NSXML替换“<<与“％lt”相比， [英] NSXML replacing "<" with "%lt;"

问题描述

我看到有其他问题与此相关，但没有使用NSXML。

I see there are other questions related to this, but none using NSXML.

所以，我使用NSXML从头构建一个XML文档，一个带有字符串值的NSXMLNode，所有的<该字符串中的字符将替换为& lt;

So, I'm constructing an XML document from scratch using NSXML and when I create a NSXMLNode with a string value, all the "<" characters in that string are replaced with "& lt;" when I output the node, or save it to a file.

例如：

 NSXMLNode *description = [NSXMLNode elementWithName:@"description"
                               stringValue:@"<![CDATA[Some Description</a>]]>"];

然后当我做

 NSLog(@"description: %@", description);

我得到所有'<'字符替换为& lt;的节点。但是当我做

I get the node with all the '<' characters replaced with "& lt;". However when I do

 NSLog(@"description string value: %@", [description stringValue]);

我得到正确的字符串输出。此XML文档将被保存为Google地球的KML文件，而Google地球在找到& lt;时会出现错误。令牌。任何想法如何使NSXML只输出'<'？我使用OSX 10.6和XCode 3.2 btw。

I get the correct string output. This XML document is going to be saved as a KML file for google earth, and google earth gives me an error when it finds the "& lt;" token. Any idea how to make NSXML just output the '<'? I'm using OSX 10.6 and XCode 3.2 btw.

推荐答案

有一个特殊的选项标志指示CDATA，诀窍是让可可为你写<！[CDATA [和]] >

There's a special options flag for indicating CDATA that will help here. The trick is to let cocoa write the <![CDATA[ and ]] bookends for you:

NSXMLNode *cdata = [[[NSXMLNode alloc] initWithKind:NSXMLTextKind
                                            options:NSXMLNodeIsCDATA] autorelease];
[cdata setStringValue:@"Some CDATA Description"];

NSXMLElement *description = [NSXMLNode elementWithName:@"description"];
[description addChild:cdata];

NSLog(@"description: %@", description);

// yields: <description><![CDATA[Some CDATA Description]]></description>

要获得带尖括号完整的字符串：

To obtain a string with the angle brackets intact:

NSString *output = [description XMLString];

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