AFNetworking无法下载大文件 [英] AFNetworking fails to download large files

问题描述

我目前正在尝试使用AFNetworking下载一些文件，对于相对较小的文件，这似乎有效，但我正在尝试更小的文件（17MB），它似乎只是崩溃而没有任何错误。

I'm currently trying to download some files with AFNetworking, for relative small files this seems to work, but I'm trying a slighter larger file (17MB) and it seems to just crash without any error.

网址链接到本地​​文件： http：//test.local/wp-content/uploads/2012/07/test.pdf （我在模拟器中运行它，因此可以访问）

The url is linking to a local file: http://test.local/wp-content/uploads/2012/07/test.pdf (I'm running it in the simulator, so this is accessible)

我得到的唯一输出是在进度块中

The only output I get is in the progress block

进度：0.009022

progress: 0.009022

当我检查文件系统时，看来该文件在那里，但只有几kb。

When I check the filesystem, it appears that the file is there, but only a few kb.

这是AFNetworking的一个已知错误，或者我只是做错了。

Is this a known error with AFNetworking, or maybe I'm just doing something wrong.

- (void)downloadIssue:(Issue *)issue
{
    NSString *fileName = [issue.pdf lastPathComponent];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *filePath = [documentsDirectory stringByAppendingPathComponent:fileName];

    NSURL *url = [NSURL URLWithString:issue.pdf];
    AFHTTPClient *httpClient = [[[AFHTTPClient alloc] initWithBaseURL:url] autorelease];
    NSURLRequest *request = [httpClient requestWithMethod:@"GET" path:issue.pdf parameters:nil];

    AFURLConnectionOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
operation.outputStream = [NSOutputStream outputStreamToFileAtPath:filePath append:NO];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"PDF DOWNLOAD COMPLETE");

        issue.pdf_location = filePath;

        // send out a notification with the issue
        [[NSNotificationCenter defaultCenter] postNotificationName:@"PDF_DOWNLOAD_COMPLETE" object:nil userInfo:[NSDictionary dictionaryWithObject:issue forKey:@"issue"]];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"PDF DOWNLOAD FAILED");

    // send out a notification with the issue
    [[NSNotificationCenter defaultCenter] postNotificationName:@"PDF_DOWNLOAD_FAILED" object:nil userInfo:[NSDictionary dictionaryWithObject:issue forKey:@"issue"]];
    }];

    [operation setDownloadProgressBlock:^(NSInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
        float progress = (float)totalBytesRead / totalBytesExpectedToRead;

        NSLog(@"progress: %f", progress);

        [[NSNotificationCenter defaultCenter] postNotificationName:@"PDF_DOWNLOAD_PROGRESS" object:nil userInfo:[NSDictionary dictionaryWithObjectsAndKeys: issue, @"issue", progress, @"progress", nil]];
    }];

    [_queue addOperation:operation];
}

推荐答案

我以前有类似的经历因为你有问题。尝试解决这个问题，它花了差不多两个星期。

I previously had a similar experience as you problem. Try to resolve this issue, it took over almost two weeks.

同样的问题与你有关。所以我很高兴终于见到你了：）

The same problem was with you. So I'm glad to finally meet you :)

这是解决方案。

如果在downloadProgress块中直接更新UI，有时会发生未知错误。因为暧昧，但我认为主线程崩溃。所以，downloadProgress Block只更新变量，使用变量执行定时器更新UI。

if in downloadProgress block directly update UI, sometimes occur unknown error. because Ambiguous, but i think Main Thread crash. so, downloadProgress Block only update variable, execute timer update UI using a variable.

//At the same time download
myTimer = [NSTimer timerWithTimeInterval:0.1f target:self selector:@selector(updateProgress:) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:processTimer forMode:NSRunLoopCommonModes];

[operation setDownloadProgressBlock:^(NSInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead)
{
    //global ivar
    _progress = (float)totalBytesRead / totalBytesExpectedToRead;
}];

- (void)updateProgress:(NSTimer *)timer
{
    myProgressView.progress = _progress;
    if(fabs(1.f-_progress)<0.01f)
    {
        [timer invalidate];
    }
}

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