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Re: URGENT: IDL_STRING variable in calling C from IDL when update from IDL5.4 to 5.6 [message #37116 is a reply to message #37019]

Fri, 21 November 2003 02:13

Nigel Wade
Messages: 286
Registered: March 1998

Senior Member

Xiaoying Jin wrote:
> Hi, there,
>
> I am building program that calls C from IDL by DLM. In IDL, the
> function passed only one parameter that is a string, such as
> 'test.txt'. In C, use argv[0]->value.str.s to read the string out.
> In IDL 5.4, the program works well.
>
> I updated IDL from 5.4 to 5.6, the program is dead. I debug the
> program and found that when I use IDL5.4 to debug, the
> argv[0]->value.str.s has the right input: 'test.txt'. However, when I
> use IDL5.6 to debug, the argv[0]->value.str.s is NULL.
>
> How can this happen? Is this a bug in IDL5.6 or RSI changed something
> about the IDL_string strucure? I test the program in IDL6.0, the same
> error happened.
>
> Any help will be appreciated,
>
> Jin

Yes, they changed the length field slen from short to IDL_STRING_SLEN_T
(which is currently int) so the structure changed. I think it's documented
in the release notes.

You need to recompile your C code using the header files from IDL 5.6.

--
Nigel Wade, System Administrator, Space Plasma Physics Group,
University of Leicester, Leicester, LE1 7RH, UK
E-mail : nmw@ion.le.ac.uk
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555

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[Message index]

		URGENT: IDL_STRING variable in calling C from IDL when update from IDL5.4 to 5.6 By: xje4e on Thu, 20 November 2003 23:07
		Re: URGENT: IDL_STRING variable in calling C from IDL when update from IDL5.4 to 5.6 By: David Fanning on Mon, 24 November 2003 12:42
		Re: URGENT: IDL_STRING variable in calling C from IDL when update from IDL5.4 to 5.6 By: xje4e on Mon, 24 November 2003 12:36
		Re: URGENT: IDL_STRING variable in calling C from IDL when update from IDL5.4 to 5.6 By: Nigel Wade on Fri, 21 November 2003 02:13

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