netripper

// KeypadLedControl.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <windows.h>

// From MSDN: http://msdn.microsoft.com/en-us/library/ms838354.aspx
#define QUERYESCSUPPORT 8
#define SETPOWERMANAGEMENT 6147
#define GETPOWERMANAGEMENT 6148

typedef struct VIDEOPOWER_MANAGEMENT {
    ULONG Length;
    ULONG DPMSVersion;
    ULONG PowerState;
} VIDEO_POWER_MANAGEMENT, *PVIDEO_POWER_MANAGEMENT;

int _tmain(int argc, _TCHAR* argv[])
{
    // Create an event for ourselves, so that we can be turned off as well
    HANDLE appEvent = CreateEvent(NULL, TRUE, FALSE, L"KeypadLedControlApp");
    if (appEvent == NULL)
    {
        MessageBox(NULL, L"Couldn't create an event for ourselves", L"Error", MB_OK);
        return 1;
    }

    // If the app is already running, we set the event so that it will close itself.
    if (GetLastError() == ERROR_ALREADY_EXISTS)
    {
        SetEvent(appEvent);
        CloseHandle(appEvent);
        return 1;
    }

    // Get the keyped led event (this one is used for Leo at least)
    HANDLE iconEvent = CreateEvent(NULL, TRUE, FALSE, L"IconLedOnEvent");
    if (iconEvent == NULL)
    {
        // Oops, error creating the event?
        MessageBox(NULL, L"Couldn't create the 'IconLedOnEvent' keypad light event", L"Error", MB_OK);
        return 1;
    }
    if (GetLastError() != ERROR_ALREADY_EXISTS)
    {
        // This even didn't exist yet. Let's see if we can try another event (it's IconLedEvent for Rhodium)
        CloseHandle(iconEvent);
        iconEvent = CreateEvent(NULL, TRUE, FALSE, L"IconLedEvent");
        if (iconEvent == NULL)
        {
            MessageBox(NULL, L"Couldn't create the 'IconLedEvent' keypad light event", L"Error", MB_OK);
            return 1;
        }
        if (GetLastError() != ERROR_ALREADY_EXISTS)
        {
            // This event didn't exist either.
            MessageBox(NULL, L"Sorry, this device is not supported it seems", L"Error", MB_OK);
            CloseHandle(iconEvent);
            return 1;
        }
    }

    // Check if the driver supports power management information
    HDC gdc = GetDC(NULL);
    int iESC = GETPOWERMANAGEMENT;
    if (ExtEscape(gdc, QUERYESCSUPPORT, sizeof(int), (LPCSTR)&iESC, 0, NULL) == 0)
    {
        MessageBox(NULL, L"This device does not support checking for LCD state", L"Error", MB_OK);
        CloseHandle(iconEvent);
        ReleaseDC(NULL, gdc);
        return 1;
    }

    VIDEO_POWER_MANAGEMENT pm;
    pm.Length = sizeof(pm);
    int ret;
    while (true)
    {
        // Get current power management information
        ret = ExtEscape(gdc, GETPOWERMANAGEMENT, 0, NULL, pm.Length, (LPSTR)&pm);

        // If the LCD is on, set the event so that the lights go on
        if (pm.PowerState == 1)
        {
            SetEvent(iconEvent);
        }

        // We'll keep on running this app as long as the event hasn't been set (by starting this app again)
        if (WaitForSingleObject(appEvent, 8000) != WAIT_TIMEOUT)
        {
            break;
        }
    }

    // Cleanup
    ReleaseDC(NULL, gdc);
    CloseHandle(iconEvent);
    CloseHandle(appEvent);

    return 0;
}