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ihttpcontext-gettracecontext-method.md

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title ms.date description ms.assetid
IHttpContext::GetTraceContext Method
10/07/2016
IHttpContext GetTraceContext method retrieves the trace context container for the current context.
49aa513f-da98-dd64-2aac-91abc2df844b

IHttpContext::GetTraceContext Method

Retrieves the trace context container for the current context.

Syntax

virtual IHttpTraceContext* GetTraceContext(  
   VOID  
) const = 0;

Parameters

This method takes no parameters.

Return Value

A pointer to an IHttpTraceContext interface.

Remarks

Use either the IHttpContext::GetTraceContext or IHttpServer::GetTraceContext method to retrieve an IHttpTraceContext interface when you need to raise an event that is associated with an HTTP request. When you need to raise an event that is not associated with an HTTP request, use only the IHttpServer::GetTraceContext method to retrieve an IHttpTraceContext interface.

Example

The following code example demonstrates how to create an HTTP module that performs the following tasks:

  1. Retrieves a pointer to an IHttpTraceContext interface by using the IHttpContext::GetTraceContext method.

  2. Retrieves the trace activity GUID by using the IHttpTraceContext::GetTraceActivityId method.

  3. Creates a string that contains the trace activity GUID and writes the string to the Event Viewer.

[!code-cppIHttpContextGetTraceContext#1]

Your module must export the RegisterModule function. You can export this function by creating a module definition (.def) file for your project, or you can compile the module by using the /EXPORT:RegisterModule switch. For more information, see Walkthrough: Creating a Request-Level HTTP Module By Using Native Code.

You can optionally compile the code by using the __stdcall (/Gz) calling convention instead of explicitly declaring the calling convention for each function.

Requirements

Type Description
Client - IIS 7.0 on [!INCLUDEwinvista]
- IIS 7.5 on Windows 7
- IIS 8.0 on Windows 8
- IIS 10.0 on Windows 10
Server - IIS 7.0 on [!INCLUDEwinsrv2008]
- IIS 7.5 on Windows Server 2008 R2
- IIS 8.0 on Windows Server 2012
- IIS 8.5 on Windows Server 2012 R2
- IIS 10.0 on Windows Server 2016
Product - IIS 7.0, IIS 7.5, IIS 8.0, IIS 8.5, IIS 10.0
- [!INCLUDEiisexp75], [!INCLUDEiisexp80], [!INCLUDEiisexp100]
Header Httpserv.h

See Also

IHttpContext Interface
IHttpServer::GetTraceContext Method
IHttpTraceContext Interface