writeToFile失败-如何调试为什么会失败(使用哪些工具)? [英] writeToFile fails - how do I debug WHY it fails (what tools)?

问题描述

我正在从JSON获取NSDictionary(使用SBJson)，我想存储它.我正在使用

I'm getting an NSDictionary from JSON (using SBJson), and I want to store it. I'm using

[liveData writeToFile:localFilePath atomically:YES]

，并且失败.数据看起来就像它的所有NSString，NSDictionary和NSArray(按原子方式:是"所要求的).我在其他地方使用了相同的localFilePath.

and it fails. The data looks like its all NSString, NSDictionary, and NSArray (which "atomically:YES" demands). I used the same localFilePath elesewhere.

所以我的问题是:如何找出问题出在哪里?我可以使用哪些工具来了解为什么writeToFile失败?日志未显示错误消息.

So my question is: how can I find out where the problem is? What tools can I use to understand why writeToFile fails? The log doesn't show an error message.

推荐答案

它可能有多种原因:

• 您正在写入的路径是错误的，不可写的(您没有写访问权限)，或者父目录不存在(如果 localFilePath 是"/path/to/file.plist"，但目录"/path/to/"不存在，它将失败)
• liveData词典确实包含不是PropertyList对象的对象.仅 NSData ， NSDate ， NSNumber ， NSString ， NSArray 或NSDictionary 对象可以写入属性列表文件(并且 writeToFile:atomically: do 写入plist文件，因此字典 do 必须仅包含PList对象，该方法才能成功)

• The path you are writing to is wrong, not writable (you don't have write access to it), or the parent directory does not exists (if localFilePath is "/path/to/file.plist" but the directory "/path/to/" does not exists, it will fail)
• The liveData dictionary does contains objects that are not PropertyList objects. Only NSData, NSDate, NSNumber, NSString, NSArray, or NSDictionary objects can be written into a Property List file (and writeToFile:atomically: do write to a plist file so the dictionary do have to contains only PList objects for that method to succeed)

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