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To debug your application in Eclipse, you can set a breakpoint in your Java code, as shown in Figure 1 30, by double clicking where the breakpoint (the little filled circle) should appear.

The wddx extension is not difficult to use, but alone it is not very useful. After all, it is called Web Distributed Data Exchange for a reason data is meant to be exchanged with other systems. In the following sections, I will present two examples. The first is another example of serializing and unserializing data. This will re-enforce what you have read in this chapter. The second example will take working with wddx a step further. It will show how you can create a Web service, both the client and server portions, using WDDX.

Now you ll create a Functional Areas list that is based on this content type. In SharePoint Designer, select the Lists and Libraries link in the Navigation pane, as shown in Figure 2-6.

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You have seen how to use the different data types in PHP when creating a WDDX packet. The following example brings them all together and demonstrates how a packet is created using a number of variables with different data types. Listing 15-2 shows the resulting WDDX packet from this code. < php /* Some variables to pass */ $myinteger = 1; $mystring = "My String"; $mysecondstring = "Second\nString"; $myarray = array('a', 'b', 'c'); $mystruct = array('key1'=>'a', 'key2'=>'b', 'key3'=>'c'); /* Multiple variables being serialized at once */ $serialized_out = wddx_serialize_vars('myinteger', 'mystring', 'mysecondstring', 'myarray', 'mystruct'); echo $serialized_out; >

CHAPTER 15 WEB DISTRIBUTED DATA EXCHANGE (WDDX)

Figure 1 30. Setting a breakpoint Then click the Debug icon in the Server window (Figure 1 31). Now go to the browser to load the page again. Eclipse will stop at the breakpoint (Figure 1 32). Then you can step through the program and check the variables and whatever else. To stop the debug ses sion, just stop or restart JBoss in normal mode.

Listing 15-2. Resulting WDDX Packet <wddxPacket version='1.0'> <header/> <data> <struct> <var name='myinteger'> <number>1</number> </var> <var name='mystring'> <string>My String</string> </var> <var name='mysecondstring'> <string>Second<char code='0A'/>String</string> </var> <var name='myarray'> <array length='3'> <string>a</string> <string>b</string> <string>c</string> </array> </var> <var name='mystruct'> <struct> <var name='key1'> <string>a</string> </var> <var name='key2'> <string>b</string> </var> <var name='key3'> <string>c</string> </var> </struct> </var> </struct> </data> </wddxPacket> The unserialization of this data, using the resulting $serialized_out from the serialization example represented by the packet in Listing 15-2, is performed with a single call: $arOut = wddx_deserialize($serialized_out); var_dump($arOut); The output, shown in Listing 15-3, is an array containing the values of each serialized variable that is associated with the original variable by the index of the array.

Figure 2-6. Selecting the Lists and Libraries page In the Ribbon, click the Custom List button, as shown in Figure 2-7.

CHAPTER 15 WEB DISTRIBUTED DATA EXCHANGE (WDDX)

Listing 15-3. Unserialized WDDX Packet array(5) { ["myinteger"]=> int(1) ["mystring"]=> string(9) "My String" ["mysecondstring"]=> string(13) "Second String" ["myarray"]=> array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" } ["mystruct"]=> array(3) { ["key1"]=> string(1) "a" ["key2"]=> string(1) "b" ["key3"]=> string(1) "c" } } Because you know the original structure, the following code quickly re-creates the original variables with their native types in PHP: foreach($arOut AS $key=>$value) { $$key = $value; } var_dump($myinteger); As you can see from the output, the $myinter variable, which was set in the original script, is re-created with its original value: int(1) Of course, for more complex structures, this little piece of code simply wouldn t do, but it should give you a starting point if you want to expand it to support the different data types in WDDX.

Summary

CHAPTER 15 WEB DISTRIBUTED DATA EXCHANGE (WDDX)

Figure 2-7. Clicking the Custom List button In the dialog box that appears, enter the name Functional Areas, as shown in Figure 2-8, and click the OK button.

I have broken this example into two parts. I will show how to create a server component that is designed to run beneath a Web server and how to create a client component. The client piece is generic and written for the command line, but you can expand and embed it in a local Web page. The service allows the client to request a record based on an ID from a database. The request is packaged in a WDDX packet. The server receives the packet unserialized, and the requested record returned is packaged in a WDDX packet to the client.

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