Microsoft Internet Security and Acceleration Server 2000


The GetFilterVersion function is the first entry-point function called by the ISA Web proxy service on your Web (ISAPI) filter and must be present for the filter to work properly. Its declaration is:

BOOL WINAPI GetFilterVersion(


Points to the HTTP_FILTER_VERSION structure that contains both the version information for the server and members with which the filter can indicate filter version number, notifications, and priority desired. There is also a space for the filter application to provide a descriptive text.

Return Values

If this function returns TRUE, the filter will remain loaded. If the function returns FALSE, the filter will not receive any event notifications.

Note  It is important to register only for those notifications that are necessary for your filter's purposes. Registering for additional notifications will reduce performance.