Compiler Warning (level 1) C4096


For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

'a': interface is not a COM interface; will not be emitted to IDL

An interface definition that you may have intended as a COM interface was not defined as a COM interface and therefore will not be emitted to the IDL file.

See Interface Attributes for a list attributes that indicate an interface is a COM interface.

The following sample generates C4096:

// C4096.cpp  
// compile with: /W1 /LD  
#include "windows.h"  
// [object, uuid("00000000-0000-0000-0000-000000000001")]  
__interface a  
[coclass, uuid("00000000-0000-0000-0000-000000000002")]  
struct b : a  
};   // C4096, remove coclass or uncomment object