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call_external: passing string from IDL to C [message #31967]

Wed, 28 August 2002 01:41

selwyn_yee
Messages: 1
Registered: August 2002

Junior Member

Hi,

I am trying to pass an IDL string to C using call_external. My setup
is:

IDL 5.5
Visual C++ 6.0
Windows 2000 Workstation
P4 2Ghz, 512 mb

I can't even get IDL's example to pass a string from IDL to C. I
built the DLL from \RSI\IDL55\external\C\string_array.c. Then I debug
the DLL from Visual Studio, and run string_array.pro. In debug, C
receives and IDL_STRING structure with the proper length of the string
(not counting NULL char). But you cannot see the string itself. You
see

"CXX0030: Error: expression cannot be evaluated"

Has anyone gotten the example routines to work?

Thanks,
Selwyn Yee

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