问题描述
我成功使用TJ，Tj运算符回调从pdf获取文本...但是仍然缺少一些文本身份编码的文本..如何将其转换为text / NSString ???
i succeed to get text from pdf using TJ,Tj operator Callbacks ... but some texts are still missing which are identity-h encoded .. how to convert it to text/NSString ???
推荐答案
Identity-H编码意味着Type0字体（也称为CID键控字体），因此您必须参考嵌入式ToUnicode映射。你在TJ，Tj，单引号和双引号（四个文本显示运算符）中获得的字符不是unicode，而是在当前字体之外没有任何意义的任意字符ID。
Identity-H encoding implies a Type0 font (also known as a CID-keyed font), so you have to consult the embedded ToUnicode mapping. The characters you get in TJ, Tj, single quotation and double quotation (the four text-showing operators) are not unicode, but rather arbitrary character IDs that have little meaning outside the current font.
PDF规范文档非常清晰，但阅读要求非常高。
The PDF specification document is very clear, but quite a demanding read.
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