A string in C is simply a buffer with a 0 as last byte. Only C string commands will consider that last byte. You should use a bank in Blitz, fill it as you want and pass its pointer (i.e. by reference) and eventually its length to your DLL. If you need your DLL being able to modify the buffer you pass, you should use a bank in Blitz, not a string.
Passing Strings to a DLL
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