SF_REQ_SET_NEXT_READ_SIZE Callback Function
The SF_REQ_SET_NEXT_READ_SIZE form of the ServerSupportFunction callback function is used by raw-read Web filters to set the number of bytes that will be read during the next read event.
Syntax
BOOL WINAPI * ServerSupportFunction(
__in struct _HTTP_FILTER_CONTEXT* pfc,
__in enum SF_REQ_TYPE sfReq,
__in PVOID pData,
__in DWORD ul1,
DWORD ul2
);
Parameters
pfc
Pointer to the HTTP_FILTER_CONTEXT data structure that is associated with the current, active HTTP session. Pass the filter context in this parameter.sfReq
Specifies the particular support function that is to be executed by the Forefront TMG Web filter, in this case, SF_REQ_SET_NEXT_READ_SIZE.pData
Unused in this support function.ul1
Specifies the maximum size, in bytes, that will be read during the next read event.ul2
Unused in this support function.
Return Value
This callback function returns TRUE if the call is successful; otherwise, it returns FALSE. To obtain extended error information, call GetLastError.
Remarks
This support function is meaningful only for filters that respond to raw-read notifications and that return the status code SF_STATUS_REQ_READ_NEXT from their entry-point function HttpFilterProc.
This support function is not relevant to the implementation of ISAPI in Forefront TMG. It is provided for compatibility with Internet Information Services (IIS). If you use it in a Forefront TMG Web filter, you should not assume that the number of bytes read during the subsequent read operation will not exceed the value set in the ul1 parameter.
For more information about the types of event notifications that are sent to Web filters, see Event Notifications.
Requirements
| Server | Requires Windows Server 2008 R2 or Windows Server 2008 x64 Edition with SP2. |
| Version | Requires Forefront Threat Management Gateway (TMG) 2010. |
| Header | Declared in Wpxhttpfilt.h. |
| DLL | Requires W3Filter.dll. |
See Also
Send comments about this topic to Microsoft
Build date: 6/30/2010