Populate QDataStream and only write to QIODevice under a certain condition

[JPNaude]

Hi

What would the best way be to do this:

I have a QDataStream which saves project data to a file. Currently I do it like this:

QFile file(file_name);
    file.open(QIODevice::WriteOnly);
    QDataStream stream(&file);   // we will serialize the data into the file
    // Now I stream lots of stuff to the stream.

QFile file(file_name);
    file.open(QIODevice::WriteOnly);
    QDataStream stream(&file);   // we will serialize the data into the file
    // Now I stream lots of stuff to the stream.

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However sometimes something goes wrong in the project saving and in that case I still need the original file. One way I can think of doing it is to write out a temp file and when successfull copy it over the current file. But I'm sure there must be a better way.

Can I create the stream and then flush it to the file all at once when everything went alright? Or what is the recommended way to do this.

Thanks,
Jaco