---
title: "_com_ptr_t::QueryInterface"
ms.date: "11/04/2016"
f1_keywords: ["_com_ptr_t::QueryInterface", "_com_ptr_t.QueryInterface"]
helpviewer_keywords: ["QueryInterface method [C++]"]
ms.assetid: d03292f1-6b02-40db-9756-8b0837a97319
---
# _com_ptr_t::QueryInterface

**Microsoft Specific**

Calls the **QueryInterface** member function of `IUnknown` on the encapsulated interface pointer.

## Syntax

```
template<typename _InterfaceType> HRESULT QueryInterface (
   const IID& iid,
   _InterfaceType*& p
) throw ( );
template<typename _InterfaceType> HRESULT QueryInterface (
   const IID& iid,
   _InterfaceType** p
) throw( );
```

#### Parameters

*iid*<br/>
`IID` of an interface pointer.

*p*<br/>
Raw interface pointer.

## Remarks

Calls `IUnknown::QueryInterface` on the encapsulated interface pointer with the specified `IID` and returns the resulting raw interface pointer in *p*. This routine returns the HRESULT to indicate success or failure.

**END Microsoft Specific**

## See also

[_com_ptr_t Class](../cpp/com-ptr-t-class.md)