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ihttpfileinfo-getvrtoken-method.md

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title IHttpFileInfo::GetVrToken Method
description Learn how the IHttpFileInfo::GetVrToken method returns the virtual token for the corresponding file.
ms.date 10/07/2016
ms.assetid 7a240fb1-dbff-a43b-418c-fa59d2c67d70

IHttpFileInfo::GetVrToken Method

Returns the virtual token for the corresponding file.

Syntax

virtual HANDLE GetVrToken(  
   VOID  
) const = 0;

Parameters

This method takes no parameters.

Return Value

A HANDLE to the virtual token; otherwise, NULL.

Remarks

The behavior of the GetVrToken method is implementation specific. You should use the following information as a guideline, but it may not be correct in all scenarios:

  • Implementers that reference an Internet file return a valid HANDLE.

  • Implementers that reference a non-Internet file return NULL.

Caution

Because some implementers return NULL on the GetVrToken method, always test for this condition before using the returned HANDLE.

Notes for Implementers

IHttpFileInfo implementers are responsible for resource management with this data; therefore, IHttpFileInfo implementers must call CloseHandle on the HANDLE when it is no longer needed.

Notes for Callers

IHttpFileInfo implementers are responsible for resource management with this data; therefore, IHttpFileInfo clients must not call CloseHandle on the returned HANDLE when this data is no longer needed. Furthermore, clients must not change the state of the memory referenced by this HANDLE; otherwise, an access violation will be thrown or the data will become invalid.

Example

The following code example demonstrates how to use the IHttpContext::GetFileInfo method to create an HTTP module that retrieves a pointer to an IHttpFileInfo interface for the current request. The example then calls the GetVrToken method to retrieve virtual token information for the requested file and displays this information to a Web client.

[!code-cppIHttpFileInfo#15]

The following text is a sample of the data output from the preceding code example.

HTTP/1.1 200 OK  
content-Type:text/plain  
Server: Microsoft-IIS/7.0  
Date: Thu, 15 Dec 2005 22:22:09 GMT  
Content-Length: 17  
  
VR Token:  NULL

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

IHttpFileInfo Interface