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Re: call_external (IDL5.5) [message #29483 is a reply to message #29475]

Mon, 25 February 2002 20:03

Mark Rivers
Messages: 49
Registered: February 2000

Member

James Kuyper <kuyper@gscmail.gsfc.nasa.gov> wrote in message
news:3C7A5831.8030306@gscmail.gsfc.nasa.gov...
> Mark Rivers wrote:
> ...
>
>> There is one very important difference between CALL_EXTERNAL in IDL 5.5
and
>> previous versions, which has to do with how IDL strings are passed. The
>> following code is from "export.h" in IDL 5.5.
>> ********************************************
>> typedef int IDL_STRING_SLEN_T;
>> #define IDL_STRING_MAX_SLEN 2147483647
>>
>>
>> typedef struct { /* Define string descriptor */
>> IDL_STRING_SLEN_T slen; /* Length of string, 0 for null */
>> short stype; /* type of string, static or dynamic */
>> char *s; /* Addr of string */
>> } IDL_STRING;
>
> Which points out he importance of using "#include export.h" to create
> the typedef, rather than copying the typedef into your own code.

This would not solve the problem that the original poster had, which is that
DLLs that work with IDL 5.4 no longer work with IDL 5.5. I want to
distribute a single DLL that will work with "all" IDL versions, and there is
no longer any way to do that if strings are passed to CALL_EXTERNAL. By
using byte arrays one can work around this problem.

Mark Rivers

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[Message index]

		Re: call_external (IDL5.5) By: Craig Markwardt on Tue, 26 February 2002 10:43
		Re: call_external (IDL5.5) By: R.Bauer on Tue, 26 February 2002 08:58
		Re: call_external (IDL5.5) By: Mark Rivers on Mon, 25 February 2002 20:03
		Re: call_external (IDL5.5) By: James Kuyper on Mon, 25 February 2002 07:28
		Re: call_external (IDL5.5) By: Mark Rivers on Mon, 25 February 2002 06:56
		Re: call_external (IDL5.5) By: notspecified on Mon, 25 February 2002 05:56
		Re: call_external (IDL5.5) By: Gert Van de Wouwer on Mon, 25 February 2002 05:35
		Re: call_external (IDL5.5) By: R.Bauer on Mon, 25 February 2002 05:19
		Re: call_external (IDL5.5) By: Gert Van de Wouwer on Wed, 06 March 2002 06:42

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