need 64 bit Windows dll and executable ?

[fechen]

I need to port a C based program to Windows 64 bit. The calling sequence is like this:

Exceutable (A) ---> dll (B) --> dll from Vendor (C) --> hardware

I have everything in 32 bit, works very well on NT, 2000, XP (32bit). When I put it on Windows 2003 (64 bit), it doesn't work.

Questions are:
Do I need to compile (A) and (B) in 64 bits? I can get a 64 bit (C) from vendor. Does Windows 2003 (64bit) suppose to run 32 bit seemlessly?

If I need a 64 bit version of (A) and (B), can you guys suggest a 64-bit compiler? Is there a 64 bit Visual C++? Or maybe a free one will be best.

Too many question . I just occasionly use Visual C++. C++ experts, please help. Thanks.

 

[asimasm]

hi fechen
have u found a solution to this problem yet?

 

[fechen]

Yes. I made 32 bit application working on 64 bit, by modifying registry a bit - my application reads the registry to get part of information.

C++ 64 bit compiler, I tried Microsoft Platform SDK. worked well. I ends up not using 64 bit application, since vendors are not ready for 64 bit DLL at this time.