Passing characters – PB Docs 2019

Passing chars to WinAPI

WinApi characters can have ANSI or Unicode values, while
PowerBuilder characters have only Unicode values. ANSI Char values
passed to and from WinAPI calls are automatically converted by
PowerBuilder. Therefore, when defining character array length, you
must always use the PowerBuilder character length (two bytes per
character).

Passing chars to C
functions

Char variables passed to external C functions are converted to
the C char type before passing. Arrays of Char variables are converted
to the equivalent C array of char variables.

An array of Char variables embedded in a structure produces an
embedded array in the C structure. This is different from an embedded
String, which results in an embedded pointer to a string in the C
structure.