General Win32 Internet Functions

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The general Microsoft® Win32® Internet functions described in this section perform basic Internet file manipulations.

InternetAttemptConnect	Attempts to make a connection to the Internet.
InternetCheckConnection	Allows an application to check if a connection to the Internet can be established.
InternetCloseHandle	Closes a single Internet handle.
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.
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.
InternetGetLastResponseInfo	Retrieves the last Win32® Internet function error description or server response on the thread calling this function.
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.
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.
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.