EDOBE XDOM TAKE 6 IR - PRODUCTSHEET Spezifikationen PDF herunterladen (Seite 175)

CHAPTER 5: Interapplication Communication with Scripts Communicating through messages 175

bt.send();

Example: Handling any error

In this example, the

onError handler re-throws the error message within the sending application.

var bt = new BridgeTalk;

bt.onError = function (btObj) {

var errorCode = parseInt (btObj.headers ["Error-Code"]);

throw new Error (errorCode, btObj.body);

}

Example: Handling expected errors and responses

This example creates a message that asks Adobe Bridge to return XMP metadata for a specific file. The

onResult method processes the data using a script-defined processFileSize function. Any errors are

handled by the

onError method. For example, if the file requested is not an existing file, the resulting error

is returned to the

onError method.

var bt = new BridgeTalk;

bt.target = "bridge-3.0";

bt.body = "var tn = new Thumbnail(’C/MyPhotos/temp.gif’);

tn.core.immediate.size;"

bt.onResult = function( resultMsg ) {

processFileSize(resultMsg.body);

}

bt.onError = function( errorMsg ) {

var errCode = parseInt (errorMsg.headers ["Error-Code"]);

throw new Error (errCode, errorMsg.body);

}

bt.send();

Example: Setting up a target to send multiple responses

This example integrates the sending of multiple responses with the evaluation of a message body. It sets

up a handler for a message such as the one sent in the following example.

The target application (Adobe Bridge) defines a static onReceive

method to allow for a new type of

message, which it calls an iterator. An

iterator type of message expects the message.body to use the

iteration variable

i within the script, so that different results are produced for each pass through the while

loop. Each result is sent back to the sending application with the sendResult()

method. When the

message.body has finished processing its task, it sets a flag to end the while loop.

// Code for processing the message and sending intermediate responses

// in the target application (Adobe Bridge)

BridgeTalk.onReceive = function (message){

switch (message.type) {

case "iterator":

done = false;

i = 0;

while (!done) {

// the message.body uses "i" to produce different results

// for each execution of the message.

// when done, the message.body sets "done" to true

// so this onReceive method breaks out of the loop.

message.sendResult(eval(message.body));

i++; }

break;

default: //"ExtendScript"

return eval( message.body );

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