Importing and Running Libraries in C

[a740g]

Basically, the idea is to create a ".h" file and write C / C++ functions in them that are QB64 friendly.
See:
DECLARE LIBRARY - QB64 Phoenix Edition Wiki
C Libraries - QB64 Phoenix Edition Wiki

Here is a short example that should print "1".

mybasapp.bas

Code: (Select All)

OPTION _EXPLICIT



DECLARE LIBRARY "myclib"

    FUNCTION bar& (BYVAL a AS LONG, BYVAL b AS LONG)

END DECLARE



PRINT foo(325, 2)



END



FUNCTION foo& (a AS LONG, b AS LONG)

    foo = bar(a, b)

END FUNCTION

myclib.h

Code: (Select All)

#pragma once

int bar(int a, int b)
{
    return a % b;
}

There are many rules. However, a few of them are as follows:

• Ensure the C/C++ library file has the extension ".h" and do not specify the extension in the DECLARE LIBRARY line.
  
• Ensure the C header library is in the same directory as your ".bas" source or in a relative directory as specified in the DECLARE LIBRARY line.
  
• Be careful about when to pass arguments to C functions by value or by reference.
  
• Be careful about the data types that are used (the links above have a comparison table)
  

I generally do a lot of mixed-language programming.
See a740g/Toolbox64: A740g's collection of libraries for QB64-PE (github.com) for some examples, and a740g/raylib-64: QB64-PE bindings for raylib (a simple and easy-to-use library to learn videogames programming) (github.com) for something a little more advanced.