IOS study notes (8)-iOS network communication http-NSURLConnection

 

1)

 

- (void)httpAsynchronousRequest{    NSURL *url = [NSURL URLWithString:@"http://url"];        NSString *post=@"postData";        NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];    [request setHTTPMethod:@"POST"];    [request setHTTPBody:postData];    [request setTimeoutInterval:10.0];        NSOperationQueue *queue = [[NSOperationQueue alloc]init];    [NSURLConnection sendAsynchronousRequest:request                                       queue:queue                           completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){                               if (error) {                                   NSLog(@"Httperror:%@%d", error.localizedDescription,error.code);                               }else{                                                                      NSInteger responseCode = [(NSHTTPURLResponse *)response statusCode];                                                                      NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];                                                                      NSLog(@"HttpResponseCode:%d", responseCode);                                   NSLog(@"HttpResponseBody %@",responseString);                               }                           }];    }

2)

 

- (void)httpConnectionWithRequest{        NSString *URLPath = [NSString stringWithFormat:@"http://url"];    NSURL *URL = [NSURL URLWithString:URLPath];    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:URL];    [NSURLConnection connectionWithRequest:request delegate:self];    }- (void)connection:(NSURLConnection *)theConnection didReceiveResponse:(NSURLResponse *)response{       NSInteger responseCode = [(NSHTTPURLResponse *)response statusCode];    NSLog(@"response length=%lld  statecode%d", [response expectedContentLength],responseCode);}// A delegate method called by the NSURLConnection as data arrives.  The// response data for a POST is only for useful for debugging purposes,// so we just drop it on the floor.- (void)connection:(NSURLConnection *)theConnection didReceiveData:(NSData *)data{    if (mData == nil) {        mData = [[NSMutableData alloc] initWithData:data];    } else {        [mData appendData:data];    }    NSLog(@"response connection");}// A delegate method called by the NSURLConnection if the connection fails.// We shut down the connection and display the failure.  Production quality code// would either display or log the actual error.- (void)connection:(NSURLConnection *)theConnection didFailWithError:(NSError *)error{        NSLog(@"response error%@", [error localizedFailureReason]);}// A delegate method called by the NSURLConnection when the connection has been// done successfully.  We shut down the connection with a nil status, which// causes the image to be displayed.- (void)connectionDidFinishLoading:(NSURLConnection *)theConnection{    NSString *responseString = [[NSString alloc] initWithData:mData encoding:NSUTF8StringEncoding];     NSLog(@"response body%@", responseString);}

 

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;

2. Connection Failed, including failure.

 

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;

 

3. receive data

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;

4. Data reception is complete

-(Void) connectionDidFinishLoading :( NSURLConnection *) connection;

 

 

AEURLConnection is a simple reimplementation of the API for use on iOS 4. Used properly, it is also guaranteed to be safe against The Deallocation Problem, a thorny threading issue that affects most other networking libraries.

 

 

 

-(Void) httpSynchronousRequest {NSURLRequest * urlRequest = [NSURLRequest requestWithURL: [NSURL URLWithString: @ "http://google.com"]; NSURLResponse * response = nil; NSError * error = nil; NSData * data = [NSURLConnection sendSynchronousRequest: urlRequest returningResponse: & response error: & error]; if (error = nil) {// process data }}

 

 

 

@ Zhang xingye TBOW