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If you are upgrading your code from using the first function (wcstombs) to using the second (wcstombs_s), then to have your function processString return the same value, then IMO you will need to...

The difference is because the functions work slighty different.

wcstombs
If wcstombs successfully converts the multibyte string, it returns the number of bytes written into the multibyte output...

????????:confused: The length of a c-style char array is the number of characters from (and including) the start position proceeding (but not including) the null terminator.