Apple WebObjects 3.5 - Manual (Page 183)

WebScript for Objective-C Developers
183
The following example is a simple category of WORequest that gets the
sender’s Internet e-mail address from the request headers (“From” key)
and returns it (or “None”).
@implementation WORequest(RequestUtilities)
- emailAddressOfSender {
NSString *address = [self headerForKey:@"From"];
if (!address) address = @"None";
return address;
}
@end
Elsewhere in your WebScript code, you invoke this method on WORequest
objects just as you do with any other method of that class. Here’s an
example:
- takeValuesFromRequest:request inContext:context {
[super takeValuesFromRequest:request inContext:context];
[self logWithFormat:@"Email address of sender: %@",
[request emailAddressOfSender]];
}
The category must be included either at the end of a component’s script file
(that is, a script file within a
.wo ) or it must be included in a scripted class’s
stand-alone script file. Do not place categories in the application or session
script.
WebScript for Objective-C Developers
WebScript uses a subset of Objective-C syntax, but its role within an
application is significantly different. The following table summarizes some
of the differences.
Objective-C WebScript
Is compiled Is interpreted
Supports primitive C data types Supports only the class type
Performs type checking at compiled time Never performs type checking
Requires method prototyping Doesn’t require method prototyping (that is, you don’t
declare methods before you use them)
Usually involves a .h and a .m file Stands alone (unless inside of a component directory)
Supports all C language features Has limited support for C language features; for example,
doesn’t support structures, pointers, enumerations, or
unions