Hi Peter, I have recently tried the "Callable IDL" technique from a Windows Console application developed using Visual C++ and was able to pass scalar and array values between C++ and IDL without any trouble. I haven't as yet looked at using it from a DLL, so perhaps I can't help you directly. I basically started by reproducing the example program that is supplied with IDL, then moved on from there to something more complex. I maybe wrong, but I think the documentation makes some comments regarding the use of threads and IDL in this way so it may be worth reviewing the help files if you've not already done so. I could just be clutching at straws as you don't mention what the error was - does this not give an indication of the problem? Cheers Si

Hi all, I wanted to use the callable IDL application and I have Microsoft Visual Studio 2005 (VC++  8.0). But, I am not able to compile the calltest.c code that is given in the IDL examples. When I open in the VC++ IDE, there is no option of Build or Debug in that. Can someone please give me a headstart on this as to where I am going wrong and what basics should  I strengthen before venturing in here? Any help will be sincerely appreciated. Thanks Rohit