当我的文本显示为问号时，这意味着什么？ [英] What does it mean when my text is displayed as Question Marks?

问题描述

我正试图在我的程序中使用（比如说）Windows GDI显示一些文本，而且一些unicode字符显示为问号？是什么？

另见：

在Windows中，当尝试显示Unicode字符时，会出现两个常见的显示问题：

1. 文本有时会出现问题标记
   
   

   
   
   • 当Unicode数据通常通过系统转换为8位字符集编码（或技术上的多字节字符）代码页（但可以在转换调用中指定其他代码页）。如果目标8位字符集不包含所需的字符，则目标字符集中不可表示的任何字符将转换为问号。
   
   



2. 文本有时显示为框
   
   

   
   
   • 对于特定字符不具有glpyh的字体，这是一个问题。当文档中的Unicode字符与字体支持的字符不匹配时，会显示框。具体而言，这些框表示所选字体不支持的字符。
   
   

I'm attempting to display some text in my program using (say) Windows GDI and some of the unicode characters are displayed as question marks? What is up?

See also: What does it mean when my text is displayed as boxes?

解决方案

In Windows there are 2 common display problems that occur when trying to display Unicode characters:

1. text sometimes appears as question marks

   • This occurs when Unicode data is converted to an 8-bit character set encoding (or technically multi-byte characters) usually via the system codepage (but other code pages can be specified in the conversion calls). If the target 8-bit character set doesn't include the characters needed, any characters not representable in the target character set get converted to question marks.

2. text sometimes appears as boxes

   • This is a problem with the font not having the glpyh for a particular character. Boxes show up when there is a mismatch between Unicode characters in the document and those supported by the font. Specifically, the boxes represent characters not supported by the selected font.

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