Ios NSURLRequest NSMutableURLRequest Data Request

Ios NSURLRequest NSMutableURLRequest Data Request

Get request

# Pragma mark-GET login-(void) getLogon {// 1. URL NSString * urlStr = [NSString stringWithFormat: @ "http: // localhost/login. php? Username = % @ & password = % @ ", self. userName. text, self. userPwd. text]; NSURL * url = [NSURL URLWithString: urlStr]; // 2. request NSURLRequest * request = [NSURLRequest requestWithURL: url]; // 3. connection // 1> before the logon is complete, no subsequent work can be done! // 2> the logon is in progress. You can do something better! // 3> If the login operation is performed in other threads, the main thread's work will not be blocked. // 4> conclusion: the login operation is asynchronous, and the [NSURLConnection sendAsynchronousRequest: request queue: [[NSOperationQueue alloc] init] completionHandler: ^ (NSURLResponse * response, NSData * data, NSError * connectionError) {if (connectionError = nil) {// run the command after the network request is completed! // Convert Data to the string NSString * str = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding]; // num = 2 NSLog (@ "% @", str, [NSThread currentThread]); // update the interface [[NSOperationQueue mainQueue] addOperationWithBlock: ^ {self. logonResult. text = @ "Logon completed";}] ;}}]; // num = 1 NSLog (@ "come here % @", [NSThread currentThread]); NSURLResponse * response = nil; // 1. does & response really understand it? // 2. error: Why is it NULL, instead of nil // NULL is in C Language = 0 // in C language, it is not dangerous to point the pointer address to 0 // nil is OC, is an empty object to send messages without issues // [response MIMEType]; [NSURLConnection sendSynchronousRequest: request returningResponse: & response error: NULL];}

Post request

# Pragma mark-POST logon-(void) postLogon {// 1. url nsurl * url = [NSURL URLWithString: @ "http: // localhost/login. php "]; // 2. request (a request that can be modified) NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL: url]; //? POST // The default value is GET request. HTTPMethod = @ "POST ";//? Data body NSString * str = [NSString stringWithFormat: @ "username =%@ & password =%@", self. userName. text, self. userPwd. text]; // converts a string to a data request. HTTPBody = [str dataUsingEncoding: NSUTF8StringEncoding]; // 3. connection, asynchronous [NSURLConnection sendAsynchronousRequest: request queue: [[NSOperationQueue alloc] init] completionHandler: ^ (NSURLResponse * response, NSData * data, NSError * connectionError) {if (connectionError = = Nil) {// run the command after the network request is completed! // Convert Data to the string NSString * str = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding]; // num = 2 NSLog (@ "% @", str, [NSThread currentThread]); // update the interface [[NSOperationQueue mainQueue] addOperationWithBlock: ^ {self. logonResult. text = str ;}] ;}}]; // num = 1 NSLog (@ "come here % @", [NSThread currentThread]);}

There are two ways to use NSURLConnection: the first is as above, and the second is to implement NSURLConnectionDataDelegate proxy.

-(Void) getLogon {// 1. URL NSString * urlStr = [NSString stringWithFormat: @ "http: // localhost/login. php? Username = % @ & password = % @ ", self. userName. text, self. myPwd]; NSLog (@ "% @", self. myPwd); NSURL * url = [NSURL URLWithString: urlStr]; // 2. request NSURLRequest * request = [NSURLRequest requestWithURL: url]; // 3. connection, over 10 years old // is a very old technology NSURLConnection * connection = [NSURLConnection connectionWithRequest: request delegate: self]; // starts to work in many multithreading technologies, start run dispatch_async (dispatch_queue_create ("demo", DISP ATCH_QUEUE_CONCURRENT), ^ {[connection start];}) ;}# pragma mark-NSURLConnectionDataDelegate proxy method # pragma mark receives the response-(void) connection :( NSURLConnection *) connection didReceiveResponse :( NSURLResponse *) response {// preparation work // click the button to have a network request. To avoid repeated open space if (! Self. data) {self. data = [NSMutableData data];} else {[self. data setData: nil] ;}# pragma mark receives data. If the data volume is large, such as a video, it is called multiple times-(void) connection :( NSURLConnection *) connection didReceiveData :( NSData *) data {// concatenate the data. The position of the binary stream [self. data appendData: data] ;}# The pragma mark is successfully received and processed.-(void) connectionDidFinishLoading :( NSURLConnection *) connection {// final processing NSString * str = [[NSString alloc] initWithData: self. data encoding: NSUTF8StringEncoding]; NSLog (@ "% @", str, [NSThread currentThread]);} # pragma mark error handling, the possibility of network errors is very high-(void) connection :( NSURLConnection *) connection didFailWithError :( NSError *) error {NSLog (@ "% @", error. localizedDescription );}

Note: UI updates must be performed on the main thread to ensure thread security.

// Update the interface [[NSOperationQueue mainQueue] addOperationWithBlock: ^ {self. logonResult. text = str;}];