Combining wide string literal with string macro

问题

I have a macro for a character string as follows:

#define APPNAME "MyApp"

Now I want to construct a wide string using this macro by doing something like:

const wchar_t *AppProgID = APPNAME L".Document";

However, this generates a "concatenating mismatched strings" compilation error.

Is there a way to convert the APPNAME macro to a wide string literal?

回答1:

Did you try

#define APPNAME "MyApp"

#define WIDEN2(x) L ## x
#define WIDEN(x) WIDEN2(x)

const wchar_t *AppProgID = WIDEN(APPNAME) L".Document";

来源：https://stackoverflow.com/questions/1690082/combining-wide-string-literal-with-string-macro