TCP 接收扩展 ASCII 或 utf-8 字符
对于倒问号 ¿ 我收到两个字节 [-62][-65] 但如何获得可读的 utf-8 或 ASCII 字符编码？
For inverted question mark ¿ I receive two bytes [-62][-65] but how would i get readable utf-8 or ASCII character encoding?
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这是该字符的 UTF8 代码。 倒问号是Unicode代码点
191< /code>，在 UTF8 中，是0xc2:0xbf。您将它们视为带符号的字节。例如，有符号的
-62是256-62或无符号的194- 即十六进制0xc2。同样，有符号的
-65是无符号的256-65或191- 即十六进制0xbf。如果要将 UTF8 序列转换为代码点，可以使用下表。
Range Encoding Binary value ----------------- -------- -------------------------- U+000000-U+00007f 0xxxxxxx 0xxxxxxx U+000080-U+0007ff 110yyyxx 00000yyy xxxxxxxx 10xxxxxx U+000800-U+00ffff 1110yyyy yyyyyyyy xxxxxxxx 10yyyyxx 10xxxxxx U+010000-U+10ffff 11110zzz 000zzzzz yyyyyyyy xxxxxxxx 10zzyyyy 10yyyyxx 10xxxxxx例如，您的
0xc2:0xbf是二进制11000010 10111111，它与第二种情况匹配：11000010 10111111 ||||| |||||| |||\\ ////// ||| |||||||| 00000000 10111111 -> 0x00bf -> 191That is the UTF8 code for that character. The inverted question mark is Unicode code point
191which, in UTF8, is0xc2:0xbf.You're seeing them as signed bytes. For example
-62signed is256-62or194unsigned - that's hex0xc2.Similarly,
-65signed is256-65or191unsigned - that's hex0xbf.If you want to convert your UTF8 sequence into a code point, you can use the table below.
Range Encoding Binary value ----------------- -------- -------------------------- U+000000-U+00007f 0xxxxxxx 0xxxxxxx U+000080-U+0007ff 110yyyxx 00000yyy xxxxxxxx 10xxxxxx U+000800-U+00ffff 1110yyyy yyyyyyyy xxxxxxxx 10yyyyxx 10xxxxxx U+010000-U+10ffff 11110zzz 000zzzzz yyyyyyyy xxxxxxxx 10zzyyyy 10yyyyxx 10xxxxxxFor example, your
0xc2:0xbfis binary11000010 10111111which matches the second case:11000010 10111111 ||||| |||||| |||\\ ////// ||| |||||||| 00000000 10111111 -> 0x00bf -> 191这 2 个字节可能是 UTF-8
对于 ASCII，您需要特定的代码页。
到底什么是“可读”字符编码？
Those 2 bytes probably are UTF-8
For ASCII you would need a specific codepage.
And what exactly is a 'readable' char encoding?
查看十六进制的字节值：
如果您查找 Unicode 信息，您可以看到，这实际上是构成倒问号字形的 UTF-8 编码的两个字节。
Look at the byte values in hexadecimal:
If you look up the Unicode information for the glyph in question, you can see that this is, inded, the two bytes that make up the UTF-8 encoding of the inverted question mark glyph.