HTTP synchronous requests and asynchronous requests for IOS programs

IOS ProgramOfHTTPSynchronizationRequestAnd asyncRequestThe solution to the problem is described in this article. There is not much content, mainly through code to achieve synchronous and asynchronousRequest, Let's take a look at the details.

Asynchronous request,

 
 

  
  
NSMutableData * buf = [[NSMutableData alloc] initWithLength: 0];
  
  
NSURLConnection * connection = [[NSURLConnection alloc] initWithRequest: req delegate: self];
  
  
// Triggered when the response is received
  
  
-(Void) connection :( NSURLConnection *) aConnection didReceiveResponse :( NSURLResponse *) aResponse;
  
  
// You can determine the returned result or process the information in the returned http header.
  
  
// Call each time data is received
  
  
-(Void) connection :( NSURLConnection *) aConn didReceiveData :( NSData *) data;
  
  
// Therefore, in general, yes
  
  
-(Void) connection :( NSURLConnection *) aConn didReceiveData :( NSData *) data
  
  
{
  
  
[Buf appendData: data];
  
  
}
  
  
// Of course, buffer is also stated in the previous initWithRequest.
  
  
// Triggered when a network error occurs
  
  
-(Void) connection :( NSURLConnection *) aConn didFailWithError :( NSError *) error;
  
  
// Triggered when all data is received
  
  
-(Void) connectionDidFinishLoading :( NSURLConnection *) aConn;
 
 

Synchronous request

 
 

  
  
// For initialization, please request NSMutableURLRequest * request = [[NSMutableURLRequest alloc] init];
  
  
// Set the URL
  
  
[Request setURL: [NSURL URLWithString: urlStr];
  
  
// Set the HTTP Method
  
  
[Request setHTTPMethod: @ "GET"];
  
  
// Sending and receiving synchronization request. Here, the returnData is the returned data records.
  
  
NSData * returnData = [NSURLConnection sendSynchronousRequest: request returningResponse: nil error: nil];
  
  
// Configure the object
  
  
[Request release];
 
 

Summary:IOS ProgramOfHTTPSynchronizationRequestAnd asyncRequestI hope this article will help you solve the problem!