2014.12.3 Network Application

NSData

Foundation

Nsurl/nsurlrequest/nsurlconeection

Nsnetservice/nsnetservicebrowser

Core Foundation

Cfnetwork

Cfnetservice

BSD Sockets

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(1) Get pictures

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1. NSData *data = [[NSData alloc] initwithcontentsofurl:url];
2. NSData *data = [NSData Datawithcontentsofurl:url];

    NSData *data = [[NSData alloc] initwithcontentsofurl:url];    NSData *data = [NSData Datawithcontentsofurl:url];

Example:

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1.  nsautoreleasepool   *pool = [[nsautoreleasepool alloc]  init];  
2. //Based on network data, get to Image resource   
3. nsdata  *data  = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:self.picUrlString]];   
4. uiimage *image = [[uiimage alloc] initwithdata:data];   
5. [DATA RELEASE];  
6. //Return to main thread, display picture information   
7. [self performselectoronmainthread: @selector (displayimage:)  withObject:image  waituntildone:no];  
8. [image release];  
9.   
10. [pool release];  

     NSAutoreleasePool   *pool = [[NSAutoreleasePool alloc] init];    Based on network data, get to Image resource    nsdata  *data = [[NSData alloc] Initwithcontentsofurl:[nsurl urlwithstring: Self.picurlstring]];    UIImage *image = [[UIImage alloc] initwithdata:data];    [Data release];    Back to the main thread, display the picture information    [self performselectoronmainthread: @selector (displayimage:) withobject:image Waituntildone:no];    [Image release];    [Pool release];

Asynchronous

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1. Nsurlrequest *urlrequest = [Nsmutableurlrequest Requestwithurl:url];
2. Nsurlconnection *urlconnection = [[Nsurlconnection alloc] initwithrequest:urlrequest delegate:self];

Nsurlrequest *urlrequest = [Nsmutableurlrequest Requestwithurl:url]; Nsurlconnection *urlconnection = [[Nsurlconnection alloc] initwithrequest:urlrequest delegate:self];

(2)get method

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1. NSURL *URL = [NSURL URLWITHSTRING:URLSTRING];  
2. nsmutableurlrequest *therequest = [nsmutableurlrequest requestwithurl:url];  
3. nshttpurlresponse *response = [[nshttpurlresponse alloc] init];   
4. nsdata *retdata = [nsurlconnection sendsynchronousrequest:therequest    
5. RETURNINGRESPONSE:&RESPONSE ERROR:NIL];  
6. Nsstring *retstring = [[nsstring alloc] initwithdata:retdata encoding: nsutf8stringencoding];  

Nsurl *url = [Nsurl urlwithstring:urlstring]; Nsmutableurlrequest *therequest = [Nsmutableurlrequest Requestwithurl:url]; Nshttpurlresponse *response = [[Nshttpurlresponse alloc] init]; NSData *retdata = [nsurlconnection sendsynchronousrequest:therequest returningresponse:&response Error:nil]; NSString *retstring = [[NSString alloc] Initwithdata:retdata encoding:nsutf8stringencoding];

(3) Post method

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2. Nsurl *url = [Nsurl urlwithstring:urlstring];
4. Nsmutableurlrequest *therequest = [Nsmutableurlrequest Requestwithurl:url];
6. NSString *poststring = @ "test=3";
8. NSData *postdata = [poststring datausingencoding:nsutf8stringencoding];
10. NSString *msglength = [NSString stringwithformat:@ "%d", [postdata length]];
12. [Therequest addvalue:msglength forhttpheaderfield:@ "Content-length"];
14. [Therequest sethttpmethod:@ "POST"];
16. [Therequest Sethttpbody:postdata];
18. Nshttpurlresponse *response =[[nshttpurlresponse alloc] init];
20. NSData *retdata = [nsurlconnection sendsynchronousrquest:therequest returningresponse:&response Error:nil];

2014.12.3 Network Application