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CHAPTER 5: Interapplication Communication with Scripts Communicating through messages 171

var bt = new BridgeTalk;

// send this msg to the Adobe Bridge CS4 application

var targetApp = BridgeTalk.getSpecifier( "bridge-3.0");

bt.target = targetApp;

// the script to evaluate is contained in a string in the "body" property

bt.body = "new Document(’C:\\BridgeScripts’);

app.document.target.children.length;"

Step 3: Specify how to handle a response

If you want to handle a response for this message, or use the data that is returned from the script’s

evaluation, you must set up the response-handling mechanism before you send the message. You do this

by defining the onResult

callback in the message object.

OTE: The message callbacks are optional, and are not implemented by all message-enabled applications.

The response to a message is, by default, the result of evaluation of the script contained in that message’s

body property. The target application might define some different kind of response; see “Receiving

messages” on page 172.

When the target has finished processing this message, it looks for an

onResult callback in the message

object it received. If it is found, the target automatically invokes it, passing it the response. The response is

packaged into a string, which is in turn packaged into the

body property of a new message object. That

message object is the argument to your

onResult callback function.

This handler, for example, processes the returned result using a script-defined

processResult function.

bt.onResult = function(returnBtObj)

{ processResult(returnBtObj.body); }

If you want to handle errors that might arise during script processing, you can define an onError callback in

the message object. Similarly, you can define a timeout

value and onTimeout callback to handle the case

where the target cannot process the message within a given time. For more information, see “

Handling

responses from the message target” on page 173.

OTE: If you define callbacks to handle a response, you must store the message in a variable that still exists

when the response is received. Otherwise, JavaScript might garbage-collect the message object, and the

response would be lost.

Step 4: Send the message

To send the message, call the message object’s

send method. You do not need to specify where to send

the message to, since the target application is set in the message itself.

bt.send();

You can optionally specify a timeout value, which makes the call synchronous; when you do this, the

method waits for a response from the target application, or for the timeout value to expire, before

returning. When a timeout is not specified, as in this example, the call is asynchronous and the

send()

method returns immediately.

A second optional parameter allows you to specify launch parameters, in case the target application is not

currently running, and the messaging framework needs to launch it.

The complete script looks like this:

// script to be executed in Photoshop CS4

#target "photoshop-11.0"

// check that the target app is installed

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