---
UID: NF:comsvcs.IComActivityEvents.OnActivityEnter
title: IComActivityEvents::OnActivityEnter (comsvcs.h)
description: Generated when an activity thread is entered.
old-location: cos\icomactivityevents_onactivityenter.htm
tech.root: cossdk
ms.assetid: 5933798d-2208-4eab-8024-50236e5483a3
ms.date: 12/05/2018
ms.keywords: IComActivityEvents interface [COM+],OnActivityEnter method, IComActivityEvents.OnActivityEnter, IComActivityEvents::OnActivityEnter, OnActivityEnter, OnActivityEnter method [COM+], OnActivityEnter method [COM+],IComActivityEvents interface, _dtc_IComActivityEvents_OnActivityEnter, comsvcs/IComActivityEvents::OnActivityEnter, cos.icomactivityevents_onactivityenter
f1_keywords:
- comsvcs/IComActivityEvents.OnActivityEnter
dev_langs:
- c++
req.header: comsvcs.h
req.include-header: 
req.target-type: Windows
req.target-min-winverclnt: Windows 2000 Professional [desktop apps only]
req.target-min-winversvr: Windows 2000 Server [desktop apps only]
req.kmdf-ver: 
req.umdf-ver: 
req.ddi-compliance: 
req.unicode-ansi: 
req.idl: 
req.max-support: 
req.namespace: 
req.assembly: 
req.type-library: 
req.lib: 
req.dll: 
req.irql: 
topic_type:
- APIRef
- kbSyntax
api_type:
- COM
api_location:
- ComSvcs.h
api_name:
- IComActivityEvents.OnActivityEnter
targetos: Windows
req.typenames: 
req.redist: 
ms.custom: 19H1
---

# IComActivityEvents::OnActivityEnter


## -description


Generated when an activity thread is entered.


## -parameters




### -param pInfo [in]

A pointer to a <a href="https://docs.microsoft.com/windows/win32/api/comsvcs/ns-comsvcs-comsvcseventinfo">COMSVCSEVENTINFO</a> structure.


### -param guidCurrent [in]

The GUID associated with the caller.


### -param guidEntered [in]

The GUID associated with the activity thread entered.


### -param dwThread [in]

The identifier of the activity thread.


## -returns



The user verifies the return values from this method.




## -see-also




<a href="https://docs.microsoft.com/windows/desktop/api/comsvcs/nn-comsvcs-icomactivityevents">IComActivityEvents</a>
 

 

