| Re: dlm question [message #32858 is a reply to message #32851] |
Tue, 12 November 2002 16:47   |
Rick Towler
Messages: 821
Registered: August 1998
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Senior Member |
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I asked this question (in a more obtuse form) a couple of years ago and
received no response. I understand the desire to do this although I would
think that for most applications you could just wrap your dlm routines
within a standard IDL object. This approach certainly isn't as cool as
writing your object as a .dlm but I would guess that your time could be
better spent elsewhere.
But since you piqued my interest again, and your .dlm file gave me an idea,
this is what I have come up with.
First I think we should start with a simple c++ class. Here is the
specification file "test.h":
#include "export.h"
class Test
{
public:
IDL_VPTR IDL_CDECL Init(int argc, IDL_VPTR *argv);
private:
long aprop;
long bprop;
};
Just one public member, Init, and 2 private data members.
Next, we need an implementation file.
#define STRICT
#include <stdio.h>
#include <windows.h>
#include "test.h"
#include "export.h"
#define ARRLEN(arr) (sizeof(arr)/sizeof(arr[0]))
/* Test object Init function*/
IDL_VPTR IDL_CDECL Test::Init(int argc, IDL_VPTR *argv)
{
IDL_ENSURE_SCALAR(argv[0]);
IDL_ENSURE_SCALAR(argv[1]);
aprop = IDL_LongScalar(argv[0]);
bprop = IDL_LongScalar(argv[1]);
return IDL_GettmpLong(1);
}
int IDL_Load(void)
{
static IDL_SYSFUN_DEF2 function_addr[] = {
{(IDL_SYSRTN_GENERIC) Test::Init, "TEST::INIT", 2, 2,
IDL_SYSFUN_DEF_F_METHOD, 0},
};
return IDL_SysRtnAdd(function_addr, TRUE, ARRLEN(function_addr));
}
You will note I have used IDL_SYSFUN_DEF_F_METHOD in the IDL_SYSFUN_DEF2
struct definition. This pretty much has all been a giant guess based on my
limited experience with dlms/c/c++.
But.
I can't compile it. There is a problem with the funct_addr aspect of the
IDL_SYSFUN_DEF2 struct. Well, I don't know exactly where the problem is but
the compiler chokes if the function address is in a class::member form. The
error is:
objectTest.cpp(99) : error C2440: 'type cast' : cannot convert from '' to
'IDL_VARIABLE *(__cdecl *)(void)'
None of the functions with this name in scope match the target type
Any ideas?
-Rick
"Eric Fournier" <eric.fournier@videotron.ca> wrote
> I have a DLM (Dynamically Loadable Modules) question.
>
> I have create a dlm with system routine in the past, but does anyone know
> how to create
> objects and associated methods. I have looked into the idl_dataminer.dlm
and
> it
> declares:
>
> MODULE DATAMINER
> DESCRIPTION IDL DATAMINER support
> VERSION 1.0.1
> SOURCE Research Systems, Inc.
> BUILD_DATE AUG 28 2001
> CHECKSUM 378MWGKG
> FUNCTION DB_EXISTS 0 0
> FUNCTION DIALOG_DBCONNECT 1 1 KEYWORDS
> FUNCTION IDLDBDATABASE::GETDATASOURCES 1 1
> FUNCTION IDLDBDATABASE::GETTABLES 1 1
> FUNCTION IDLDBDATABASE::INIT 1 1
>
> I can see that DB_EXISTS a a standard function, but IDLDBDATABASE is an
> object on wich you can
> call obj_new('IDLDBDATABASE') in IDL. Does anyone know how to code such
> thing in the dll associated in the .dlm file.
>
> I know some mecanism exist, IDL_SYSFUN_DEF_F_METHOD is mentionned in the
> export.h.
>
> Any help would be greatly appreciated
>
>
> Eric Fournier
>
>
>
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