MACROMEDIA FLASH REMOTING MX-USING FLASH REMOTING FOR FLASH MX 2004 ACTIONSCRIPT 2.0 Spezifikationen PDF herunterladen (Seite 24)

This is the Title of the Book, eMatter Edition

Chapter 1: Introduction to Flash Remoting

service, and the onStatus( ) callback function is called if an error occurs. An object

used to receive results from a remote service is called a responder object (or some-

times called a response object).

Another way to trap events is to specify callback functions named the

same as the service name with _Result and _Status appended to it. This

technique, along with more information about callback functions and

responder objects, is covered in Chapters 3 and 4.

The System.onStatus property specifies the function to be called if the Flash Player

cannot connect to the server, as these types of errors are not handled by the onStatus( )

callback function for the remote service call. Example 1-1 sets

System.onStatus to exe-

cute our object’s onStatus( ) function. Once we have created an object and the call-

back functions to receive and process the data returned from the server, we are ready

to call the remote service.

Section 4 of Example 1-1 makes a connection to the server by passing in

myURL (ini-

tialized earlier) to the NetServices.createGatewayConnection( ) function. The server

connection information is stored in the

myServer variable. The example then gets a

reference to the remote service, which we store in the variable

myService, by calling

the getService( ) method on the

myServer variable initialized in the previous step. In

the call to getService( ), we pass

myServicePath to access the desired service and pass

our

myResult object to catch the data or status when the operation completes. We

can then use

myService (the reference to the remote service) to call methods on the

service, such as the sayHello( ) method.

The path passed to getService( ), as specified by myServicePath, does

not include a file extension for the remote service. Therefore, Flash

can access a remote service without knowing its implementation

details. One of the powerful aspects of Flash Remoting is that it makes

almost all server-side services accessible in a uniform manner. How-

ever, you cannot automatically detect which remote services are avail-

able. That is, you need to know the remote service methods you

intend to call. Flash Remoting has no mechanism in place to find

unknown remote services on the fly.

Save the Flash movie as HelloWorld.fla. Before the movie can be tested, we need to

create the server-side code that implements the sayHello( ) function, as described in

subsequent sections.

Example 1-1 utilizes the trace( ) command to display the data in the Output window

in the Flash authoring environment. Therefore, the output is visible only when the

movie is tested in the authoring environment and not when tested in a browser.

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