Need help with Steam Greenlight, steamworks integration

#include "steamworks_sdk_137\sdk\public\steam\steam_api.h"

#pragma comment (lib, "steam_api.lib")

if (SteamAPI_RestartAppIfNecessary(k_uAppIdInvalid))
{
	// if Steam is not running or the game wasn't started through Steam, SteamAPI_RestartAppIfNecessary starts the 
	// local Steam client and also launches this game again.
	
	// Once you get a public Steam AppID assigned for this game, you need to replace k_uAppIdInvalid with it and
	// removed steam_appid.txt from the game depot.

	return 0;
}

// Init Steam CEG
Steamworks_InitCEGLibrary();

if(!SteamAPI_Init())
{
	MessageBoxA(0, "Steam API Error!", "Failed to initialize the Steam API!", MB_OK);
	return 0;
}

if(!SteamUser()->BLoggedOn())
{
	MessageBoxA(0, "Steam API Error!", "You are not running Steam or you are not logged in!", MB_OK);
	return 0;
}

// do a DRM self check
Steamworks_SelfCheck();

SteamController()->Init();

...

// Shutdown the SteamAPI
SteamAPI_Shutdown();

// Shutdown Steam CEG
Steamworks_TermCEGLibrary();