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Steps in a Typical Internet Client Application


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The latest version of this topic can be found at Steps in a Typical Internet Client Application.

The following table shows the steps you might perform in a typical Internet client application.

Your goalActions you takeEffects
Begin an Internet session.Create a CInternetSession object.Initializes WinInet and connects to server.
Set an Internet query option (time-out limit or number of retries, for example).Use CInternetSession::SetOption.Returns FALSE if operation was unsuccessful.
Establish a callback function to monitor the status of the session.Use CInternetSession::EnableStatusCallback.Establishes a callback to CInternetSession::OnStatusCallback. Override OnStatusCallback to create your own callback routine.
Connect to an Internet server, intranet server, or local file.Use CInternetSession::OpenURL.Parses the URL and opens a connection to the specified server. Returns a CStdioFile (if you pass OpenURL a local file name). This is the object through which you access data retrieved from the server or file.
Read from the file.Use CInternetFile::Read.Reads the specified number of bytes using a buffer you supply.
Handle exceptions.Use the CInternetException class.Handles all common Internet exception types.
End the Internet session.Dispose of the CInternetSession object.Automatically cleans up open file handles and connections.

Win32 Internet Extensions (WinInet)
Prerequisites for Internet Client Classes
Writing an Internet Client Application Using MFC WinInet Classes