xcode에서 비동기적으로 웹 서비스를 호출하여 빅데이터를 얻는 처리 방식

        // 
        NSURLConnection *theConnection = [[[NSURLConnection alloc] initWithRequest:urlRequest delegate:self] autorelease];
        if (theConnection) {   
            // Create the NSMutableData that will hold 
            // the received data 
            // receivedData is declared as a method instance elsewhere 
            self.receivedData=[[NSMutableData data] retain];   
        } else {   
            
        }   

// ， 
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    DLog(@"ERROR with theConenction:%@",error );
 
}

// 
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    // store data
    DLog(@"didReceiveResponse");
    [self.receivedData setLength:0  ];            // 
}

// ( )， soap 
-(void) connection:(NSURLConnection *) connection didReceiveData:(NSData *)responseData
{
    DLog(@"（ ， ） responseData  :%@",[[[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding] autorelease]);
    [self.receivedData appendData:responseData];    
}

- (void) connectionDidFinishLoading:(NSURLConnection *) connection
{
    DLog(@"%d",[self.receivedData length]);
    NSString * wsReturnValueString = [[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding];
    DLog(@"webserivce  ，   :%@",wsReturnValueString );
    DLog(@"WebService ");
}