将任意NSData写入NSXMLElement的最佳方式 [英] Best way to write arbitrary NSData into an NSXMLElement

问题描述

我允许将应用程序数据（它是10.7上的Mac应用程序）导出为XML文件，并且一个字段我想能够从XML导出/导入为 NSData 字段。什么是正确/接受的方式这样做？我应该转换为base64 并将该字符串写入XML吗？

I am allowing for application data (it's a Mac app on 10.7) to be exported as an XML file, and one field I would like to be able to export/import to/from XML is an NSData field. What would be the correct/accepted way of doing this? Should I convert to base64 and write that string to XML?

我不想滚动我自己的解决方案，使用类别，作为链接问题的接受答案（链接到 Matt Gallagher的解决方案）。

I would prefer not to roll my own solution, using a category, as the accepted answer to the linked question does (linking to Matt Gallagher's solution).

更新

我刚刚发现了 NSPropertyListSerialization 类。我得到了希望，但它只有静态序列化方法返回 NSData 表示。

推荐答案

我意识到（作为我更新的暗示），我可以使用 -dataWithPropertyList：返回的 NSData 格式：NSPropertyListSerialization_Class / Reference / Reference.htmlrel =nofollow> NSPropertyListSerialization options：error：只是一个UTF-8字符串。这是我用来序列化：

I realized (as my updated alluded to) that I could use the NSPropertyListSerialization class, since the NSData returned by -dataWithPropertyList:format:options:error: is just a UTF-8 string. This is what I'm using to serialize:

NSData *data = value;

NSError *error = nil;
NSData *plistData = [NSPropertyListSerialization dataWithPropertyList:data
                                                               format:NSPropertyListXMLFormat_v1_0
                                                              options:0
                                                                error:&error];
if (error) {
    NSLog(@"Error serializing data to plist XML: %@", error);
} else {
    NSString *plistString = [[NSString alloc] initWithData:plistData encoding:NSUTF8StringEncoding];
    NSXMLElement *dataElement = [NSXMLElement elementWithName:field
                                                  stringValue:plistString];
}

并反序列化：

NSData *plistData = [element.stringValue dataUsingEncoding:NSUTF8StringEncoding];
NSData *originalData = [NSPropertyListSerialization propertyListWithData:plistData
                                                                 options:NSPropertyListImmutable
                                                                  format:NULL
                                                                   error:&error];

if (error) {
    NSLog(@"Error deserializing data from plist XML: %@", error);
} else {
    value = originalData;
}

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