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title: "_com_ptr_t::AddRef | Microsoft Docs"
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---
# _com_ptr_t::AddRef
**Microsoft Specific**  
  
 Calls the `AddRef` member function of **IUnknown** on the encapsulated interface pointer.  
  
## Syntax  
  
```  
  
void AddRef( );  
  
```  
  
## Remarks  
 Calls `IUnknown::AddRef` on the encapsulated interface pointer, raising an `E_POINTER` error if the pointer is **NULL**.  
  
 **END Microsoft Specific**  
  
## See Also  
 [_com_ptr_t Class](../cpp/com-ptr-t-class.md)