Microsoft Windows CE 3.0  

Using Flags to Control Caching

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The Windows CE Internet function flags enable an application to control when and how it uses the cache. These flags can be used alone or in combination with the dwFlagsparameter in functions that access data or resources on the Internet. The Windows CE Internet functions store all data downloaded from the Internet by default.

The following table shows values that can be used with the Windows CE Internet functions to control caching.

Value Description
INTERNET_FLAG_DONT_CACHE Does not cache the data, either locally or in any gateways. Identical to the preferred value, INTERNET_FLAG_NO_CACHE_WRITE.
INTERNET_FLAG_HYPERLINK Forces the application to reload a resource if no expire time and no last-modified time was returned when the resource was stored in the cache.
INTERNET_FLAG_MUST_CACHE_REQUEST Causes a temporary file to be created if the file cannot be cached. Identical to the preferred value, INTERNET_FLAG_NEED_FILE.
INTERNET_FLAG_NEED_FILE Causes a temporary file to be created if the file cannot be cached.
INTERNET_FLAG_NO_CACHE_WRITE Rejects any attempt by the function to store data downloaded from the Internet in the cache. This flag is necessary if the application does not require downloaded resources to be stored locally.
INTERNET_FLAG_OFFLINE Prevents the application from making requests to the network. All requests are resolved using the resources stored in the cache. If the resource is not in the cache, a suitable error, such as ERROR_FILE_NOT_FOUND, is returned.
INTERNET_FLAG_RELOAD Forces the function to retrieve the requested resource directly from the Internet. The data that is downloaded is stored in the cache.
INTERNET_FLAG_RESYNCHRONIZE Causes an application to perform a conditional download of the resource from the Internet. If the version stored in the cache is current, the data is downloaded from the cache. Otherwise, the data is reloaded from the server.


 Last updated on Friday, April 02, 2004

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