Making an ATL Object Noncreatable

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The latest version of this topic can be found at Making an ATL Object Noncreatable.

You can change the attributes of an ATL-based COM object so that a client cannot directly create the object. In this case, the object would be returned through a method call on another object rather than created directly.

To make an object noncreatable

  1. Remove the OBJECT_ENTRY_AUTO for the object. If you want the object to be noncreatable but the control to be registered, replace OBJECT_ENTRY_AUTO with OBJECT_ENTRY_NON_CREATEABLE_EX_AUTO.

  2. Add the noncreatable attribute to the coclass in the .idl file. For example:

[  
   uuid(A1992E3D-3CF0-11D0-826F-00A0C90F2851), 
   helpstring("MyObject"), 
   noncreatable 
]  
   coclass MyObject  
{  
[default] interface IMyInterface;  
}

See Also

ATL Project Wizard
Visual C++ Project Types
Creating Desktop Projects By Using Application Wizards
Programming with ATL and C Run-Time Code
Fundamentals of ATL COM Objects
Default ATL Project Configurations