使用ASIHttp以不同的下载方式获得不同的结果

Question

我最近在尝试ASINetworkQueue，在这个过程中我遇到了一个非常奇怪的问题。

我尝试从大约30 MB大小的服务器下载一个zip，当我使用简单的ASIHttpRequest下载文件只需2分钟就可以下载，但是当我尝试将该请求放入ASINetworkQueue时，下载时间出乎意料地增加到了5分钟，这太奇怪了..如果任何人都可以说有什么不正确的话我会把代码片段。

[self setNetworkQueue:[ASINetworkQueue queue]];
[[self networkQueue] setDelegate:self];
[[self networkQueue] setShouldCancelAllRequestsOnFailure:NO];
[[self networkQueue] setMaxConcurrentOperationCount:1];
[[self networkQueue] setShowAccurateProgress:YES];

if (!progressBar)
{
    progressBar = [[UIProgressView alloc] init];
}
[[self networkQueue] setDownloadProgressDelegate:progressBar];
[[self networkQueue] setRequestDidFinishSelector:@selector(requestFinished:)];
[[self networkQueue] setRequestDidFailSelector:@selector(requestFailed:)];
[[self networkQueue] setQueueDidFinishSelector:@selector(queueFinished:)];

NSArray *arrFilenames = [[NSArray alloc] initWithObjects:@"Audio", nil];

for (NSString *strFilename in arrFilenames)
{

    NSString *strDestFolderName = @"Destination Path";


    BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:  [NSString stringWithFormat:@"%@.zip", strDestFolderName]];

    if(!fileExists)
    {
        NSURL *url = <File Url to be downloaded>;

        ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

        // This file has part of the download in it already
        [request setTemporaryFileDownloadPath:[NSString stringWithFormat:@"%@.zip.download", strDestFolderName]];
        [request setAllowResumeForFileDownloads:YES];
        [request setDownloadDestinationPath:[NSString stringWithFormat:@"%@.zip", strDestFolderName]];

        [request setTimeOutSeconds:30];
        [request setShouldContinueWhenAppEntersBackground:YES];
        [request setNumberOfTimesToRetryOnTimeout:2];
        request.userInfo = [NSDictionary dictionaryWithObjectsAndKeys: strFilename, @"fileName", nil];

        [[self networkQueue] addOperation:request];


    }

}




[[self networkQueue] go];

使用上面的代码，下载Audio.zip需要大约5分钟。但是当我执行以下操作时需要2分钟。

NSArray *arrFilenames = [[NSArray alloc] initWithObjects:@"Audio", nil];

for (NSString *strFilename in arrFilenames)
{

    NSString *strDestFolderName = @"Destination Path";


    BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:  [NSString stringWithFormat:@"%@.zip", strDestFolderName]];

    if(!fileExists)
    {
        NSURL *url = <File Url to be downloaded>;

        ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

        // This file has part of the download in it already
        [request setTemporaryFileDownloadPath:[NSString stringWithFormat:@"%@.zip.download", strDestFolderName]];
        [request setAllowResumeForFileDownloads:YES];
        [request setDownloadDestinationPath:[NSString stringWithFormat:@"%@.zip", strDestFolderName]];

        [request setTimeOutSeconds:30];
        [request setShouldContinueWhenAppEntersBackground:YES];
        [request setNumberOfTimesToRetryOnTimeout:2];
        request.userInfo = [NSDictionary dictionaryWithObjectsAndKeys: strFilename, @"fileName", nil];

        [request setDidFinishSelector:@selector(requestFinished:)];
        [request setDidFailSelector:@selector(requestFailed:)];
        [request setDownloadProgressDelegate:progressBar];

        [request start];


    }

}

注意 - 我只测试了一个文件，而不是多个文件，但我的目标是下载多个文件..

感谢。