Solved

Question on marshalling C# enums for COM interop

Posted on 2009-06-29
3
868 Views
Last Modified: 2013-11-10
I have a function in C# that takes in an array of an enum. For some reason I can't seem to get this to make itself visible to COM properly. In the VB6 object browser the function parameter reads <Unsupported Variant Type>.

Here is my function from my public interface:
void CurveListRequest (string RequestID, CurveNameConstants[] Curves);

The parameter 'CurveNameConstants[]' is an enum. Is there any way to make this work so someone using VB6 or VBA could enter the enums into the function?

I have tried several of the MarshalAs attribute types but none of them seem to solve the issue.
0
Comment
Question by:soulaco
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 39

Accepted Solution

by:
abel earned 500 total points
ID: 24740921
It seems that VB can only do in/out arrays. Check the following post with a similar problem, below the page is the solution: http://www.eggheadcafe.com/forumarchives/NETFrameworkinterop/Oct2005/post24405866.asp
0
 

Author Comment

by:soulaco
ID: 24744941
The solution there doesn't seem to work for me. My enum is public and the function is defined as follows:

void CurveListRequest (string RequestID, ref CurveNameConstants[] Curves)
This is how the function looks in the typelib:

HRESULT CurveQuoteRequest( [in] BSTR RequestID,  [in, out] SAFEARRAY(unsigned int)* Curves);

It doesn't show the parameter as being of the enum type.

When I try to use the function, it gives me an error.

How do you marshall an array of enums for use in COM?
0
 
LVL 39

Expert Comment

by:abel
ID: 24745386
you graded low, that means that you were perhaps not completely satisfied with the answer, but you graded and closed the question. Don't expect experts to come back at a question if you close it and don't expect them to come back at all when you clearly show that you don't like the answer and don't want to pursue it further.

On closing: http://www.experts-exchange.com/help.jsp?hi=407 and http://www.experts-exchange.com/help.jsp?hi=403.

On reopening: http://www.experts-exchange.com/help.jsp?hi=404
0

Featured Post

Space-Age Communications Transitions to DevOps

ViaSat, a global provider of satellite and wireless communications, securely connects businesses, governments, and organizations to the Internet. Learn how ViaSat’s Network Solutions Engineer, drove the transition from a traditional network support to a DevOps-centric model.

Question has a verified solution.

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

If you’re thinking to yourself “That description sounds a lot like two people doing the work that one could accomplish,” you’re not alone.
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…

751 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