Sample declarations – PB Docs 2018

Suppose you have created a C dynamic library, SIMPLE.DLL, that
contains a function called SimpleFunc that accepts two parameters: a
character string and a structure. The following statement declares the
function in PowerBuilder, passing the arguments by reference:

By default, PowerBuilder handles string arguments and return
values as if they have Unicode encoding. If SimpleFunc passes ANSI
strings as arguments, you must use this syntax to declare it:

Declaring Windows API
functions

The Windows API includes over a thousand functions that you can
call from PowerBuilder. The following examples show sample declarations
for functions in the 32-bit Windows API libraries KERNEL32.DLL,
GDI32.DLL, and USER32.DLL.

The following statements declare a function that gets the handle
of any window that is called by name, and a function that releases the
open object handle:

The following statement declares a function that draws a pie chart
based on the coordinates received:

The following statement declares an external C function named
IsZoomed:

A script that uses IsZoomed is included as an example in Using utility functions to manage
information.

For more information about these functions, see the Microsoft
documentation in the MSDN Library at http://msdn.microsoft.com/en-us/library/ms674884(VS.85).aspx.