utils::renameFile(mLogFileName, mSavedFileName);

    QThread::msleep(50);

    QFile file(mSavedFileName);
    int count = 0;
    LOG_D(tlfTAG, "Save file -> file exist : " + QString::number(file.exists()));
    while (file.exists() == false && count < 10) {
        LOG_D(tlfTAG, "Save file -> save file checking...");
        QThread::msleep(20);
        count ++;
    }

    if (file.exists() == false) {
        LOG_E(tlfTAG, "Save file -> save failed (file not exist in the folder) : timeout");
        return false;
    }

The ```
LOG_D(tlfTAG, "Save file -> file exist : " + QString::number(file.exists()));

and the while loop should never enter.

And if do the rename flow while the application is running (without exit application), the rename flow should be succeed.

JonB

@SurplusCJ
Your explanation not clear: are you saying "while the app executing the QFile::rename() is still running I do not see/cannot open the renamed file in its new name/location, but after the app exits I do see/can open it there"?

jsulm

@SurplusCJ Did you check manually whether the file is there?

SurplusCJ

@jsulm yes, i do check the file manually in the destination folder.
and found the expected files not exist.

jsulm

@SurplusCJ Are you sure your app is storing the file where you expect it to store it?
I mean, how did you construct the file path (mSavedFileName)?
Does mSavedFileName contain a complete/absolute path, or only file name, or only a relative path?
If it is only file name or relative path then it will be stored relative to the current directory of the process.

JonB

@SurplusCJ said in QFile::rename problem:

@jsulm yes, i do check the file manually in the destination folder.
and found the expected files not exist.

Like I asked above, are you saying that is different while the program is still running versus after the program has exited, or does the file never exist?

SurplusCJ

I found the root cause.
while exit the application, removed the source file in the de-constructor.

Thanks all of you.