The process cannot access the file because it is being used by another process

[davidsj2]

I'm attempting to use BC3 with Mercurial. Here are the relevant sections from my Mercurial.ini:

[extensions]
extdiff =

[extdiff]
cmd.bcomp = C:\Program Files (x86)\Beyond Compare 3\BCompare.exe
opts.bcomp = /leftreadonly

This works great, unless I already have BC3 running. Even if it's just the "home screen", attempting to use BC3 via mercurial results in the following error:

c:\Users\davidsj2\repos\ast\OCE\targets\ast>hg bcomp
abort: The process cannot access the file because it is being used by another process: c:\users\davidsj2\appdata\local\temp\extdiff.7u1pyp

Following the error, BC3 will pop up in the same instance as the previously opened session, but the version of the source file on the left side (remote version) displays "File Not Found" with a red X and is empty.

[Chris]

As described in our Mercurial instructions (http://www.scootersoftware.com/suppo..._vcs#mercurial), use "bcomp.exe", not "bcompare.exe".

Bcomp.exe opens a separate helper process for each diff. Bcompare.exe opens everything in a single process, which prevents Mercurial from correctly detecting when a diff is closed if you do diffs.

[Radrik]

BComp.exe doesn't work with Folder Compare sessions ("hg bcomp" with several modified files) and always produces "The process cannot access the file" error message.

[Chris]

Beyond Compare supports file diffs from version control, but not folder diffs from version control.

Folder diffs from version control our on our wish list for a future version of Beyond Compare.