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To test regular expressions, you ll wrap matched patterns with <em> tags, which are styled in the test document to have top and bottom borders, as well as a yellow background. Accomplishing this with regexes is similar using str_replace() in PHP with the preg_replace() function. A pattern to match is passed, followed by a string (or pattern) to replace the matched pattern with. Finally, the string within which the search is to be performed is passed: preg_replace($pattern, $replacement, $string);

Here s what is returned if you can successfully reach the server but try to get a state name from betty.userland.com without giving the state number, which is a required parameter: $state_name = xmlrpc('http://betty.userland.com/RPC2', array('examples.getStateName')); The remote server returns the following: < xml version="1.0" > <methodResponse> <fault> <value> <struct> <member> <name>faultCode</name> <value> <int>7</int> </value> </member> <member> <name>faultString</name> <value> <string>Can't evaluate because the name 0 hasn t been defined.</string> </value> </member> </struct> </value> </fault> </methodResponse> The server was up and our communication with it is fine; the preceding code is returned with an HTTP response code of 200 OK. The error is identified by a fault code and a string describing the error in the XML response. Your error-handling code would be the same: $state_name = xmlrpc('http://betty.userland.com/RPC2', array('examples.getStateName')); if ($error = xmlrpc_error()) { if ($error->code <= 0) { $error->message = t('Outgoing HTTP request failed because the socket could not be opened.'); }

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abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. If it is not possible to recover from the error, display an alert panel that instructs the user to quit the application by pressing the Home button. */

drupal_set_message(t('Could not get state name because the remote site gave an error: %message (@code).', array( '%message' => $error->message, '@code' => $error->code ) ) ); This code results in the following message being displayed to the user: Could not get state name because the remote site gave an error: Can't evaluate the expression because the name 0 hasn t been defined. (7). Note that when you report errors, you should tell three things: what you were trying to do, why you can t do it, and additional information to which you have access. Often a friendlier error is displayed using drupal_set_message() to notify the user, and a more detailed error is written to the watchdog and is viewable at Reports -> Recent log messages.

The Xcode-generated implementation logs the error and aborts the application, which is a decidedly unfriendly approach. All users see when this happens is your application abruptly disappearing, without any clue to why. Causing this to happen in a shipping application garners poor reviews and low sales. Happily, however, you don t have to fall into this trap of logging and crashing. In this section, we explore strategies for handling errors in Core Data. No one strategy is the best, but this section should spark ideas for your specific applications and audiences and help you devise an error-handling strategy that makes sense. We can divide errors in Core Data into two major categories: Errors in normal Core Data operations Validation errors We discuss strategies for handling both types of errors, in turn.

As you ve seen in the XML-RPC client examples, Drupal does most of the heavy lifting for you. Let s go through a simple server example. You need to do three things to set up your server: 1. 2. 3. Define the function you want to execute when a client request arrives. Map that function to a public method name. Optionally define a method signature.

Note The p in preg_replace() signifies the use of PCRE. PHP also has ereg_replace(), which uses the

As usual with Drupal, you want to keep your code separate from the core system and just plug it in as a module. So here s a brief module that says hello via XML-RPC. Create the sites/all/modules/ custom/remotehello/remotehello.info file: name = Remote Hello description = Greets XML-RPC clients by name. package = Pro Drupal Development core = 7.x Here s remotehello.module: < php /** * Implements hook_xmlrpc(). * Map external names of XML-RPC methods to PHP callback functions. */

All the examples in this book respond to any Core Data errors using the default, Xcodegenerated error-handling code, dutifully outputting the error message to Xcode s console and aborting the application. This approach has two advantages:

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