Persistent URL Cache Functions

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This section describes the functions used by applications that need persistent caching services. These functions allow an application to save data in the local file system for subsequent use, such as in situations where access to the data is over a low bandwidth link, or the access is not available at all. The calling program that inserts data into the persistent cache assigns a source name that is used to do operations such as retrieve the data, set and get some properties on the data, and delete data.

The protocols implemented in Microsoft® Win32® Internet functions use the cache functions to provide persistent caching and offline browsing. Unless explicitly specified not to cache through the INTERNET_FLAG_NO_CACHE_WRITE flag, Win32 Internet functions cache all data downloaded from the network. The responses to POST data are not cached.

CommitUrlCacheEntry	Stores data in the specified file in the Internet cache and associates it with the given URL.
CreateUrlCacheEntry	Creates a local file name for saving the cache entry based on the specified URL and the file extension.
CreateUrlCacheGroup	Generates cache group identifications.
DeleteUrlCacheEntry	Removes the file associated with the source name from the cache, if the file exists.
DeleteUrlCacheGroup	Releases the specified GROUPID and any associated state in the cache index file.
FindCloseUrlCache	Closes the specified cache enumeration handle.
FindFirstUrlCacheEntry	Begins the enumeration of the Internet cache.
FindFirstUrlCacheEntryEx	Starts a filtered enumeration of the Internet cache.
FindFirstUrlCacheGroup	Initiates the enumeration of the cache groups in the Internet cache.
FindNextUrlCacheEntry	Retrieves the next entry in the Internet cache.
FindNextUrlCacheEntryEx	Finds the next cache entry in a cache enumeration started by the FindFirstUrlCacheEntryEx function.
FindNextUrlCacheGroup	Retrieves the next cache group in a cache group enumeration started by FindFirstUrlCacheGroup.
GetUrlCacheEntryInfo	Retrieves information about a cache entry.
GetUrlCacheEntryInfoEx	Searches for the URL after translating any cached redirections that would be applied in offline mode by HttpSendRequest.
GetUrlCacheGroupAttribute	Retrieves the attribute information of the specified cache group.
ReadUrlCacheEntryStream	Reads the cached data from a stream that has been opened using the RetrieveUrlCacheEntryStream function.
RetrieveUrlCacheEntryFile	Locks the cache entry file associated with the specified URL.
RetrieveUrlCacheEntryStream	Provides the most efficient and implementation-independent way of accessing the cache data.
SetUrlCacheEntryGroup	Adds entries to or removes entries from a cache group.
SetUrlCacheEntryInfo	Sets the specified members of the INTERNET_CACHE_ENTRY_INFO structure.
SetUrlCacheGroupAttribute	Sets the attribute information of the specified cache group.
UnlockUrlCacheEntryFile	Unlocks the cache entry that was locked while the file was retrieved for use from the cache.
UnlockUrlCacheEntryStream	Closes the stream that has been retrieved using the RetrieveUrlCacheEntryStream function.