Prerequisites for Internet Client Classes

|  Overview |  How Do I

Some actions taken by an Internet client (reading a file, for example) have prerequisite actions (in this case, establishing an Internet connection). The following tables list the prerequisites for some client actions.

General Internet URL (FTP, Gopher, or HTTP)

Action	Prerequisite
Establish a connection.	Create a to establish the basis of an Internet client application.
Open a URL.	Establish a connection. Call . The OpenURL function returns a read-only resource object.
Read URL data.	Open the URL. Call .
Query the setting of an Internet option.	Establish a connection. Call .
Set an Internet option.	Establish a connection. Call .
Set a function to be called with status information.	Establish a connection. Call . Override to handle calls.

FTP

Action	Prerequisite
Establish an FTP connection.	Create a as the basis of this Internet client application. Call to create a object.
Find the first resource.	Establish an FTP connection. Create a object. Call .
Enumerate all available resources.	Find the first file. Call until it returns FALSE.
Open an FTP file.	Establish an FTP connection. Call to create and open a object.
Read an FTP file.	Open an FTP file with read access. Call .
Write to an FTP file.	Open an FTP file with write access. Call .
Change the client's directory on the server.	Establish an FTP connection. Call .
Retrieve the client's current directory on the server.	Establish an FTP connection. Call .

HTTP

Action	Prerequisite
Establish an HTTP connection.	Create a as the basis of this Internet client application. Call to create a object.
Open an HTTP file.	Establish an HTTP connection. Call to create a object. Call . Call .
Read an HTTP file.	Open an HTTP file. Call .
Get information about an HTTP request.	Establish an HTTP connection. Call to create a object. Call .

Gopher

Action	Prerequisite
Establish a gopher connection.	Create a as the basis of this Internet client application. Call to create a .
Find the first file in the current directory.	Establish a gopher connection. Create a object. Call to create a object. Pass the locator to . Call to get the locator of a file if you need it later.
Enumerate all available files.	Find the first file. Call until it returns FALSE.
Open a gopher file.	Establish a gopher connection. Create a gopher locator with or find a locator with . Call .
Read a gopher file.	Open a gopher file. Use .