编码换行符NSXMLElement属性值中的字符 [英] Encoding Line Feed Characters in the value of a NSXMLElement's attribute
问题描述
正在读取和写入的XML数据库的注释字段存储为NSXMLElement的属性。一个条目包含换行符（0x0a）字符。这些是由非NSXML编码器编码的，我在解析为& #xA; ，并得到NSXML正确解析。它们导致NSString在内存中包含unicode值0x0a 0x00（intel字节排序）。
例如：
< INFO BITRATE =192000GENRE =PodcastCOMMENT =测试& amp;更多测试& #xA;& #xA; ; / INFO>
当将NSString写回NSXMLElement属性的值时，导致以下输出到xml文件：
< INFO BITRATE =192000GENRE =PodcastCOMMENT = 测试& amp;更多测试
换行符< / INFO>
当重新读取文件时，当然无法正确解析。
它似乎像节点选项像 NSXMLNodePreserveCharacterReferences 或 NSXMLNodePreserveEntities 应该是
我必须缺少明显的，但我一直被困在这一整天。
使用Apple检查，这是NSXMLDocument的一个已知问题，现在已作为错误报告提交。
建议的解决方法包括暂时使用libxml2。
如果我在未来的版本中看到这个问题，我会发表评论。 >
The comment field of an XML database I'm reading and writing is stored as the attribute of an NSXMLElement. One entry contains a line feed (0x0a) character. These are encoded by a non NSXML encoder in the document I'm parsing as 
 and get parsed correctly by NSXML. They result in the NSString containing the unicode value 0x0a 0x00 in memory (intel byte ordering).
For example:
<INFO BITRATE="192000" GENRE="Podcast" COMMENT="Test & More Test 

After the Line Feeds"</INFO>
When writing this NSString back out as the value of an NSXMLElement's attribute, it does not get encoded back and results in the following being output to the xml file:
<INFO BITRATE="192000" GENRE="Podcast" COMMENT="Test & More Test
After the Line Feeds"</INFO>
which of course does not get parsed properly upon re-reading the file again.
It seems like node options like NSXMLNodePreserveCharacterReferences or NSXMLNodePreserveEntities should be the way to go but it doesn't seem to help in any way.
I must be missing the obvious but I've been stuck on this all day.
Checked with Apple, this is a known issue with NSXMLDocument and it has now been filed as a bug report.
Suggested workaround include using libxml2 for the time being.
I will post a comment if I see this fixed in a future release.
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