上传背景图片模式 [英] Upload images on background mode

问题描述

我有我想用来上传图片到服务器的Web服务，通​​过wsdl2objc生成的Web服务代理类，它使用的NSOperation进行SOAP调用。在上传过程中我preSS home键和应用程序进入后台模式，会在这种情况下，什么假设？将上载过程终止？或进程将反正完成。

I have web service which i want to use to upload image to the server, web service proxy classes generated by wsdl2objc it uses NSOperation to perform soap calls. Suppose during the upload process i press the home button and application enters the background mode, what will be in that case? will the upload process terminate? or process will complete anyway.

推荐答案

默认情况下，操作系统将冻结您的应用程序在后台运行。当发生这种情况时，远程服务器可能会关闭一段时间后连接，因为您的应用程序没有响应。

By default, the OS will freeze your app in the background. When that happens, the remote server will probably close the connection after a while because your app doesn't respond.

您可以避免通过包装在一个后台任务上传code（使用方法 beginBackgroundTaskWithExpirationHandler：和 endBackgroundTask：），在这种情况下，操作系统将让在后台您的应用程序运行的另一个10分钟，以完成其工作。

You can avoid that by wrapping your upload code in a background task (with the methods beginBackgroundTaskWithExpirationHandler: and endBackgroundTask:), in which case the OS will let your app run in the background for another 10 minutes to finish its work.

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