[omniORB] Need help creating C interface to omniORB application on a Windows machine

[W T Meyer]

I am using omniORB to salvage some legacy software developed on a 
Windows machine using a National Instruments VME hardware interface 
and LabWindows GUI to access VME hardware.  The application is 
written in C and must be compiled with NI's CVI compiler to get the 
GUI interface. We have replaced the old NI hardware interface with a 
single board computer running Linux and want to keep using the old 
client software.

I have developed a DLL that replaces the client's calls to NI 
routines (in C) with work-alike routines using omniORB.  I must 
compile the omniORB code with MSVC++ (version 6.0) and export it 
using 'extern "C"' in order for the CVI compiler to link to it.

I had all of this working until I added the ability to transfer 
arrays, which required adding _var variables. After that, the old 
method of compiling on MSVC++ still gave a DLL and gave no error 
messages, but neither CVI nor MSVC++ client programs were able to use 
it - the DLL was somehow corrupted.

Following the advice in chapter 12 of the omniORB manual, I tried 
adding '#define USE_stub_in_nt_dll' before including my stub headers 
and this did not fix the problem.

Does anyone have any experience doing this, or any thoughts that 
could be helpful?

Thanks,

Tom Meyer