问题
Possible Duplicate:
How to convert concatenated strings to wide-char with the C preprocessor?
I have a string literal defined using a #define:
#define B "1234\0"
How do I use this definition to get this wide string literal at compile time?:
L"1234\0"
(just the #defined string literal with L prepended to make it into a wide string).
I tried this:
#define MAKEWIDE(s) L##s
but this generates LB.
回答1:
Token pasting needs an additional level of indirection to deal properly with macros used as operands. Try something like:
#define PASTE(x, y) x##y
#define MAKEWIDE(x) PASTE(L,x)
回答2:
This will work just fine:
#define B "1234\0"
#define LB L"" B
来源：https://stackoverflow.com/questions/6603275/how-to-convert-defined-string-literal-to-a-wide-string-literal