Convert char array to Unicode

I am developing a device driver in Visual C++. I need to convert a character array to Unicode as well as wide character array in my driver.

Pointer to useful functions will be appreciated. I know "RtlInitUnicodeString"开发者_C百科 which concerts wchar to Unicode but need help for conversion of simple character arrays.

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If you are ok with the "current system locale" setting for the input encoding and the output in the usual UTF-16, the RtlAnsiStringToUnicodeString should be available in kernel-mode.