struct output parameter

[Urs Wigger]

In a Managed C++ module, I have a function returning an integer as
output parameter:

bool Func1( [System::Runtime::InteropServices::Out] int __gc *iout)
{
*iout = 33;
return true;
}

Calling Func1 from a C# application works correctly:

int iValue;
Func1(out iValue); // iValue correctly returned as 33

However, if using s struct parameter, I don't get the data returned

MC++:

__value struct MyStruct
{
public __value double dVal1;
public __value double dVal2;
};

MyStruct m_data; // membe var

bool Func2( [System::Runtime::InteropServices::Out] MyStruct __gc *pOut)
{
m_data.dVal1 = 11;
m_data.dVal2 = 22;

*pOut = m_data; // does not work - crashes application

pOut = &m_data; // Function call succeedes, but m_data does not
arrive in C# app
return true;
}

C#:

MyStruct data = new MyStruct ();
Func2(out data); // data is empty

How do I pass a struct output parameter correctly from MC++ to C# ???
Any help is appreciated
Regards Urs

[Eric Gunnerson [MS]]

It looks to me like the problem is on the C++ side. Have you tried the
languages.vc newsgroup?

--
Eric Gunnerson

Visit the C# product team at http://www.csharp.net
Eric's blog is at http://blogs.gotdotnet.com/ericgu/

This posting is provided "AS IS" with no warranties, and confers no rights.
"Urs Wigger" <ns_urs.wigger@leica-geosystems_ns.com> wrote in message
news:eg*************@TK2MSFTNGP11.phx.gbl...

In a Managed C++ module, I have a function returning an integer as
output parameter:

bool Func1( [System::Runtime::InteropServices::Out] int __gc *iout)
{
*iout = 33;
return true;
}

Calling Func1 from a C# application works correctly:

int iValue;
Func1(out iValue); // iValue correctly returned as 33

However, if using s struct parameter, I don't get the data returned

MC++:

__value struct MyStruct
{
public __value double dVal1;
public __value double dVal2;
};

MyStruct m_data; // membe var

bool Func2( [System::Runtime::InteropServices::Out] MyStruct __gc *pOut)
{
m_data.dVal1 = 11;
m_data.dVal2 = 22;

*pOut = m_data; // does not work - crashes application

pOut = &m_data; // Function call succeedes, but m_data does not
arrive in C# app
return true;
}

C#:

MyStruct data = new MyStruct ();
Func2(out data); // data is empty

How do I pass a struct output parameter correctly from MC++ to C# ???
Any help is appreciated
Regards Urs