iOS development--network programming OC & Data Request Summary

Last Update:2015-06-04 Source: Internet

Author: User

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Data Request Summary<pre>1 //**************************************get2 //Sync3 /*4 //first step, Create URL5 nsurl * url = [[nsurl alloc]initwithstring:@]http://e.hiphotos.baidu.com/image/w%3D1366%3Bcrop%3D0%2C0%2C1366%2C768/sign= 66f9b9980ef431adbcd2473a7d0097cc/08f790529822720ed8bdbef079cb0a46f21fab4d.jpg"];6 //second step, Create request requests via URL7 nsurlrequest * request = [[nsurlrequest Alloc]initwithurl:url cachepolicy: Nsurlrequestreloadignoringlocalcachedata timeoutinterval:15];8 //nsurlrequest Initialization method first Parameter: request Access path, second Parameter: cache protocol, Third Parameter: network request time-out (seconds)9 Ten //where The cache protocol is an enumeration type that contains: one // a //nsurlrequestuseprotocolcachepolicy (basic Strategy) - // - ///nsurlrequestreloadignoringlocalcachedata (ignoring Local cache) the // - //nsurlrequestreturncachedataelseload (first Use cache, if there is no local cache, download from the original Address) - // - //nsurlrequestreturncachedatadontload (use Local cache, never download, if there is no cache locally, the request fails, This policy is used for offline Operation) + // - //nsurlrequestreloadignoringlocalandremotecachedata (ignoring Any caching policies, whether local or remote, always re-downloaded from the original Address) + // a //nsurlrequestreloadrevalidatingcachedata (if The local cache is valid, do not download, and any other cases are re-downloaded from the original Address) at //third step, connect to server - nsurlresponse * respones = nil; - nserror * error = nil; - NSData * reviced = [nsurlconnection sendsynchronousrequest:request returningresponse:&respones error:& error]; - //fourth step, convert data into pictures - UIImage * image = [[UIImage alloc]initwithdata:reviced]; in _imageview.image = image; - */ to + //Asynchronous - /** the //first step, Create URL * nsurl * url = [[nsurl alloc]initwithstring:@]http://e.hiphotos.baidu.com/image/w%3D1366%3Bcrop%3D0%2C0%2C1366%2C768/sign= 66f9b9980ef431adbcd2473a7d0097cc/08f790529822720ed8bdbef079cb0a46f21fab4d.jpg"]; $ //second step, Create request requests via URLPanax Notoginseng nsurlrequest * request = [[nsurlrequest Alloc]initwithurl:url cachepolicy: Nsurlrequestreloadignoringlocalcachedata timeoutinterval:15]; - //third step, connect to server the [nsurlconnection connectionwithrequest:request delegate:self];//(requires proxy method specified in. h) + //receive A response call to the server a -(void) connection: (nsurlconnection *) connection didreceiveresponse: (nsurlresponse *) response the { + [self.revicedata setlength:0]; - $ } $ //data transfer is always called - -(void) connection: (nsurlconnection *) connection didreceivedata: (nsdata *) data - { the [self.revicedata appenddata:data]; - Wuyi } the ///data is not called until it is finished - -(void) connectiondidfinishloading: (nsurlconnection *) Connection wu { - UIImage * image = [[UIImage alloc]initwithdata:self.revicedata]; about _imageview.image = image; $ - } - */ - a + //**************************************post the //Sync - /** $ //first step, Create URL the nsurl * url = [[nsurl alloc]initwithstring:@]http://api.hudong.com/iphonexml.do"]; the ///second step, Create a mutable requests request via URL (only A variable request is created to set up post Requests) the nsmutableurlrequest * request1 = [[nsmutableurlrequest Alloc]initwithurl:url cachepolicy: Nsurlrequestreloadignoringcachedata timeoutinterval:100]; the the Maximum time for the//timeoutinterval:post timeout is 240 seconds, and it is useless to set the number of seconds in the Method. - in //step three, Set the POST request mode the [request1 sethttpmethod:@ "POST"]; the //fourth step, Setting Parameters about NSString * bodystr = @ "type=focus-c"; the NSData * BODY = [bodystr datausingencoding:nsutf8stringencoding]; the [request1 sethttpbody:body]; the //fifth step, Connect Server + NSData * data = [nsurlconnection sendsynchronousrequest:request1 returningresponse:nil error:nil]; - NSString * str = [[nsstring Alloc]initwithdata:data encoding:nsutf8stringencoding]; the NSLog (@ "%@", str);Bayi */ the the - //Asynchronous - /** the //first step, Create URL the nsurl * url = [[nsurl alloc]initwithstring:@]http://api.hudong.com/iphonexml.do"]; the ///second step, Create a mutable requests request via URL (only A variable request is created to set up post Requests) the nsmutableurlrequest * request1 = [[nsmutableurlrequest Alloc]initwithurl:url cachepolicy: Nsurlrequestreloadignoringcachedata timeoutinterval:100]; - the Maximum time for the//timeoutinterval:post timeout is 240 seconds, and it is useless to set the number of seconds in the Method. the the //step three, Set the POST request mode the [request1 sethttpmethod:@ "POST"];94 //fourth step, Setting Parameters the NSString * bodystr = @ "type=focus-c"; the NSData * BODY = [bodystr datausingencoding:nsutf8stringencoding]; the [request1 sethttpbody:body];98 //fifth step, Connect Server about [[nsurlconnection alloc]initwithrequest:request2 delegate:self] - 101 //receive A response call to the server102 -(void) connection: (nsurlconnection *) connection didreceiveresponse: (nsurlresponse *) response103 {104 [self.revicedata setlength:0]; the 106 }107 //data transfer is always called108 -(void) connection: (nsurlconnection *) connection didreceivedata: (nsdata *) data109 { the [self.revicedata appenddata:data];111 the }113 ///data is not called until it is finished the -(void) connectiondidfinishloading: (nsurlconnection *) Connection the { the NSString * str = [[nsstring Alloc]initwithdata:self.revicedata encoding:nsutf8stringencoding];117 NSLog (@ "%@", str);118 }119 */ - 121 122 //Delegate Method123 /*124 typically four delegate methods are used: the 126 //received to respone, which contains the HTTP request status code and data header information, including data length, encoding format, etc.127 -(void) connection: (nsurlconnection *) connection didreceiveresponse: (nsurlresponse *) response{NSLog (@ "response =%@ ", response); _backdata = [[nsmutabledata alloc]init]; - }129 the //when Data is received, the complete data may be split into multiple packages to be sent, each time it is called by the data fragment, so a global NSData object is needed to stitch each piece of data together131 -(void) connection: (nsurlconnection *) connection didreceivedata: (nsdata *) data{ the [_backdata appenddata:data];133 }134 135 ////data Acceptance at the end of the call this method, when the data is the complete data obtained, you can use the data to do after the processing136 -(void) connectiondidfinishloading: (nsurlconnection *) connection{137 NSLog (@ "%@", [[nsstring alloc]initwithdata:_backdata encoding:nsutf8stringencoding]);138 }139 $ //this is a request error is called, error handling cannot be ignored141 -(void) connection: (nsurlconnection *) connection didfailwitherror: (nserror *) error{142 if (error.code = = Nsurlerrortimedout) {143 NSLog (@ "request timed out");144 }145 NSLog (@ "%@", [error localizeddescription]);146 }147 148 */</pre> iOS development--network programming OC & Data Request Summary

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