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Resume Copy for broken files like HTTP/FTP resuming
Posted: 2010-05-19, 15:52 UTC
by Matthias030
For HTTP/FTP downloads it is possible to resume download of partial files after connection was interrupted.
Sometimes I use a network share over an internet vpn connection. If I copy a file and the connection is lost, it is not possible to resume the copy of the partial copied files.
Can you make an option to do this? At this time only "append" is possible, but this is not what I want.
Posted: 2010-05-19, 20:53 UTC
by ghisler(Author)
Unfortunately it's not possible. Why? To avoid fragmentation, TC sets the total size of the target file before starting the transfer. Therefore it's not possible to see how far the copying went when there is a complete connection loss.
Posted: 2017-08-02, 06:52 UTC
by aakka
ghisler(Author) wrote:Unfortunately it's not possible. Why? To avoid fragmentation, TC sets the total size of the target file before starting the transfer. Therefore it's not possible to see how far the copying went when there is a complete connection loss.
sample of resume
Hello there,
Are you sure that it's not possible?
Thanks
Re: Resume Copy for broken files like HTTP/FTP resuming
Posted: 2017-08-06, 11:11 UTC
by aakka
Matthias030 wrote:For HTTP/FTP downloads it is possible to resume download of partial files after connection was interrupted.
Sometimes I use a network share over an internet vpn connection. If I copy a file and the connection is lost, it is not possible to resume the copy of the partial copied files.
Can you make an option to do this? At this time only "append" is possible, but this is not what I want.
Sorry
Posted: 2017-08-07, 13:46 UTC
by ghisler(Author)
This could be possible when using CopyFileEx with special parameter COPY_FILE_RESTARTABLE. However, as Microsoft write:
"This can significantly slow down the copy operation as the new file may be flushed multiple times during the copy operation."
Furthermore, there are no functions to check whether a file is a partial file or not. CopyFileEx allocates the entire space needed at the start, so a partial file has the same size as the complete file.
Posted: 2017-11-04, 19:51 UTC
by jcelle
Hi Christian, this is also an option I would like very much.
What I don't get is that when a copy fails, I can clearly see that the destination file does not have the full size of the original as it should have if this pre-allocation was taking place.
It really looks like fseeking( sizeof(destination) ) could help start copying from a predefined point of the source file.
Am I missing something ?
Cheers.
Posted: 2017-11-05, 10:15 UTC
by ghisler(Author)
What I don't get is that when a copy fails, I can clearly see that the destination file does not have the full size of the original as it should have if this pre-allocation was taking place.
Not confirmed. How does the copying break? Where is the source located, and where the target file?