Common methods in Network

1. Instantiate a Request object

Nsurl *url = [Nsurl urlwithstring:@ "Http://localhost/demo.json"];

Nsurlrequest *request = [Nsurlrequest Requestwithurl:url];

2. Sending the request

[Nsurlconnection sendasynchronousrequest:request queue:[nsoperationqueue Mainqueue] completionHandler:^ ( Nsurlresponse *response, NSData *data, Nserror *connectionerror) {

Response: Server response: Contains the data information (data format/data length) that gives us the response. When the file is downloaded, the response is used, mainly to get the file size.

Data: The server responds to us.

Connectionerror: Connection error.

if (Connectionerror | |!data) {

NSLog (@ "Connection error/PRO, your network is not good, please try to connect again");

return;

}else

{

<# (NSData *) #>:json data/

0. The most efficient when data is parsed

NULL Nil will not error

Parses the JSON data into OC data.

Nsdictionary *dict = [nsjsonserialization jsonobjectwithdata:data options:0 error:null];

NSLog (@ "%@", dict);

The ID can be used as a property name. No problem at all.

When receiving numbers, use NSNumber.

When parsing JSON data, use Nsjsonserialization.

Czweather *weather = [Czweather czweatherwithdict:dict];

NSLog (@ "%@,%@,%@", Weather.id,weather.message,weather.messageid);

String that gets binary data

NSString *str = [[NSString alloc] Initwithdata:data encoding:nsutf8stringencoding];

//

NSLog (@ "%@", str);

Common methods in Network