錯誤在iPhone應用程序解析JSON的URL

Question

我是新國展局在iPhone application.I要實現JSON parsing.I已經嘗試了設在net.But，樣品不能找出如何得到確切的方法在做json解析的時候url的索引值。任何人都可以在早期完成。作爲初學者，任何人都可以引導我。

提前 iPhone開發

Answer 1

等待的積極響應

感謝您的觀點didload

NSURLRequest *request = [NSURLRequest requestWithURL: 
          [NSURL URLWithString:Str_URL]]; 
    // NSLog(@"\n\n\n request ===%@\n\n\n",request); 
    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:request delegate:self]; 
    if (theConnection) { 

     // Create the NSMutableData to hold the received data. 

     // receivedData is an instance variable declared elsewhere. 

     responseData = [[NSMutableData data] init]; 

    } else { 

     // Inform the user that the connection failed. 

    } 




#pragma mark NSURLConnection Delegate methods 
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 
    //NSLog(@"\n\n\n response ===%@\n\n\n",response); 
    [responseData setLength:0]; 
} 

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 
    //NSLog(@"\n\n\n data ===%@\n\n\n",data); 
    [responseData appendData:data]; 
} 

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { 
    NSString *strerror = [NSString stringWithFormat:@"Connection failed: %@", [error description]]; 
    NSLog(@"\n\n\n error ===%@\n\n\n",strerror); 

} 

- (void)connectionDidFinishLoading:(NSURLConnection *)connection { 

    //NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; 

    if(responseData != nil) 
    { 
     NSError *error = nil; 
     id result = [NSJSONSerialization JSONObjectWithData:responseData options:NSJSONReadingMutableContainers error:&error]; 
     } 

} 

Answer 2

試試這個

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 
{ 
    [responseData setLength: 0]; 
} 
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data 
{ 
    [responseData appendData:data]; 
} 

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error 
{ 
    NSLog(@"ERROR with theConenction"); 
    [connection release]; 
    responseData = nil; 
} 

-(void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    [connection release]; 
    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding]; 
    responseData = nil; 
    NSLog(@"response String= %@",responseString); 

    SBJSON *parser = [[SBJSON alloc] init]; 
    NSDictionary *data = (NSDictionary *) [parser objectWithString:responseString error:nil]; 

    NSDictionary *menu = (NSDictionary *) [data objectForKey:@"MainTag"]; 
    NSString *com=(NSString *) [menu objectForKey:@"yourSubTag"]; 
}