Win32 Internet API Functions

The Win32 Internet API functions have been organized in the following categories.

The following table contains an alphabetical list of the functions provided by the Microsoft® Win32® Internet API.

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.
FtpCommand	Allows an application to send commands directly to an FTP server.
FtpCreateDirectory	Creates a new directory on the FTP server.
FtpDeleteFile	Deletes a file stored on the FTP server.
FtpFindFirstFile	Searches the specified directory of the given FTP session. File and directory entries are returned to the application in the WIN32_FIND_DATA structure.
FtpGetCurrentDirectory	Retrieves the current directory for the specified FTP session.
FtpGetFile	Retrieves a file from the FTP server and stores it under the specified file name, creating a new local file in the process.
FtpGetFileSize	Retrieves the file size of the requested FTP resource.
FtpOpenFile	Initiates access to a remote file on an FTP server for reading or writing.
FtpPutFile	Stores a file on the FTP server.
FtpRemoveDirectory	Removes the specified directory on the FTP server.
FtpRenameFile	Renames a file stored on the FTP server.
FtpSetCurrentDirectory	Changes to a different working directory on the FTP server.
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.
GopherCreateLocator	Creates a Gopher or Gopher+ locator string from its component parts.
GopherFindFirstFile	Uses a Gopher locator and some search criteria to create a session with the server and locate the requested documents, binary files, index servers, or directory trees.
GopherGetAttribute	Retrieves the specific attribute information from the server.
GopherGetLocatorType	Parses a Gopher locator and determines its attributes.
GopherOpenFile	Begins reading a Gopher data file from a Gopher server.
HttpAddRequestHeaders	Adds one or more HTTP request headers to the HTTP request handle.
HttpEndRequest	Ends an HTTP request that was initiated by HttpSendRequestEx.
HttpOpenRequest	Creates an HTTP request handle.
HttpQueryInfo	Retrieves header information associated with an HTTP request.
HttpSendRequest	Sends the specified request to the HTTP server.
HttpSendRequestEx	Sends the specified request to the HTTP server and allows chunked transfers.
InternetAttemptConnect	Attempts to make a connection to the Internet.
InternetAutodial	Causes the modem to automatically dial the default Internet connection.
InternetAutodialHangup	Disconnects an automatic dial-up connection.
InternetCanonicalizeUrl	Canonicalizes a URL, which includes converting unsafe characters and spaces into escape sequences.
InternetCheckConnection	Allows an application to check if a connection to the Internet can be established.
InternetCloseHandle	Closes a single Internet handle.
InternetCombineUrl	Combines a base and relative URL into a single URL. The resultant URL will be canonicalized (see InternetCanonicalizeUrl).
InternetConfirmZoneCrossing	Checks for changes between secure and nonsecure URLs. When a change occurs in security between two URLs, an application should allow the user to acknowledge this change, typically by displaying a dialog box.
InternetConnect	Opens an FTP, Gopher, or HTTP session for a given site.
InternetCrackUrl	Cracks a URL into its component parts.
InternetCreateUrl	Creates a URL from its component parts.
InternetDial	Initiates a connection to the Internet using a modem.
InternetErrorDlg	Displays a dialog box for the error that is passed to InternetErrorDlg, if an appropriate dialog box exists. If the FLAGS_ERROR_UI_FILTER_FOR_ERRORS flag is used, the function also checks the headers for any hidden errors and displays a dialog box if needed.
InternetFindNextFile	Continues a file search started as a result of a previous call to FtpFindFirstFile or GopherFindFirstFile.
InternetGetConnectedState	Retrieves the connected state of the local system.
InternetGetConnectedStateEx	Retrieves the connected state of the specified Internet connection.
InternetGetCookie	Retrieves the cookie for the specified URL.
InternetGetLastResponseInfo	Retrieves the last Win32® Internet function error description or server response on the thread calling this function.
InternetGoOnline	Prompts the user for permission to initiate connection to a URL.
InternetHangUp	Instructs the modem to disconnect from the Internet.
InternetInitializeAutoProxyDll	Not currently supported.
InternetLockRequestFile	Allows the user to place a lock on the file that is being used.
InternetOpen	Initializes an application's use of the Win32® Internet functions.
InternetOpenUrl	Begins reading a complete FTP, Gopher, or HTTP URL. Use InternetCanonicalizeUrl first if the URL being used contains a relative URL and a base URL separated by blank spaces.
InternetQueryDataAvailable	Queries the server to determine the amount of data available.
InternetQueryOption	Queries an Internet option on the specified handle.
InternetReadFile	Reads data from a handle opened by the InternetOpenUrl, FtpOpenFile, GopherOpenFile, or HttpOpenRequest function.
InternetReadFileEx	Reads data from a handle opened by the InternetOpenUrl, FtpOpenFile, GopherOpenFile, or HttpOpenRequest function.
InternetSetCookie	Creates a cookie associated with the specified URL.
InternetSetDialState	Obsolete. Do not use.
InternetSetFilePointer	Sets a file position for InternetReadFile. This is a synchronous call; however, subsequent calls to InternetReadFile might block or return pending if the data is not available from the cache and the server does not support random access.
InternetSetOption	Sets an Internet option.
InternetSetOptionEx	Not currently implemented.
InternetSetStatusCallback	Sets up a callback function that Win32® Internet functions can call as progress is made during an operation.
InternetTimeFromSystemTime	Formats a date and time according to the HTTP version 1.0 specification.
InternetTimeToSystemTime	Takes an HTTP time/date string and converts it to a SYSTEMTIME structure.
InternetUnlockRequestFile	Unlocks a file that was locked using InternetLockRequestFile.
InternetWriteFile	Writes data to an open Internet file.
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.