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CHAPTER 5: Interapplication Communication with Scripts Communicating through messages 173

To change the default behavior set the BridgeTalk.onReceive property to a function definition in the

following form:

BridgeTalk.onReceive = function( bridgeTalkObject ) {

// callback definition here

};

The body property of the received message object contains the received data.

The function can return any type.

The function that you define does not need to explicitly create and return a

BridgeTalk message object.

The messaging framework creates a new

BridgeTalk message object, and packages the return value of

the

onReceive handler as a string in the body property of that object.

Return values are flattened into a string using the Unicode Transformation Format-8 (UTF-8) encoding. If

the function does not specify a return value, the resulting string is the empty string.

The result object is transmitted back to the sender if the sender has implemented an

onResult callback for

the original message.

Message-handling examples

This example shows the default mechanism for handling unsolicited messages received from other

applications. This simple handler executes the message’s data as a script and returns the results of that

execution.

BridgeTalk.onReceive = function (message) {

return eval( message.body );

}

This example shows how you might extend the receive handler to process a new type of message.

BridgeTalk.onReceive = function (message) {

switch (message.type) {

case "Data":

return processData( message );

break;

default: //"ExtendScript"

return eval( mesage.body );

}

Handling responses from the message target

To handle responses to a message you have sent, you define callback handler functions in the message

object itself. The target application cannot send a response message back to the sender unless the

message object it received has the appropriate callback defined.

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

When your message is received by its target, the target application’s static

BridgeTalk object’s onReceive

method processes that message, and can invoke one of the message object’s callbacks to return a

response. In each case, the messaging framework packages the response in a new message object, whose

target application is the sender. Your callback functions receive this response message object as an

argument.

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