Apple WebObjects 3.5 Manuel d'utilisateur télécharger pdf (Page 58)

Chapter 4 Debugging a WebObjects Application

executable in the launch panel. Output from the debugging methods appears in

the launch panel.

Debugging Objective-C

If all or part of your application is written in Objective-C, you can use the gdb

debugger in Project Builder. For more information on debugging an Objective-

C application with Project Builder, see Project Builder’s online help.

If your application contains WebScript code as well as Objective-C code, you

debug the WebScript portion using

logWithFormat: and WOApplication trace

statements as described in “Debugging Techniques” (page 58).

Debugging Mixed Applications

When you build a WebObjects application project, the result is a .woa ﬁle

package inside of the project directory. You may notice that this ﬁle package

contains all of the application’s components (including scripted components),

and all other resources need to run the application, as well as the application

executable itself.

When you’re debugging an application, the executable uses the components

from the project directory instead of those in the

.woa package, so you can safely

ignore the components placed inside of the

.woa package. When you need to

make a change, change the component in the project directory. When you run

an application, it checks to see if its

.woa package is inside of a project directory

(that is, a directory that contains a ﬁle named

PB.project). If it is, the application

takes its scripted components from the project directory. This way, you can

make any necessary changes to your scripts in Project Builder, and (once you

have saved the scripts) your application automatically picks up your changes

without your having to rebuild.

Debugging Techniques

To debug WebScript and Java code, you rely primarily on log messages and trace

statements that write to standard output. This section describes the statements

you can include in your code to help you debug.

Writing Debug Messages

The method logWithFormat: (in Java, logString) writes a formatted string to standard

error (

stderr).

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Apple WebObjects 3.5 Manuel d'utilisateur Page 58