From: Peter Gerwinski peter@gerwinski.de To: "Nathalie Jarosz" jarosz_n@hotmail.com Subject: Re: beta distribution Date: Wed, 28 Jun 2000 17:41:48 +0200

Hi, Nathalie!

...

I got the file `gpm.pas' but I don't really understand what I have to

do?

...

Is it like a model to understand how to use something written in C in

order

...

to compile it with gpc [...]

Exactly.

Some more instructions are in the GPC FAQ list.

In short: To use functions

extern double foo (double x);
extern void bar (void);

you write a Pascal unit as follows:

unit FooBar;

interface

function Foo (x: Real); C;
procedure Bar; C;

implementation

end.

Then your program can call the functions:

program Something;

uses
  FooBar;

begin
  Bar;
  writeln (Foo (42))
end.

Hope this helps,

Peter

PS: Better continue asking questions about GPC on the GPC mailing list, so everybody can profit from the answer. (Be welcome to forward this email to the list.)

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