Re: Distributing msvcrt.dll

From:

"Ben Voigt [C++ MVP]" <rbv@nospam.nospam>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 21 Apr 2008 10:45:36 -0500

Message-ID:

<u6LxrZ8oIHA.3860@TK2MSFTNGP02.phx.gbl>

p8mode wrote:

On Apr 17, 5:00 pm, "Ben Voigt [C++ MVP]" <r...@nospam.nospam> wrote:

On Windows Xp/Vista my app crashes unexpectedly if I put the
msvcrt.dll into the same folder as my app's exe. Everything seems
fine if I dont (so that my app instead uses the version from
windows' system32 dir). Are such crashes to be expected, if is
using the msvcrt.dll from win 2000 machine? And are newer versions
always better, or are the versions which ship from microsoft with
each os the most appropriate (in whihc case what to do with win 95)?

Many system DLLs use functions from msvcrt.dll. If you loaded an old
version of msvcrt.dll, then the system version can't be loaded (name
collision) and the system DLLs will fail.

Thanks very much in Advance.

So I shouldn't copy (an old, win2000) version of msvcrt.dll into my
app's folder, since when my app starts (and loads this version), the
other apps wont be able to load the newer version they need, even
though theyre trying to load the one in the system32 folder?

It's not "other apps", this doesn't affect them at all. It's the system
libraries your own application relies on that will fail to work if an old
version of msvcrt.dll is loaded into your process, as Windows only allows
one copy of a library with a particular name to be loaded at once.