Native Win32 Theme aware Owner-draw Controls without MFC

//******************************************
// Ewan Ward
// Copyright (C) Heavy Horse Research
// Program: OwnerDraw.exe
// FILE: main.CPP
//******************************************

#include "stdafx.h"
#include "MainDlg.h"
#include "commctrl.h"

#define OD_WINDOWNAME		"OWNERDRAW_WINDOW"
#define OD_CLASSNAME		"OWNERDRAW_CLASS"

HINSTANCE ghInst = NULL;
HWND ghMainWnd = NULL;
HWND ghDlgCurrent = NULL;

//
//  FUNCTION: ODWndProc(HWND, unsigned, WORD, LONG)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND	- process the application menu
//  WM_PAINT	- Paint the main window
//  WM_DESTROY	- post a quit message and return
//
//
LRESULT CALLBACK ODWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	return DefWindowProc(hWnd, message, wParam, lParam);
}
//
//   FUNCTION: InitInstance(HANDLE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
	UNREFERENCED_PARAMETER(nCmdShow);

	ghInst = hInstance; // Store instance handle in our global variable

	// setup invisible main window
	WNDCLASS  wc;
	wc.style         = 0;
	wc.lpfnWndProc   = (WNDPROC)ODWndProc;
	wc.cbClsExtra    = 0;
	wc.cbWndExtra    = 0;
	wc.hInstance     = hInstance;
	wc.hIcon         = LoadIcon(ghInst,MAKEINTRESOURCE(IDI_OWNERDRAW));
	wc.hCursor       = NULL;
	wc.hbrBackground = 0;
	wc.lpszClassName = OD_CLASSNAME;
	wc.lpszMenuName	 = NULL;

	RegisterClass(&wc);

	ghMainWnd = CreateWindow(OD_CLASSNAME, OD_WINDOWNAME, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

	if (!ghMainWnd)
	{
	  return FALSE;
	}

	return TRUE;
}

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
	UNREFERENCED_PARAMETER(hPrevInstance);
	UNREFERENCED_PARAMETER(lpCmdLine);

	MSG msg;

	HWND my_win = FindWindow(OD_CLASSNAME,OD_WINDOWNAME);
	if (my_win)
		{
		// IEWalker is already running
		ExitProcess(1);
		}

	// Perform application initialization:
	if (!InitInstance (hInstance, nCmdShow)) 
	{
		return FALSE;
	}
	
	InitCommonControls();

	ghDlgCurrent = DoMainDlg(ghMainWnd);

	// Main message loop:
	while(GetMessage(&msg, NULL, 0, 0)) 
	{
		if (NULL == ghDlgCurrent || !IsDialogMessage(ghDlgCurrent, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
		}
	}

	return msg.wParam;
}