NSXMLParser 用 unicode 字符分割字符串 [英] NSXMLParser divides string with unicode characters

问题描述

我正在使用 NSXMLParser 从以下 xml 代码中获取以下字符串(sqrt(2 x)^(7/6)×(7/6)/(4/9)):

I am using NSXMLParser to get the following string(sqrt(2 x)^(7/6)×(7/6)/(4/9)) from the following xml code:

 <pod title='Input'
     scanner='Identity'
     id='Input'
     position='100'
     error='false'
     numsubpods='1'>
  <subpod title=''>
   <plaintext>sqrt(2 x)^(7/6)×(7/6)/(4/9)</plaintext>
  </subpod>
 </pod>

但输出字符串被 foundCharacters 函数分成两个单独的字符串，该函数返回以下结果(使用 NSLog):

But the output string is being divided into two separate strings by the foundCharacters function which returns the following result (using NSLog):

2011-11-11 18:29:46.005 Wolfram API-test[35959:f803] sqrt(2 x)^(7/6)2011-11-11 18:29:46.005 Wolfram API 测试 [35959:f803] ×(7/6)/(4/9)

2011-11-11 18:29:46.005 Wolfram API-test[35959:f803] sqrt(2 x)^(7/6) 2011-11-11 18:29:46.005 Wolfram API-test[35959:f803] ×(7/6)/(4/9)

解析代码如下:

-(void)parser:(NSXMLParser *) parser foundCharacters:(NSString *)string{
    if (elementFound) {
        [string canBeConvertedToEncoding:NSASCIIStringEncoding];
        NSLog(@"%@", string);
    }

}

所以我的问题是为什么输出字符串被分成两个单独的字符串?

So my question is why the output string is being divided into two separate strings?

推荐答案

我不知道为什么在这种情况下它会被划分，但总的来说，你不应该期望从 -parser:foundCharacters 获得的数据: 一次性全部返回.相反，您应该将从该方法获得的字符累积到一个字符串中.然后，当您的解析器委托被通知在 -parser:didEndElement:...

I'm not sure why it's being divided in this case, but in general you shouldn't expect the data you get from -parser:foundCharacters: to all be returned at once. Instead, you should accumulate the characters you get from that method in a string. You can then do something when your parser delegate is notified that the end tag has been received in -parser:didEndElement:...

unicode 字符可能是也可能不是您的数据被拆分的原因，但是否与您的代码无关.

The unicode character may or may not be the reason that your data was split up, but whether it was or wasn't shouldn't matter to your code.

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