Passing arrays of structs from C# web service to raw C++?

[WTH]

I have a C# webservice that returns an array of struct data back to a
calling client.

It works fine when tested via the ASMX page; however, I don't know how to
make the call to this particular method from C++.

If my web method is declared as:

public MyStruct[] GetData()

and returns back a web service allocated array of structs, how do I call
this from C++?

Intellisense tells me that the signature (to C++) is:

GetData( MyService::MyStruct** GetDataResult, int* GetDataResult_nSizeIs )

How am I supposed to be declaring the C++ local variable I want the results
returned in?

Am I supposed to pre-allocate an array of structs to receive the data?
Am I supposed to supply an array of struct pointers and then I'm responsible
for releasing them?

I am having a hard time finding documentation on this...

Thanks,
WTH

[DC]

you need to look at p/invoke,
try the interop newsgroup.

The high-order bit here is not webservices, but p/invoke.

"WTH" <sp*******@Ih8it.com> wrote in message
news:%2****************@tk2msftngp13.phx.gbl...

I have a C# webservice that returns an array of struct data back to a
calling client.

It works fine when tested via the ASMX page; however, I don't know how to
make the call to this particular method from C++.

If my web method is declared as:

public MyStruct[] GetData()

and returns back a web service allocated array of structs, how do I call
this from C++?

Intellisense tells me that the signature (to C++) is:

GetData( MyService::MyStruct** GetDataResult, int* GetDataResult_nSizeIs )

How am I supposed to be declaring the C++ local variable I want the
results
returned in?

Am I supposed to pre-allocate an array of structs to receive the data?
Am I supposed to supply an array of struct pointers and then I'm
responsible
for releasing them?

I am having a hard time finding documentation on this...

Thanks,
WTH

[WTH]

DC <di****@online.microsoft.com> loquated like no one had ever loquated
before with:

you need to look at p/invoke,
try the interop newsgroup.

The high-order bit here is not webservices, but p/invoke.

Could you give me a little clarification about that before I go to the
interop ng?

I mean, I trace it into the ATL soap code and see where an ATL function
asserts that the pointer I pass in is not NULL, and then, and the end of
this same method, it calls:

*in_pMyPoint = _params.AtlCopyOfMyStructure

WTH