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Re: call_external: passing string from IDL to C
| Re: call_external: passing string from IDL to C [message #31958 is a reply to message #31956] |
Wed, 28 August 2002 13:52  |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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selwyn yee wrote:
> 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
>
Deae Selwyn
I belive you can only pass byte arrays. And if you have more
problems you should have a look at Ronn Klings book about C
and idl.
http://www.kilvarock.com/books/callingCfromIDL.htm
best regards
Reimar
> 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
--
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
http://www.fz-juelich.de/icg/icg-i/
============================================================ ======
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