IHttpContext::AllocateRequestMemory Method

Allocates a specified amount of memory.


virtual VOID* AllocateRequestMemory(  
   IN DWORD cbAllocation  
) = 0;  


[IN] The number of bytes to allocate.

Return Value

A pointer to VOID.


The AllocateRequestMemory method allocates an amount of memory that is specified by the cbAllocation parameter and has the lifetime of the current request. The server will automatically reclaim this memory at the end of the request.


The following code example demonstrates how to use the AllocateRequestMemory method to create an HTTP module that allocates a chunk of memory to retrieve the value of the HTTP User-Agent header.

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.


Type Description
Client - IIS 7.0 on Windows Vista
- IIS 7.5 on Windows 7
- IIS 8.0 on Windows 8
- IIS 10.0 on Windows 10
Server - IIS 7.0 on Windows Server 2008
- 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
- IIS Express 7.5, IIS Express 8.0, IIS Express 10.0
Header Httpserv.h

See Also

IHttpContext Interface