On 9/26/2013 3:57 AM, Etienne Sandré-Chardonnal wrote: > Then I don't see the point of QTemporaryFile... You write some data and > can't do anything with it? > > What are the legacy uses of it?
I use temporary files for memory mapping points and storing undo data. Stuff that can get blown away when the application exits. > - Open the file with a QFile for reading. Such use would be a large > buffer we do not want to keep in memory. But according to what you said, > it must be done before the QTemporaryFile was closed. Then, what > guarantees the writes have been flushed? Don't open a temporary file from another place. It doesn't make sense. > - Write data to a temporary file before renaming it to the final name. > This is useful when a user saves a document overwriting the old version, > in case the system or app crashes he does not loose all the work. But > QFile::rename() closes before renaming, which means according to what > you said the data is not guaranteed to be still there. When you write to that "temporary file", the FILE ITSELF is not temporary - just the name. Don't confuse the two. In that case you're writing a REAL, NON-TEMP file with a temporary name, deleting the old file, then renaming the new file to the proper name. This is NOT the same thing as a "temporary file". _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
