SetFileTime on an image, File::open set filesize to 0

[ClementD]

Hello, i have a problem using QFile::setFileTime, when i try to open a ".jpg" file, the file's size is automatically set to 0. However, i have to open the file to setFileTime...

bool copyFileKeepingMetadatas(const QString& origin, const QString& destination) {
    QFileInfo fileInfo(origin);
    QDateTime birthTime = fileInfo.fileTime(QFile::FileBirthTime);
    QDateTime modifTime = fileInfo.fileTime(QFile::FileModificationTime);
    QDateTime accessTime = fileInfo.fileTime(QFile::FileAccessTime);

    if (QFile::exists((destination)))
    {
        QFile::remove(destination);
    }

    bool worked = QFile::copy(origin, destination);

    if (worked) {        
        // Destination is an .jpg file
        QFile d(destination);
        if(d.open(QFile::WriteOnly)) { // Set file size to 0 event if i comment setFileTime below
           // setFileTime return false if file is not opened 
            //d.setFileTime(accessTime, QFile::FileAccessTime);
            // d.setFileTime(modifTime, QFile::FileModificationTime);
            // d.setFileTime(birthTime, QFile::FileAccessTime);
            d.close();
            return true;
        } else {
            return  false;
        }
    } else {
        return false;
    }
}

Is then an other way to modify image métadatas?

[Christian Ehrlicher]

@ClementD said in SetFileTime on an image, File::open set filesize to 0:

when i try to open a ".jpg" file, the file's size is automatically set to 0.

What do you expect? See https://doc.qt.io/qt-5/qiodevice.html#OpenModeFlag-enum

[ClementD]

Hello @Christian-Ehrlicher , I want to copy a file keeping file times from the original. When i open the file, i do not want to modify it's content (only date)

i also try to open it using QFile::WriteOnly | QFile::ExistingOnly flags or QFile::WriteOnly | QFile::Unbuffered, same issue

[ClementD]

Problem solved using if(d.open(QFile::WriteOnly | QFile::Append)) to open th file