Web Services with Objective-C
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Web services allow programs and websites to interact using common web technologies like HTTP and XML. There are two main styles - service oriented architectures which use technologies like SOAP and resource oriented architectures which use REST principles. REST uses simple HTTP requests to GET, POST, PUT and DELETE resources identified by URIs. Consuming a RESTful service involves finding out the API details, making HTTP requests to the service, and parsing the response which is often XML or JSON.
![[email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-1-320.jpg)
![Hot New Technology World Wide Web – WWW Web 3.0 Rise of the Machines!!! [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-2-320.jpg)
![Web services Web services – Websites for programs [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-3-320.jpg)
![Common Web Services Flickr Amazon Twitter Youtube Ebay Google search, maps, etc. Meetup Thousands of others [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-4-320.jpg)
![2 basic styles of services Service Oriented Architectures – (Distributed Objects) CORBA, SOAP, XML-RPC, COM Resource Oriented Architectures Resources can be anything REST – use simple web based technologies HTTP URI XML (or Json, xhtml, text, plists, etc.) [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-5-320.jpg)
![HTTP Methods: GET, POST, PUT, DELETE, HEAD Parameters in URL or Body Return codes: 200, 404, 500, etc. Headers: Cache, Authentication, etc. [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-6-320.jpg)
![URI / URL Addressability Connectedness Uniformity Hierarchical [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-7-320.jpg)
![Content Format up to the designer XML JSON – especially for AJAX XHTML Can support multiple formats [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-8-320.jpg)
![Steps for using a RESTful service Gather information - URI, Method, Params Make HTTP Request Parse Result [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-9-320.jpg)
![1) Gather information Study the API http://www.meetup.com/meetup_api/docs/ Decide what you want to do: Ie. Get a list of meetups near me. http://api.meetup.com/events.xml/?lat=40.743348&lon=-73.993525&radius=1&key=123 [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-10-320.jpg)
![Result (part 1) <results> <head> <count>200</count> <total_count>1274</total_count> <updated>Mon Aug 25 20:10:21 EDT 2008</updated> <description>API method for accessing meetup events</description> <lat>40.743348</lat> <id/> <method>Events</method> <lon>-73.993525</lon> <title>Meetup Events</title> <next> http://api.meetup.com/events/ ?... </next> <link>http://api.meetup.com/events/</link> <url> http://api.meetup.com/events/ ? … </url> </head> [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-11-320.jpg)
![Result (part 2) <items> <item> <lon>-73.98999786376953</lon> <rsvpcount>3</rsvpcount> <group_name>Better Laugh Laughter Yoga</group_name> <lat>40.7400016784668</lat> <feecurrency>USD</feecurrency> <time>Mon Aug 25 19:30:00 EDT 2008</time> <event_url>http://stress.meetup.com/12/calendar/8385325</event_url> <attendee_count>0</attendee_count> <id>8385325</id> <venue_lon/> <fee>0.0</fee> <venue_name/> <venue_lat/> <description/> <photo_url> http://photos1.meetupstatic.com/photos/event/1/6/4/b/global_3743707.jpeg </photo_url> <updated>Mon Jul 21 20:35:17 EDT 2008</updated> <feedesc/> <questions/> <name>Better Laugh Laughter Yoga Meetup</name> </item> [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-12-320.jpg)
![2) Make HTTP Request Encode parameters URL or body Specify method Manipulate headers Example: Simple GET in your browser or use curl curl "http://api.meetup.com/groups/?zip=10003&key=123” [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-13-320.jpg)
![Simplest way in Objective-C NSString *urlString = @"http://api.meetup.com/…”; NSURL *url = [NSURL URLWithString:urlString]; NSStringEncoding encoding; NSError *error; NSString *doc = [NSString stringWithContentsOfURL:url usedEncoding:&encoding error:&error]; [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-14-320.jpg)
![More control NSURLResponse *response; NSError *error; NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url]; // Manipulate the request NSData *urlData = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:&error]; [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-15-320.jpg)
![Asynchronous way NSURLConnection *connection = [NSURLConnection connectionWithRequest:urlRequest delegate:self]; // start ‘progress’ animation -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [myData appendData:data]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { // stop ‘progress’ animation and use data. } [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-16-320.jpg)
![Homework Extract this all out into a reusable web services client class that Sets parameters and body based on HTTP method Makes asynchronous calls and collects data Calls back arbitrary methods on delegate Load images asynchronously also Hints: SEL/performSelector, also check out twitter engine [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-17-320.jpg)
![3) Parse Results NSXMLParser - SAX based parsing NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data]; [parser setDelegate:self]; [parser parse]; parser: didStartElement: namespaceURI: qualifiedName: attributes: parser: didEndElement: namespaceURI: qualifiedName: parser: foundCharacters: [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-18-320.jpg)
![Other Options Libxml2 http://code.google.com/p/touchcode/wiki/TouchXML http://code.google.com/p/touchcode/wiki/TouchJSON P Lists – NSPropertyListSerialization propertyListFromData [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-19-320.jpg)
![Things to look out for Bugs in client libraries - sometimes PUT and DELETE are not well supported Debugging the HTTP request response can be trying. Anyone know of a good debugging proxy? [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-20-320.jpg)
![Resources programmableweb.com Code besides twitter engine? For REST info check out: [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-21-320.jpg)
![Questions? Slides will be on http://www.E-String.com Feel free to contact me: Julio Barros 917-445-7264 [email_address] [email_address]](https://image.slidesharecdn.com/webserviceswithobjc-1220842172494119-9/85/Web-Services-with-Objective-C-22-320.jpg)
Web Services with Objective-C
- 2. Hot New Technology World Wide Web – WWW Web 3.0 Rise of the Machines!!! [email_address]
- 3. Web services Web services – Websites for programs [email_address]
- 4. Common Web Services Flickr Amazon Twitter Youtube Ebay Google search, maps, etc. Meetup Thousands of others [email_address]
- 5. 2 basic styles of services Service Oriented Architectures – (Distributed Objects) CORBA, SOAP, XML-RPC, COM Resource Oriented Architectures Resources can be anything REST – use simple web based technologies HTTP URI XML (or Json, xhtml, text, plists, etc.) [email_address]
- 6. HTTP Methods: GET, POST, PUT, DELETE, HEAD Parameters in URL or Body Return codes: 200, 404, 500, etc. Headers: Cache, Authentication, etc. [email_address]
- 7. URI / URL Addressability Connectedness Uniformity Hierarchical [email_address]
- 8. Content Format up to the designer XML JSON – especially for AJAX XHTML Can support multiple formats [email_address]
- 9. Steps for using a RESTful service Gather information - URI, Method, Params Make HTTP Request Parse Result [email_address]
- 10. 1) Gather information Study the API http://www.meetup.com/meetup_api/docs/ Decide what you want to do: Ie. Get a list of meetups near me. http://api.meetup.com/events.xml/?lat=40.743348&lon=-73.993525&radius=1&key=123 [email_address]
- 11. Result (part 1) <results> <head> <count>200</count> <total_count>1274</total_count> <updated>Mon Aug 25 20:10:21 EDT 2008</updated> <description>API method for accessing meetup events</description> <lat>40.743348</lat> <id/> <method>Events</method> <lon>-73.993525</lon> <title>Meetup Events</title> <next> http://api.meetup.com/events/ ?... </next> <link>http://api.meetup.com/events/</link> <url> http://api.meetup.com/events/ ? … </url> </head> [email_address]
- 12. Result (part 2) <items> <item> <lon>-73.98999786376953</lon> <rsvpcount>3</rsvpcount> <group_name>Better Laugh Laughter Yoga</group_name> <lat>40.7400016784668</lat> <feecurrency>USD</feecurrency> <time>Mon Aug 25 19:30:00 EDT 2008</time> <event_url>http://stress.meetup.com/12/calendar/8385325</event_url> <attendee_count>0</attendee_count> <id>8385325</id> <venue_lon/> <fee>0.0</fee> <venue_name/> <venue_lat/> <description/> <photo_url> http://photos1.meetupstatic.com/photos/event/1/6/4/b/global_3743707.jpeg </photo_url> <updated>Mon Jul 21 20:35:17 EDT 2008</updated> <feedesc/> <questions/> <name>Better Laugh Laughter Yoga Meetup</name> </item> [email_address]
- 13. 2) Make HTTP Request Encode parameters URL or body Specify method Manipulate headers Example: Simple GET in your browser or use curl curl "http://api.meetup.com/groups/?zip=10003&key=123” [email_address]
- 14. Simplest way in Objective-C NSString *urlString = @"http://api.meetup.com/…”; NSURL *url = [NSURL URLWithString:urlString]; NSStringEncoding encoding; NSError *error; NSString *doc = [NSString stringWithContentsOfURL:url usedEncoding:&encoding error:&error]; [email_address]
- 15. More control NSURLResponse *response; NSError *error; NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url]; // Manipulate the request NSData *urlData = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:&error]; [email_address]
- 16. Asynchronous way NSURLConnection *connection = [NSURLConnection connectionWithRequest:urlRequest delegate:self]; // start ‘progress’ animation -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [myData appendData:data]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { // stop ‘progress’ animation and use data. } [email_address]
- 17. Homework Extract this all out into a reusable web services client class that Sets parameters and body based on HTTP method Makes asynchronous calls and collects data Calls back arbitrary methods on delegate Load images asynchronously also Hints: SEL/performSelector, also check out twitter engine [email_address]
- 18. 3) Parse Results NSXMLParser - SAX based parsing NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data]; [parser setDelegate:self]; [parser parse]; parser: didStartElement: namespaceURI: qualifiedName: attributes: parser: didEndElement: namespaceURI: qualifiedName: parser: foundCharacters: [email_address]
- 19. Other Options Libxml2 http://code.google.com/p/touchcode/wiki/TouchXML http://code.google.com/p/touchcode/wiki/TouchJSON P Lists – NSPropertyListSerialization propertyListFromData [email_address]
- 20. Things to look out for Bugs in client libraries - sometimes PUT and DELETE are not well supported Debugging the HTTP request response can be trying. Anyone know of a good debugging proxy? [email_address]
- 21. Resources programmableweb.com Code besides twitter engine? For REST info check out: [email_address]
- 22. Questions? Slides will be on http://www.E-String.com Feel free to contact me: Julio Barros 917-445-7264 [email_address] [email_address]