ASIHTTPRequest詳解http請求終結(jié)者

ASIHTTPRequestHTTP異步請求，隊列請求，GZIP壓縮，緩存，斷點(diǎn)續(xù)傳，進(jìn)度跟蹤，上傳文獻(xiàn)，HTTP認(rèn)證Objective-CBlockAPIHang住而不響應(yīng)任何顧客事件。因此，（下面會講到）-{NSURL*url=[NSURLASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requeststartSynchronous];NSError*error=[requesterror];if(!error){NSString*response=[request}}a,requestWithURLASIHTTPRequest的一種實(shí)例b,startSynchronous辦法啟動同時訪問，c,requesterror屬性獲取錯誤信息。d,responseStringNSString信息。-{NSURL*url=[NSURLASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requestsetDelegate:self];[request}-(void)requestFinished:(ASIHTTPRequest{//UsewhenfetchingtextNSString*responseString=[request//UsewhenfetchingbinaryNSData*responseData=[request}-(void)requestFailed:(ASIHTTPRequest{NSError*error=[request}a，與上面不同的地方是指定了一種"delegate"startAsynchronous來啟動網(wǎng)絡(luò)請求。bdelegaterequestFinished，請求失敗時（如網(wǎng)絡(luò)問題或服務(wù)器內(nèi)部錯誤）requestFailed。maxConcurrentOperationCount時，請求實(shí)例將被置為等待，直到前面最少有一種請求完畢并優(yōu)），maxConcurrentOperationCount設(shè)為“1”。-{if(![selfqueue])[selfsetQueue:[[[NSOperationQueuealloc]init]}NSURL*url=[NSURLASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requestsetDelegate:self];[requestsetDidFinishSelector:@selector(requestDone:)];[requestsetDidFailSelector:@selector(requestWentWrong:)];[[selfqueue]addOperation:request];//queueisan}-(void)requestDone:(ASIHTTPRequest{NSString*response=[request}-(void)requestWentWrong:(ASIHTTPRequest{NSError*error=[request}NSOperationQueueCocoa架構(gòu)的執(zhí)行任務(wù)（NSOperation）的任務(wù)隊列。我們通ASIHTTPRequest.hNSOperation的子類。也就是說它userInfobsetDidFinishSelectorsetDidFailSelector的回調(diào)辦法cASIHTTPRequestrequestFinished:與failWithProblem:辦法ASINetworkQueues,delegaterequestdeleaget。中其實(shí)并不能執(zhí)行請求，只有調(diào)用queuego]才會執(zhí)行；一種正在運(yùn)行中的隊列，并不需要重復(fù)調(diào)用[queuego]。默認(rèn)狀況下，隊列中的一種請求如果失敗，它會取消全部未完畢的請求。能夠設(shè)立queuesetShouldCancelAllRequestsOnFailure:NO]來修正。另一方面，不管是隊列請求，還是簡樸的異步請求，全部調(diào)用[requestcancel]delegate辦法，則設(shè)立：request如果只想取消一種請求，能夠設(shè)立隊列：queuesetShouldCancelAllRequestsOnFailure:NO如果想明確取消全部請求：queuecancelAllOperationsdelegatedelegate-{[requestclearDelegatesAndCancel];[requestrelease];[super}ASIFormDataRequestFormHeader會自動識別。ASIFormDataRequest*request=[ASIFormDataRequestrequestWithURL:url];[requestsetPostValue:@"Ben"forKey:@"first_name"];[requestsetPostValue:@"Copsey"[requestsetFile:@"/Users/ben/Desktop/ben.jpg"[requestaddData:imageDatawithFileName:@"george.jpg"andContentType:@"image/jpeg"forKey:@"photos"];ASIHTTPRequest*request=[ASIHTTPRequest[requestappendPostData:[@"Thisismydata"http://DefaultbecomesPOSTwhenyouuseappendPostData:/appendPostDataFromFile:/setPostBody:[requestrequestsetDownloadDestinationPath，能夠設(shè)立下載文獻(xiàn)用的下載目的目錄。temporaryFileDownloadPath目錄下。如果下載完畢會做下列事1downloadDestinationPath目錄中，臨時文獻(xiàn)信息：statusheader[request[[requestresponseHeaders]objectForKey:@"X-Powered-By"];[requestresponseEncoding];cookieCookieNSHTTPCookieStorage你能夠用[ASIHTTPRequestsetSessionCookies:nil];Cookies。Cookie//CreateaNSDictionary*properties=[[[NSMutableDictionaryalloc]init][propertiessetValue:[@"TestValue"encodedCookieValue][propertiessetValue:@"ASIHTTPRequestTestCookie"[propertiessetValue:@"."[propertiessetValue:[NSDatedateWithTimeIntervalSinceNow:60*60][propertiessetValue:@"/asi-http-request/tests"NSHTTPCookie*cookie=[[[NSHTTPCookiealloc]initWithProperties:properties]autorelease];//Thisurlwillreturnthevalueofthe'ASIHTTPRequestTestCookie'cookieurl=[NSURLURLWithString:@""];request=[ASIHTTPRequestrequestWithURL:url];[requestsetUseCookiePersistence:NO];[requestsetRequestCookies:[NSMutableArrayarrayWithObject:cookie]];[requeststartSynchronous];//Shouldbe:Ihave'TestValue'asthevalueofNSLog(@"%@",[request0.94[requestsetAllowResumeForFileDownloads:YES[requestsetDownloadDestinationPath:downloadPathASIHTTPRequest會自動保存訪問過的ＵＲＬ信息，并備之后用。在下列幾個場景非常有用：ASIDownloadCacheGet請求的響應(yīng)數(shù)據(jù)進(jìn)行緩存（200請求[ASIHTTPRequestsetDefaultCache:[ASIDownloadCacheASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requestsetDownloadCache:[ASIDownloadCachesharedCache]];request實(shí)例中：[cachesetStoragePath:@"/Users/ben/Documents/Cached-Downloads"];[selfsetMyCache:cache];ASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requestsetDownloadCache:[selfmyCache]];默認(rèn)緩存行為，request會先判斷與否存在緩存數(shù)據(jù)。a,如果沒有再進(jìn)行網(wǎng)絡(luò)請求。b，如果存，request將被取消（沒有錯誤信息）（這個在解決異常時非常有用你能夠設(shè)立緩存的數(shù)據(jù)需要保存多長時間，ASIHTTPRequest提供了兩種方略：儲。當(dāng)下次運(yùn)行或[ASIHTTPRequestclearSession]時，緩存將失效。ASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url[requestsetCacheStoragePolicy:ASICachePermanentlyCacheStoragePolicy];clearCachedResponsesForStoragePolicyHeader[[ASIDownloadCachesharedCache]setShouldRespectCacheControlHeaders:NO];request緩存的有效時間[requestsetSecondsToCache:60*60*24*30];30[requestdidUseCachedResponse[requestsetDownloadDestinationPath:[[ASIDownloadCachesharedCache]pathToStoreCachedResponseDataForRequest:request]];ASICacheDelegate默認(rèn)的狀況下，ASIHTTPRequesthttp//ConfigureaproxyservermanuallyNSURL*url=[NSURLURLWithString:@""];ASIHTTPRequest*request=[ASIHTTPRequestrequestWithURL:url];[requestsetProxyHost:@""];[requestsetProxyPort:3128//Alternatively,youcanuseamanually-specifiedProxyAutoConfigfile//(It'sprobablybestifyouusealocal[requestsetPACurl:[NSURLASIHTTPRequest,iOS4[requestsetShouldContinueWhenAppEntersBackground:YES[ASIHTTPRequestisNetworkInUsestatusbar[ASIHTTPRequestsetShouldUpdateNetworkActivityIndicator:NO[request