The parameter f is a variable
of the type File. The function opens
the internet resource specified by the parameter url.
If needed, a user_name and password
can be specified. All the parameters are of the type String.
Return Value
An l-value
referring to the variable f is returned.
If an error occurs, an Error
value is returned.
Examples
Reading an image from the internet:
var File f;
f <- open_url( "http://upload.wikimedia.org/wikipedia/commons/d/d4/Hradschin_Prag.jpg");