ASIHttpRequest 使用理解

开源库：ASIHttpRequest

ASIHttpRequest 下载网址：http://github.com/pokeb/asi-http-request

依赖的5个库文件：CFNetwork, SystemConfiguration,MobileCoreServices,和libz , libxml2

//通过类方法来控制队列的执行个数，但是它一旦发送请求会被立刻执行，不能进行逻辑的控制

[ASIHTTPRequest sharedQueue].maxConcurrentOperationCount = 1;

//请求队列的初始化

// self.queue = [ASINetworkQueue queue];

//并发执行的个数

// self.queue.maxConcurrentOperationCount = 1;

//让队列执行下去,创建队列可以有我们控制他的执行逻辑顺序

//[self.queue go];

//发送异步请求

-(void)aSynchronous:(NSURL *)url

{

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

[request setRequestMethod:@"GET"];

[request setTimeOutSeconds:60];

//发送异步请求代理

// request.delegate = self;

//请求数据完成的时候调用Block

[request setCompletionBlock:^{

NSData *data = request.responseData;

UIImage  *image = [UIImage imageWithData:data];

self.image = image;

if (request.didUseCachedResponse) {

NSLog(@"来至于缓存");

}else {

NSLog(@"是来至网络");

}

}];

//请求数据失败调用Block

[request setFailedBlock:^{

NSLog(@"请求数据失败");

}];

//------------------------设置缓存策略-----------

NSString *cachePath = [NSHomeDirectory()stringByAppendingPathComponent:@"Documents"];

ASIDownloadCache *cache = [[ASIDownloadCache alloc] init];

[cache setStoragePath:cachePath];

cache.defaultCachePolicy =  ASIOnlyLoadIfNotCachedCachePolicy;

//这会在每一次绘画的时候清除上一次存储的

request.cacheStoragePolicy = ASICacheForSessionDurationCacheStoragePolicy;

//这里创建持久缓存，每次要调用时直接从内存中调用

//request.cacheStoragePolicy = ASICachePermanentlyCacheStoragePolicy;

// request.downloadCache = cache;

//开始异步请求

[request startAsynchronous];

//将请求添加到队列里

//通过句柄来设置获取实例对象

//    AppDelegate  *appDelegate = [UIApplication sharedApplication].delegate;

//    [appDelegate.queue addOperation:request];

}

//发送同步请求

-(void)synchronous:(NSURL *)url

{

//  ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];

[request setRequestMethod:@"GET"];

[request setTimeOutSeconds:60];

//设置请求头

//[request setRequestHeaders:<#(NSMutableDictionary *)#>];

//设置Cookier

//    [request setRequestCookies:<#(NSMutableArray *)#>];

//发送同步请求

[request startSynchronous];

//接收是否有错误信息

NSError *error = request.error;

if (error == nil) {

NSData *data = request.responseData;

UIImage *image = [UIImage imageWithData:data];

self.image = image;

}else{

NSLog(@"发送同步请求数据出错:%@",error);

}

}

#pragma mark ---aSynchronous delegate

//完成异步请求

- (void)requestFinished:(ASIHTTPRequest *)request

{

//获取数据

NSData *data = request.responseData;

UIImage *image = [UIImage imageWithData:data];

self.image = image;

}

//异步请求失败

- (void)requestFailed:(ASIHTTPRequest *)request

{

NSError *error = request.error;

NSLog(@"异步请求失败:%@",error);

}

其他方法: