Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All

dual

Places an interface in the .idl file as a dual interface.

[dual]

Attribute Context

Applies to interface
Repeatable No
Required attributes None
Invalid attributes dispinterface

For more information, see Attribute Contexts.

Remarks

When the dual C++ attribute precedes an interface, it causes the interface to be placed inside the library block in the generated .idl file.

Example

The following code is an attribute block that uses dual before an interface definition:

// cpp_attr_ref_dual.cpp
// compile with: /LD
#include <windows.h>
[module(name="MyLibrary")];

[uuid("2F5F63F1-16DA-11d2-9E7B-00C04FB926DA"), dual]

__interface IStatic : IDispatch 
{
   HRESULT Func1(int i);
   [   propget, 
      id(1), 
      bindable, 
      displaybind, 
      defaultbind, 
      requestedit
   ] 
   HRESULT P1([out, retval] long *nSize);
   [   propput, 
      id(1), 
      bindable, 
      displaybind, 
      defaultbind, 
      requestedit
   ] 
   HRESULT P1([in] long nSize);    
};

[cpp_quote("#include file.h")];

See Also

IDL Attributes | Attributes by Usage | custom | dispinterface | object | interface, __interface | Attributes Samples

Show:
© 2015 Microsoft