Solved

Passing structure in COM

Posted on 2002-06-02
7
219 Views
Last Modified: 2010-04-02
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 !
0
Comment
Question by:yonit
  • 3
  • 3
7 Comments
 
LVL 4

Expert Comment

by:Chase707
ID: 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
0
 

Accepted Solution

by:
vcppmfc earned 50 total points
ID: 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.
0
 

Author Comment

by:yonit
ID: 7050387
What can be done for VB?
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 4

Expert Comment

by:Chase707
ID: 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.

0
 

Author Comment

by:yonit
ID: 7050408
Sorry. I ment to give the points to Chase707. Can it be changed ???
0
 
LVL 4

Expert Comment

by:Chase707
ID: 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
0
 

Author Comment

by:yonit
ID: 7050428
I will
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Errors will happen. It is a fact of life for the programmer. How and when errors are detected have a great impact on quality and cost of a product. It is better to detect errors at compile time, when possible and practical. Errors that make their wa…
Container Orchestration platforms empower organizations to scale their apps at an exceptional rate. This is the reason numerous innovation-driven companies are moving apps to an appropriated datacenter wide platform that empowers them to scale at a …
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

919 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now