[RESOLVED] FileIO.FileSystem.CopyFile not copying entire file???

[i00]

I am using FileIO.FileSystem.CopyFile to copy a file that is ~50 MB ... my issue is that it copys the file without erroring ... but the output filesize is only the first 1.39 MB of the file??? ... has anyone come across this before? ... should I just use other methods to copy the file?

FileIO.FileSystem.CopyFile(FileIn, FileOut, True)

Thanks,
Kris

[jmcilhinney]

Not that it should make a difference, but that method is intended to be called as My.Computer.FileSystem.CopyFile.

Have you tried IO.File.Copy on the same file to see if that works? Have you tried that same CopyFile method on other files in the same and different locations to see if it works on them? Just trying to get a feel for whether this is an isolated issue because I can't think of any reasonable explanation for the behaviour you're seeing.

[jmcilhinney]

should I just use other methods to copy the file?

Personally, I tend to use System.IO but there's nothing wrong with using My.Comuter.FileSystem. I would just recommend consistency in whatever option you choose, e.g. if you use File.Copy then use Path.Combine and if you use My.Computer.FileSystem.CopyFile then use My.Computer.FileSystem.CombinePath. I tend to use My only when it provides functionality not provided elsewhere, e.g. the overloads of CopyFile that provide their own progress dialogue.

[i00]

Thanks, I will try those suggestions later, and there is a reason that I specifically use this method rather than other methods to copy a file...

it is so that it presents this if the file is in use:


Also it seems to work for ALL other files that I have ever copied using this method ... just this one file that causes issues

Kris

[jmcilhinney]

Thanks, I will try those suggestions later, and there is a reason that I specifically use this method rather than other methods to copy a file...

it is so that it presents this if the file is in use:


Also it seems to work for ALL other files that I have ever copied using this method ... just this one file that causes issues

Kris

Makes sense. I believe that FileSystem uses the same shell functions that Windows/File Explorer uses so you get the same dialogues.

I can't think of anything that would cause that behaviour, unless there's something about the inner workings of that method that I'm unaware of. What happens if you try to copy that file in Windows/File Explorer? What happens if you use File.Copy?

[TnTinMN]

I am using FileIO.FileSystem.CopyFile to copy a file that is ~50 MB ... my issue is that it copys the file without erroring ... but the output filesize is only the first 1.39 MB of the file??? ... has anyone come across this before? ... should I just use other methods to copy the file?

FileIO.FileSystem.CopyFile(FileIn, FileOut, True)

Is your source file on a NTFS partition and the destination on a non-NTFS partition?

The reason that I ask this is because the only scenario that I can think of that would produce your results is a NTFS source file where the bulk of the data is in alternate data streams and you are copying the file to a non-NTFS destination (FAT formatted thumb drive?). The alternate data streams would not be able to be copied in that case. I just tested this case and no errors are generated. Doing it through File Explorer produces a warning about copying a file without its properties.

[i00]

Nope ... source and dest were on the same HDD ... NTFS... seemed to do it with that file only, but explorer could copy the file with no probs ... just changed the method used to copy ... and prob solved ... doesn't really matter about loosing the windows dialogs ... just replaced them with mine.

Kris