Based on all the responses, this is what I have so far. It gets past the build stage, but it complains about no __DATA__ section, and also cannot find the openDevice() function 
package PIC::DevaSysI2CIO;
use strict;
use Inline C => Config =>
    LIBS => "-LE:/drivers/usb/devasys_i2cio -lusbi2cio",
    INC => "-IE:/drivers/usb/devasys_i2cio",
    BUILD_NOISY => 1;
use Inline C => q {
#include <windows.h>
#include "Usbi2cio.h"

HANDLE openDevice()
{
    HANDLE h = INVALID_HANDLE_VALUE;
    h = DAPI_OpenDeviceInstance("UsbI2cio", 0);
    return h;
}    
};

sub new {
    my ($class_name) = @_;
    
    my ($self) = {};
    
    bless($self, $class_name);
    
    return $self;
}

sub open_device {
    my $h = openDevice();
}

1;

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In reply to Re^2: Using Inline::C in a package by rem45acp
in thread Using Inline::C in a package by rem45acp

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