COM object that returns a string

Hello. I have written a Class Library in C# that has two methods:

GetNumber returns 17
GetName returns foo

I am able to add a reference to the COM object from an ASP.NET page,
call both methods, and display the correct results in labels on the
Web page.

I also want to be able to instantiate the COM object in a C++ program
and call both methods. I can instantiate the COM object successfully.
When I call GetNumber from the C++ program, I get 17. But, when I
call
GetName, I get garbage. I am guessing this has something to do with
the marshalling and how it is handling strings. I need to be able to
call the GetName method in the C# COM object from my C++ program to
get foo.

Does anyone have any ideas how to resolve this? Thanks in advance for
your help.

Justin

use BSTR in C++ function.


<JustinInAtlanta (AT) gmail (DOT) com> wrote

Hello. I have written a Class Library in C# that has two methods:

GetNumber returns 17
GetName returns foo

I am able to add a reference to the COM object from an ASP.NET page,
call both methods, and display the correct results in labels on the
Web page.

I also want to be able to instantiate the COM object in a C++ program
and call both methods. I can instantiate the COM object successfully.
When I call GetNumber from the C++ program, I get 17. But, when I
call
GetName, I get garbage. I am guessing this has something to do with
the marshalling and how it is handling strings. I need to be able to
call the GetName method in the C# COM object from my C++ program to
get foo.

Does anyone have any ideas how to resolve this? Thanks in advance for
your help.

Justin