How to convert from LPCTSTR to a Byte array

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C++/CLI

string

conversion

Hi all,
I have to use an existing C++ dll with methods that accept a array<byte> for some calculations.
I have an LPCTSTR and I am using Unicode, how can I convert those strings into byte arrays?
How to convert them back to LPCTSTR?

I tried in a few ways but, when it does compile, all I get is the first letter as if it was not considering the 2 bytes.

Thanks in advance,
Marco H.

Thanks you for your help.
This is the problem:

int MyMethod(LPCTSTR inputA)
{
    array<Byte>^ MyStringArray = inputA?????? // Byte[] version from inputA
    ..
    LPCTSTR MyString = MyString???// converted string from MyStringArray
    ..
}

Dll is not Unicode now, probably in future, depends on the customer.
LPCTSTR is OK for Ascii and Unicode, how to convert if inputA is Ascii or Unicode?

WideCharToMultiByte if Unicode? if Ascii?

Thanks,

Marco H.