| Need help passing string data using CALL_EXTERNAL. [message #37639] |
Tue, 13 January 2004 17:05  |
Jacob.Spinsby
Messages: 1
Registered: January 2004
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Junior Member |
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I am attempting to pass 2 filenames (strings), 3 integers, and a
double entered in the parameters section of CALL_EXTERNAL to a DLL I
have created. I have no problems passing the integers and the double
using the portable calling convention, but I am having significant
difficulty figuring out how to pass strings. I have only recently
begun to learn IDL, so I am not that familiar with it. Any help would
be greatly appreciated. Thanks
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| Re: Need help passing string data using CALL_EXTERNAL. [message #37776 is a reply to message #37639] |
Wed, 28 January 2004 01:40  |
ebertf
Messages: 12
Registered: January 2004
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Junior Member |
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Jacob.Spinsby@asu.edu (JSpin) wrote in message news:<f4a782c4.0401131705.3876b019@posting.google.com>...
> I am attempting to pass 2 filenames (strings), 3 integers, and a
> double entered in the parameters section of CALL_EXTERNAL to a DLL I
> have created. I have no problems passing the integers and the double
> using the portable calling convention, but I am having significant
> difficulty figuring out how to pass strings. I have only recently
> begun to learn IDL, so I am not that familiar with it. Any help would
> be greatly appreciated. Thanks
Hi,
I had the same problem, but it worked out fine when I use this code:
DLL WRAPPERFUNCTION for the function dllquest of MYDLL.DLL for the
function COMPILED IN C:
The string is passed by reference:
#include "stdio.h"
#include "idl_export.h"
<Headers required for MYDLL>
_declspec(dllexport) IDL_INT IDL_CDECL wrappdllquest(int argc, void
*argv[])
{
return (dllquest(((char *) argv[0]);
}
compiling the wrapper DLL looked like this:
cl -DLL -DWIN32 -D_MT /nologo /I"C:\RSI\IDL60\external\include"
/I"D:\idl\flopro\motoren\<path to MYDLL>" /c mydllglue.c
/Fomydllglue.obj
linking the wrapper DLL looked like this:
link /out:mydllglue.dll /nologo /nodefaultlib /dll piglue.obj
"C:\RSI\IDL60\bin\bin.x86\idl32.lib" MYDLL.lib msvcrt.lib kernel32.lib
The IDL CALL_EXTERNAL should look like this:
result=call_external(<gluepath>,'wrappdllquest','your string to
pass',/i_value,/cdecl,value=[0])
Florian
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