Network Programming NSURLConnection and iosnsurlconnection for Ios

Network Programming NSURLConnection and iosnsurlconnection for Ios

NSURLConnection is primarily used for network access through four categories: NSURL, NSURLRequest, NSMutableURLRequest, NSURLConnection

　　I. Basic Knowledge

(1) NSURL: request address
(2) NSURLRequest: encapsulates a request and stores all the data sent to the server, including an NSURL object, request method, request header, and request body ....
(3) NSMutableURLRequest: NSURLRequest subclass
(4) NSURLConnection: responsible for sending requests and establishing connections between the client and the server. Send NSURLRequest data to the server and collect response data from the server

　　Ii. function implementation

　　1./******** get method *******/

// Global variable, receiving data NSMutableData * requestData; NSURL * url = [NSURL URLWithString: @ "http: // 192.168.20.2/logo. php? UserName = jereh & pwd = 123 "]; // create a request NSURLRequest * request = [NSURLRequest requestWithURL: URL] through url; // connect to the server through NSURLConnection, and send the request NSURLConnection * connection = [NSURLConnection connectionWithRequest: request delegate: self]; [connection start]; // receives the request-(void) connection :( NSURLConnection *) connection didReceiveResponse :( NSURLResponse *) response {NSLog (@ "didReceiveResponse"); // initialize datarequestData = [NSMutableData data] In this method;} // receive data-(void) connection :( NSURLConnection *) connection didReceiveData :( NSData *) data {// prevent the file from being too large. append [requestData appendData: data] multiple times;} // The data is received-(void) connectionDidFinishLoading :( NSURLConnection *) connection {NSDictionary * dic = [NSJSONSerialization JSONObjectWithData: requestData options: Unknown error: nil]; NSLog (@ "% @", dic );} // transmission failed-(void) connection :( NSURLConnection *) connection didFailWithError :( NSError *) error {NSLog (@ "didFailWithError ");}

2./******* post method *******/

NSURL * url = [NSURL URLWithString: @ "http: // 192.168.20.2/loginPost. php "]; // defines the variable request NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL: url]; // sets the request Method request. HTTPMethod = @ "POST"; // you can specify the request parameter. HTTPBody = [@ "userName = jereh & pwd = 123" dataUsingEncoding: NSUTF8StringEncoding]; NSURLConnection * con = [NSURLConnection connectionWithRequest: request delegate: self]; [con start];

3. Non-proxy method

// Synchronize NSURLResponse * response; NSData * data = [NSURLConnection sendSynchronousRequest: request returningResponse: & response error: nil]; // asynchronous [NSURLConnection sendAsynchronousRequest: request queue: [NSOperationQueue mainQueue] completionHandler: ^ (NSURLResponse * response, NSData * data, NSError * connectionError) {// main thread operation}];

 

Author: Jerry Education
Source: http://www.cnblogs.com/jerehedu/
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