010 编辑器模板：将 int 转换为 wchar_t

Question

I'm reading a single wchar_t character from a binary file in 010 template in this way

wchar_t character;

it will give me for example 64 for @, after that I need to add 0x20 to the 64 so it should be 96 now
my question is how can I convert the output after add operation to wchar_t (or string) again in 010 template?

Answer 1

Presumably you are adding 0x20 to convert upper case ASCII letter to lower case. In this specific case it is safe, as long as this is for code points in ASCII range.

But these operations are not valid in general. UTF16 uses surrogate pairs for some code points, each code point can be 2 wchar_t . So in Windows for example, a code point is represented by 2-bytes or 4-bytes, you can't mess around with half it.

Use functions such as _strlwr to convert a string to lower case.

If reading ASCII characters between 0 and 128, it is guaranteed that these characters are not surrogate. This makes easy for example, if you are looking for \\n \\t A . , ; : \\n \\t A . , ; : \\n \\t A . , ; : , etc.

Use towlower if available, and wprintf for printing wchar_t

wint_t wch = towlower(L'A');
wprintf(L"%c", wch);