Win32::API and Inline::C should be able to help out here. Here's an Inline::C demo (based on some C code I found in my msdn documentation):

use warnings;

use Inline C => Config =>
    LIBS => '-lSetupAPI',
    BUILD_NOISY => 1;

use Inline C => <<'EOC';

#include <windows.h>
#include <setupapi.h>
#include <stdio.h>
#include <devguid.h>
#include <regstr.h>

int wrap_SetupDiGetClassDevs() {
    HDEVINFO hDevInfo;

    // Create a HDEVINFO with all present devices.
    hDevInfo = SetupDiGetClassDevs(NULL,
        0, // Enumerator
        0,
        DIGCF_PRESENT | DIGCF_ALLCLASSES );

    if (hDevInfo == INVALID_HANDLE_VALUE)
       croak("INVALID_HANDLE_VALUE returned");

    return hDevInfo;
}

void wrap_SetupDiDestroyDeviceInfoList(int hDevInfo) {
    SetupDiDestroyDeviceInfoList(hDevInfo);
}


void foo(int hDevInfo) {
    INLINE_STACK_VARS;
    SP_DEVINFO_DATA DeviceInfoData;
    DWORD i, DataT, buffersize;
    LPTSTR buffer;

    // Enumerate through all devices in Set.

    DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);

    INLINE_STACK_RESET;

    for (i=0;SetupDiEnumDeviceInfo(hDevInfo,i,
        &DeviceInfoData);i++)
    {
        buffer = NULL;
        buffersize = 0;

        //
        // Call function with null to begin with,
        // then use the returned buffer size
        // to Alloc the buffer. Keep calling until
        // success or an unknown failure.
        //
        while (!SetupDiGetDeviceRegistryProperty(
            hDevInfo,
            &DeviceInfoData,
            SPDRP_DEVICEDESC,
            &DataT,
            (PBYTE)buffer,
            buffersize,
            &buffersize))
        {
            if (GetLastError() ==
                ERROR_INSUFFICIENT_BUFFER)
            {
                // Change the buffer size.
                if (buffer) LocalFree(buffer);
                buffer = LocalAlloc(LPTR,buffersize);
            }
            else croak("ERROR 1 in sub foo");

        }

        INLINE_STACK_PUSH(sv_2mortal(newSVpv(buffer, 0)));

        if (buffer) LocalFree(buffer);
    }

    if ( GetLastError()!=NO_ERROR &&
       GetLastError()!=ERROR_NO_MORE_ITEMS )
         croak("ERROR 2 in sub foo");

    INLINE_STACK_DONE;
    INLINE_STACK_RETURN(i);
}

EOC

# perl code starts here:

my $handle = wrap_SetupDiGetClassDevs();

my @devices = foo($handle);

# clean up
wrap_SetupDiDestroyDeviceInfoList($handle);

print $_, "\n" for @devices;
[download]

Feel free to modify the code so that it does what you want. I don't think MinGW contains the requisite C header files, so you would need an MS compiler to run that code. And because the code passes a handle around, the compiler probably needs to be VC 6 (not VC 7 or 8) - assuming that your perl was built with VC 6.

So ... it may not be all that useful to you ... but it kept me occupied for a while :-)

Cheers,
Rob

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