|Important||This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.|
Creates and initializes a single or several simultaneous Internet sessions and, if necessary, describes your connection to a proxy server.
If your Internet connection must be maintained for the duration of an application, you can create a CInternetSession member of the class CWinApp.
Once you have established an Internet session, you can call OpenURL. CInternetSession then parses the URL for you by calling the global function AfxParseURL. Regardless of its protocol type, CInternetSession interprets the URL and manages it for you. It can handle requests for local files identified with the URL resource "file://". OpenURL will return a pointer to a CStdioFile object if the name you pass it is a local file.
If you open a URL on an Internet server using OpenURL, you can read information from the site. If you want to perform service-specific (for example, HTTP, FTP, or gopher) actions on files located on a server, you must establish the appropriate connection with that server. To open a particular kind of connection directly to a particular service, use one of the following member functions:
GetGopherConnection to open a connection to a gopher service.
GetHttpConnection to open a connection to an HTTP service.
GetFtpConnection to open a connection to an FTP service.
SetOption allows you to set the query options of your session, such as time-out values, number of retries, and so on.
CInternetSession member functions SetCookie, GetCookie, and GetCookieLength provide the means to manage a Win32 cookie database, through which servers and scripts maintain state information about the client workstation.
For more information about basic Internet programming tasks, see the article Internet First Steps: WinInet. For general information about using the MFC WinInet classes, see the article Internet Programming with WinInet.
CInternetSession will throw an AfxThrowNotSupportedException for unsupported service types. Only the following service types are currently supported: FTP, HTTP, gopher, and file.
The Smart Device version of CInternetSession Class does not support the following methods:
Smart Device MFC does not support FTP or Gopher classes. Also, the WinInet API for Windows CE does not support Cookies or Gopher.