修改C ++ DLL以支持unicode - 要避免常见的陷阱？

I have a windows DLL that currently only supports ASCII and I need to update it to work with Unicode strings. This DLL currently uses char* strings in a number of places, along with making a number of ASCII Windows API calls (like GetWindowTextA, RegQueryValueExA, CreateFileA, etc).I have a windows DLL that currently only suppor