«

Hi All,

We have a set of 32 bit Windows applications developed in Visual C++ which
make use of several third party libraries for various purposes. Now we are
planning to provide our applications in Windows 64 bit platform, and from
the Microsoft site we came to know that we have to recompile our
applications/DLLs using the compilers available for Intel/amd processor
architectures and code changes also will be required. So the question we
have here is that do we need to get 64 bit versions of all dependent third
party libraries for our applications to work in 64 bit windows. Please let
me know any details in this regard.

Thanks in advance,
Sujith Manuel.

While this is primarily an enduser and IT Pro newsgroup (hence the .general
in the name), the short answer is that if you use a library that you don't
have the source for, and it is called "in proc", then you'll need a 64bit
version. The basic rule is that a 64-bit EXE can't call a 32-bit DLL, and
vice-versa. But a 64-bit EXE can call a 32-bit EXE.

--
Charlie.
http://msmvps.com/xperts64


"Sujith Manuel" <> wrote in message
news:eg7hsn$73q$...
> Hi All,
>
> We have a set of 32 bit Windows applications developed in Visual C++ which
> make use of several third party libraries for various purposes. Now we are
> planning to provide our applications in Windows 64 bit platform, and from
> the Microsoft site we came to know that we have to recompile our
> applications/DLLs using the compilers available for Intel/amd processor
> architectures and code changes also will be required. So the question we
> have here is that do we need to get 64 bit versions of all dependent third
> party libraries for our applications to work in 64 bit windows. Please let
> me know any details in this regard.
>
> Thanks in advance,
> Sujith Manuel.
>
>