下载Firebase存储文件设备问题 [英] Downloading Firebase Storage Files Device Issue

问题描述

我正在尝试从Firebase存储中下载一个单词文档。在模拟器上，一切都按预期工作。然而在我的设备上，我收到以下错误：

I am trying to download a word document from Firebase storage. On the simulator everything is working as expected. Yet on my device, I get the following error:

可选（错误域= FIRStorageErrorDomain代码= -13000发生未知错误，请检查服务器响应。UserInfo = {object = Bulletin / 2016年10月26日.docx，bucket = southam-college-app.appspot.com，NSLocalizedDescription =发生未知错误，请检查服务器响应。ResponseErrorDomain = NSCocoaErrorDomain，NSFilePath = / tmp / bulletin，NSUnderlyingError = 0x1702590b0 {Error Domain = NSPOSIXErrorDomain Code = 1不允许操作}，ResponseErrorCode = 513}）

Optional(Error Domain=FIRStorageErrorDomain Code=-13000 "An unknown error occurred, please check the server response." UserInfo={object=Bulletin/26 October 2016.docx, bucket=southam-college-app.appspot.com, NSLocalizedDescription=An unknown error occurred, please check the server response., ResponseErrorDomain=NSCocoaErrorDomain, NSFilePath=/tmp/bulletin, NSUnderlyingError=0x1702590b0 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}, ResponseErrorCode=513})

其他帖子我一直在看着似乎没有给我一个工作的答案，我所知道的是，有文件权限的问题，即使我使用推荐的目录（tmp）。

Other posts I have been looking at do not seem to give me a working answer, and all I know is that there is an issue with file permissions, even though I am using the recommended directory (tmp).

这是下载文件的代码

 let Ref_Bulletin = Bulletin.referenceForURL("gs://southam-college-app.appspot.com/Bulletin/\(Today.stringFromDate(NSDate())).docx")

    // Create local filesystem URL
    let localURL: NSURL! = NSURL(string: "file:///tmp/bulletin/today.docx")


        // Download to the local filesystem
        let downloadTask = Ref_Bulletin.writeToFile(localURL) { (URL, error) -> Void in
            if (error != nil) {
                print(error.debugDescription)
                // Uh-oh, an error occurred!
            } else {
                print("Working As Expected")
                self.Web_View.loadRequest(NSURLRequest(URL: localURL))
            }

那么是什么原因导致这个问题，我该如何解决？

So what is causing this problem and how do I fix it?

更新：

所以我试图创建目录，但我被告知我没有权限，即使文档说我可以写tmp。

So I tried to create the directory but I am being told that I don't have permission even though the documentation says I can write to the tmp.

无法创建目录Error Domain = NSCocoaErrorDomain Code = 513您没有权限保存文件今天。文件夹bulltin中的docx。 UserInfo = {NSFilePath = / tmp / bulltin / today.docx，NSUnderlyingError = 0x1702498a0 {错误域= NSPOSIXErrorDomain代码= 1不允许操作}}

Unable to create directory Error Domain=NSCocoaErrorDomain Code=513 "You don’t have permission to save the file "today.docx" in the folder "bulltin"." UserInfo={NSFilePath=/tmp/bulltin/today.docx, NSUnderlyingError=0x1702498a0 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}

这是创建目录的代码：

 do {
        try NSFileManager.defaultManager().createDirectoryAtPath(localURL.path!, withIntermediateDirectories: true, attributes: nil)
    } catch let error as NSError {
        NSLog("Unable to create directory \(error.debugDescription)")
    }

推荐答案

我认为这里的问题是 tmp 和文件目录实际上不在 / tmp 和 / Documents （例如，它看起来好像 / Documents 实际上 /用户/ Documents ，其实际上是 / private / var / mobile / Documents ，请参见： https://www.theiphonewiki.com/wiki/ ）

I assume that the issue here is that the tmp and Documents directories don't actually live at /tmp and /Documents (for instance, it appears as though /Documents is actually /User/Documents, which is actually /private/var/mobile/Documents, see: https://www.theiphonewiki.com/wiki/)

您需要确保创建基于文件的URL关闭系统认为这些目录，而不是字符串：

You'll want to make sure you're creating your File URLs based off where the system thinks those directories are, rather than a string:

NSURL *tmpDirURL = [NSURL fileURLWithPath:NSTemporaryDirectory()];
NSURL *fileURL = [[tmpDirURL URLByAppendingPathComponent:@"my_file"] URLByAppendingPathExtension:@"txt"];

或类似的 NSDocumentDirectory 。至于为什么在模拟器上工作：我认为这是因为模拟器上的沙盒不像真实设备那样工作，而 / tmp 显然是您可以写的有效位置（尽管可能不是您想要写的两个），如果您尝试在真实设备上执行此操作，则iOS会抛出嘶嘶作用）。

Or similar for NSDocumentDirectory. As for why that works on the simulator: I assume this is because sandboxing on the simulator doesn't work the same way as a real device, and that /tmp is apparently a valid location you can write to (though likely not the one you want to be writing two, as evidenced by iOS throwing a hissy fit when you try to do it on a real device).

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