如何使用网络上传后台上传任务

本文介绍了如何使用网络上传后台上传任务的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我尝试使用AFNetworking上传大文件，并在应用程序在后台时继续上传。

我可以上传文件，但是当例外：EXC_BAD_ACCESS（code = 1，address = 0x8000001f））

<$ p $ $ b $ _ $ _ $ _ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ b _dispatch_root_queue_drain _dispatch_worker_thread3 _pthread_wqthread

以下是一些示例代码：注意：当我使用 [NSURLSessionConfiguration defaultSessionConfiguration] 时，上传成功，但当应用程序在后台时不会继续。 [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier：@company.appname.uploadservice] 导致应用程序崩溃。

NSMutableURLRequest * request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod：@POSTURLString：[uploadBundle.uploadUrl absoluteString] parameters：[uploadBundle getParameters] constructBodyWithBlock：^（id< AFMultipartFormData> formData） $ b [formData appendPartWithFileURL：uploadBundle.fileDataUrl name：uploadBundle.fileName fileName：uploadBundle.fileName mimeType：uploadBundle.mimeType error：nil]; }错误：无]; 认证*认证= [认证getInstance]; [request addValue：authentication.token forHTTPHeaderField：@token]; [request addValue：authentication.authorization forHTTPHeaderField：@Authorization]; // NSURLSessionConfiguration * configuration = [NSURLSessionConfiguration defaultSessionConfiguration]; NSURLSessionConfiguration * configuration = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier：@company.appname.uploadservice]; AFURLSessionManager * manager = [[AFURLSessionManager alloc] initWithSessionConfiguration：configuration]; NSProgress * progress = nil; _currentUploadTask = [manager uploadTaskWithStreamedRequest：request progress：& progress completionHandler：^（NSURLResponse * response，id responseObject，NSError * error）{ if（error）{ NSLog（@Error ：％@，错误）; } else { NSLog（@％@％@，response，responseObject）; } }];

解决方案

我正在回答我自己的问题，希望它将帮助一些人。 $ b $我找不到任何地方记录，但它看起来像你必须使用 uploadTaskWithRequest：fromFile：progress： completionHandler：当使用后台会话配置时。

这是一个简单的例子：

AppDelegate * appDelegate =（AppDelegate *）[[UIApplication sharedApplication] delegate]; id config = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier：@com.opentext.core.uploadservice]; id session = [NSURLSession sessionWithConfiguration：config delegate：appDelegate delegateQueue：[NSOperationQueue new]]; OMGMultipartFormData * multipartFormData = [OMGMultipartFormData new]; // [multipartFormData addFile：data parameterName：@filefilename：nil contentType：nil]; [multipartFormData addParameters：[uploadBundle getParameters]]; NSURLRequest * rq = [OMGHTTPURLRQ POST：[uploadBundle.uploadUrl absoluteString]：multipartFormData]; $ b $ id path = [[NSSearchPathForDirectoriesInDomains（NSCachesDirectory，NSUserDomainMask，YES）lastObject] stringByAppendingPathComponent：@upload.NSData]; [rq.HTTPBody writeToFile：path atomically：YES]; [[session uploadTaskWithRequest：rq fromFile：[NSURL fileURLWithPath：path]] resume];

I'm trying to upload large files using AFNetworking and have the upload continue when the application is in the background.

I can upload files just fine, but when I attempt to use a background configuration -- the application crashes with the following stacktrace: Exception: EXC_BAD_ACCESS (code=1, address=0x8000001f))

_CFStreamSetDispatchQueue -[__NSCFBackgroundDataTask captureStream:] __70-[__NSCFBackgroundDataTask _onqueue_needNewBodyStream:withCompletion:]_block_invoke_2 _dispatch_call_block_and_release _dispatch_queue_drain _dispatch_queue_invoke _dispatch_root_queue_drain _dispatch_worker_thread3 _pthread_wqthread

Here is some example code:

Note: When I use [NSURLSessionConfiguration defaultSessionConfiguration] the upload succeeds but will not continue when the application is in the background. [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"company.appname.uploadservice"] causes the application to crash.

NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:[uploadBundle.uploadUrl absoluteString] parameters:[uploadBundle getParameters] constructingBodyWithBlock:^(id<AFMultipartFormData> formData) { [formData appendPartWithFileURL:uploadBundle.fileDataUrl name:uploadBundle.fileName fileName:uploadBundle.fileName mimeType:uploadBundle.mimeType error:nil]; } error:nil]; Authentication *authentication = [Authentication getInstance]; [request addValue:authentication.token forHTTPHeaderField:@"token"]; [request addValue:authentication.authorization forHTTPHeaderField:@"Authorization"]; //NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration]; NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"company.appname.uploadservice"]; AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration]; NSProgress *progress = nil; _currentUploadTask = [manager uploadTaskWithStreamedRequest:request progress:&progress completionHandler:^(NSURLResponse *response, id responseObject, NSError *error) { if (error) { NSLog(@"Error: %@", error); } else { NSLog(@"%@ %@", response, responseObject); } }];

解决方案

I'm answering my own question in hopes that it will help a few people.

I can't find this documented anywhere, but it looks like you have to use uploadTaskWithRequest:fromFile:progress:completionHandler: when using a background session configuration.

Here is a simple example:

AppDelegate *appDelegate = (AppDelegate *) [[UIApplication sharedApplication] delegate]; id config = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:@"com.opentext.core.uploadservice"]; id session = [NSURLSession sessionWithConfiguration:config delegate:appDelegate delegateQueue:[NSOperationQueue new]]; OMGMultipartFormData *multipartFormData = [OMGMultipartFormData new]; //[multipartFormData addFile:data parameterName:@"file" filename:nil contentType:nil]; [multipartFormData addParameters:[uploadBundle getParameters]]; NSURLRequest *rq = [OMGHTTPURLRQ POST:[uploadBundle.uploadUrl absoluteString] :multipartFormData]; id path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"upload.NSData"]; [rq.HTTPBody writeToFile:path atomically:YES]; [[session uploadTaskWithRequest:rq fromFile:[NSURL fileURLWithPath:path]] resume];