NAME

FFI::C::StructDef - Structured data definition for FFI

VERSION

version 0.15

SYNOPSIS

In your C code:

#include <stdint.h>
#include <stdio.h>

typedef struct {
  uint8_t red;
  uint8_t green;
  uint8_t blue;
} color_t;

void
print_color(color_t *c)
{
  printf("[%02x %02x %02x]\n",
    c->red,
    c->green,
    c->blue
  );
}

In your Perl code:

use FFI::Platypus 1.00;
use FFI::C::StructDef;

my $ffi = FFI::Platypus->new( api => 1 );
# See FFI::Platypus::Bundle for how bundle works.
$ffi->bundle;

my $def = FFI::C::StructDef->new(
  $ffi,
  name  => 'color_t',
  class => 'Color',
  members => [
    red   => 'uint8',
    green => 'uint8',
    blue  => 'uint8',
  ],
);

my $red = Color->new({ red => 255 });

my $green = Color->new({ green => 255 });

$ffi->attach( print_color => ['color_t'] );

print_color($red);   # [ff 00 00]
print_color($green); # [00 ff 00]

# that red is a tad bright!
$red->red( 200 );

print_color($red);   # [c8 00 00]

DESCRIPTION

This class creates a def for a C struct.

CONSTRUCTOR

new

my $def = FFI::C::StructDef->new(%opts);
my $def = FFI::C::StructDef->new($ffi, %opts);

For standard def options, see FFI::C::Def.

members

This should be an array reference containing name, type pairs, in the order that they will be stored in the struct.

trim_string

If true, fixed-length strings should be treated as null terminated strings and be trimmed.

METHODS

create

my $instance = $def->create;
my $instance = $def->class->new;          # if class was specified
my $instance = $def->create(\%init);
my $instance = $def->class->new(\%init);  # if class was specified

This creates an instance of the struct, returns a FFI::C::Struct.

You can optionally initialize member values using %init.

trim_string

my $bool = $def->trim_string;

Returns true if fixed-length strings should be treated as null terminated strings and be trimmed.

SEE ALSO

FFI::C

FFI::C::Array

FFI::C::ArrayDef

FFI::C::Def

FFI::C::File

FFI::C::PosixFile

FFI::C::Struct

FFI::C::StructDef

FFI::C::Union

FFI::C::UnionDef

FFI::C::Util

FFI::Platypus::Record

AUTHOR

Graham Ollis <plicease@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2020-2022 by Graham Ollis.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

cpanm FFI::C

perl -MCPAN -e shell
install FFI::C