RE: Forward Declare an interface for IDL

From:
changliw@online.microsoft.com (Charles Wang[MSFT])
Newsgroups:
microsoft.public.vc.atl
Date:
Fri, 14 Sep 2007 07:28:06 GMT
Message-ID:
<TyQTRDq9HHA.4200@TK2MSFTNGHUB02.phx.gbl>
Hi Juan,
The error seemed caused by uuid attribute. I performed a test at my side,
if uuid attribute was removed, the compilier error C3163 did not occur. I
will consult the Dev team on this issue to see what the root cause of this
issue is here and I will let you know the result. Since the process may
need a long time, could you please just leave me
(changliw_at_microsoft_dot_com) an email response so that I can timely
update you when I get the response from the Dev team.

However I did not reproduce your original issue at my side. Directly using
"[export]__interface IFace;" was also fine at my side. You may refer to my
code snippet:
//iface.h
#pragma once
[object, uuid("00000000-0000-0000-0000-000000000001"), library_block ]
__interface IFace:IDispatch {
   [ id(0) ] int int_data;
   [ id(5) ] BSTR bstr_data;
};

//--MyClass.h
#pragma once
#define _ATL_ATTRIBUTES 1
#include <atlbase.h>
#include <atlcom.h>
#include <comdef.h>

[export]
__interface IFace;

[coclass, uuid("00000000-0000-0000-0000-000000000002") ]
class MyClass
{
private:
    int m_i;
    BSTR m_bstr;
    IFace* m_pFace;

public:
    MyClass(void);
    ~MyClass(void);
    void AttachFace(IFace* pFace);
};

//myclass.cpp
#include "MyClass.h"
#include "IFace.h"
void MyClass::AttachFace(IFace* pFace)
{
    m_pFace = pFace;
    if(m_pFace->int_data==0)
                         m_pFace->int_data = 1;
}

For further research, is it convenient for you to send me an sample project
of yours so that I can reproduce your issue at my side?

If you have any other questions or concerns, please feel free to let me
know. Have a nice day!

Best regards,
Charles Wang
Microsoft Online Community Support
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