ASIHTTPRequest和ASINetworkQueue和JSON解析

Question

// 
// RootViewController.m 
// JsonPetser33 
// 
// Created by ME on 9/26/11. 
// Copyright 2011 __MyCompanyName__. All rights reserved. 
// 

#import "RootViewController.h" 
// 
#import "SBJson.h" 
#import "ASIHTTPRequest.h" 
#import "ASINetworkQueue.h" 
// 
@implementation RootViewController 
// 
@synthesize mNetworkQueue; 
@synthesize mArrData; 
// 
- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    //adding right button 
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] 
               initWithTitle:@"Load" 
               style:UIBarButtonItemStyleDone 
               target:self 
               action:@selector(loadData)]; 
} 

-(void) loadData{ 
    //Stop anything already in the queue before removing it 
    [[self mNetworkQueue] cancelAllOperations]; 
    //Creating a new queue each time we use it means we don't have to worry about clearing delegates or resetting progress tracking 
    [self setMNetworkQueue:[ASINetworkQueue queue]]; 
    [[self mNetworkQueue] setDelegate:self]; 
    [[self mNetworkQueue] setRequestDidFinishSelector:@selector(requestFinished:)]; 
    [[self mNetworkQueue] setRequestDidFailSelector:@selector(requestFailed:)]; 
    [[self mNetworkQueue] setQueueDidFinishSelector:@selector(queueFinished:)]; 

    //create url request using ASIHTTPRequest 
    ASIHTTPRequest *request; 
    request = [ASIHTTPRequest requestWithURL:[NSURL 
               URLWithString:@"http://mikan-box.x10.bz/testing/json_test.php"]]; 
    [[self mNetworkQueue] addOperation:request]; 

    [[self mNetworkQueue] go]; 
} 
//ASIHTTPRequest protocol? 
- (void) requestFinished: (ASIHTTPRequest *)request{ 
    //You could release the queue here if you wanted 
    if ([[self mNetworkQueue] requestsCount] == 0) { 

     //Since this is a retained property, setting it to nil will release it 
     //This is the safest way to handle releasing things - most of the time you only ever need to release in your accessors 
     //And if you an Objective-C 2.0 property for the queue (as in this example) the accessor is generated for you 
     [self setMNetworkQueue:nil]; 
    } 
    //... Handle success 
    //parsing the data 
    SBJsonParser *jsonParser = [SBJsonParser new]; 
    NSDictionary *dicTemp = [jsonParser objectWithData:[request responseData]];//parse json 
    mArrData = [dicTemp objectForKey:@"markers"]; 
//do something like loading data in table for now NSLog data 
NSLog(@"markers: %@",mArrData);    //here the app freezes can't click button etc for a few seconds// 
    NSLog(@"count %d",[mArrData count]);  // how can i enhance it? 
    [jsonParser release]; 



    NSLog(@"Request finished"); 
} 
- (void) requestFailed:(ASIHTTPRequest *)request{ 
    //You could release the queue here if you wanted 
    if ([[self mNetworkQueue] requestsCount] == 0) { 
     [self setMNetworkQueue:nil]; 
    } 
    //... Handle failure 
    NSLog(@"Request failed: %@",[[request error] localizedDescription]); 
} 

-(void) queueFinished:(ASIHTTPRequest *) queue{ 
    //You could release the queue here if you wanted 
    if ([[self mNetworkQueue] requestsCount] == 0) { 
     [self setMNetworkQueue:nil]; 
    } 
    NSLog(@"Queue finished"); 
} 
// 


- (void)didReceiveMemoryWarning 
{ 
    // Releases the view if it doesn't have a superview. 
    [super didReceiveMemoryWarning]; 

    // Relinquish ownership any cached data, images, etc that aren't in use. 
} 

- (void)viewDidUnload 
{ 
    [super viewDidUnload]; 

    // Relinquish ownership of anything that can be recreated in viewDidLoad or on demand. 
    // For example: self.myOutlet = nil; 
} 

- (void)dealloc 
{ 
    [mNetworkQueue reset]; 
    [mNetworkQueue release]; 
    [super dealloc]; 
} 

@end 

• 進出口新的Objective-C和到iOS ..我用ASIHTTPRequest，因爲它已經有一個HttpHandler的..
• 的問題是，當我從做HTTP請求URL給（其JSON）它解凍和顯示「NSLog（@」標記：％@「，mArrData）」時凍結「..有沒有辦法改善這種代碼？
• 我想改善喜歡做它在URL請求做了另一個線程就像ASINetworkQueue
• 我聽說GCD（大中央調度）這個代碼，但不知道它是如何或者即使是有用的..
• thanx提前

Answer 1

您是否嘗試過不使用ASINetworkQueue，只是用一個簡單的ASIHTTPRequest和使用startAsynchronous？例如：

NSURL *url = [NSURL URLWithString:@"http://mikan-box.x10.bz/testing/json_test.php"]; 
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; 
[request setDelegate:self]; 
[request startAsynchronous]; 

如果你有多個請求，您可以使用[request setTag:tag]來區分他們requestFinished:。