Question

Passing structure in COM

Asked by: yonit

Hi,
Can I transfer my defined structure or a pointer to my structure as a COM paramter. I think that the user can recognize it from idl.
Thanks !

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Asked On
2002-06-02 at 08:41:03ID20306997
Topic

C++ Programming Language

Participating Experts
2
Points
50
Comments
7

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Answers

 

by: Chase707Posted on 2002-06-02 at 09:23:57ID: 7049597

yes,

in the idl file:

typedef struct MY_STRUCT
{
    int mystuff;
} MY_STRUCT;
...
interface IMyInterface : IUknown
{
   HRESULT myMethod( [in] MY_STRUCT* pStruct);
}
...

then just implement it in your component as normal.

Chase707

 

by: vcppmfcPosted on 2002-06-02 at 21:39:49ID: 7050350

Hi Chase707

Its right , but then i think you cann't access this structure in scripting language like VB.OR this structure should be marshaled proferly.

 

by: yonitPosted on 2002-06-02 at 22:51:13ID: 7050387

What can be done for VB?

 

by: Chase707Posted on 2002-06-02 at 22:57:17ID: 7050394

In VB you can just define the structure using VB conventions before you call the method.  I do not know the VB language well, so I do not recall the exact syntax.

I think it's something like:
...
Type MY_STRUCT
   stuff as int
End Type
...

As long as your struct contains only Automation compatible types  (those defined in the VARIANT enum), then IDL will handle the details of marshalling your structures across processes.

 

by: yonitPosted on 2002-06-02 at 23:03:31ID: 7050408

Sorry. I ment to give the points to Chase707. Can it be changed ???

 

by: Chase707Posted on 2002-06-02 at 23:11:25ID: 7050420

I'm not sure about changing it, but you can create another question called 'points for Chase707'.  Then when I post an answer, you can then accept it.  It will end up costing you 50 more points though.

Chase707

 

by: yonitPosted on 2002-06-02 at 23:15:27ID: 7050428

I will

20120131-EE-VQP-002

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