#include <windows.h>
#include <commctrl.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

/* Global var */

char * className = "ProgressbarApp";
char * captionName = "Progressbar Application";

HWND hwndPB;

HINSTANCE hInstanceGlobal;

/* Function prototypes */

int APIENTRY WinMain( HINSTANCE, HINSTANCE, LPSTR, int );
BOOL InitApplication( HINSTANCE );
BOOL InitInstance( HINSTANCE, int );
LRESULT CALLBACK WndProc( HWND, UINT, WPARAM, LPARAM );

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

    hInstanceGlobal= hInstance;

    if (!InitApplication(hInstance))
        return FALSE;

    if (!InitInstance(hInstance, nCmdShow))
        return FALSE;

    while((GetMessage(&msg, NULL, 0, 0)) > 0)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return (int)msg.wParam;
}

/* Initialise Application */

BOOL InitApplication( HINSTANCE hInstance )
{

	WNDCLASS WndClass;
	WndClass.style = 0;
	WndClass.cbClsExtra = 0;
	WndClass.cbWndExtra = 0;
	WndClass.lpfnWndProc = WndProc;
	WndClass.hInstance = hInstance;
	WndClass.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1);
	WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
	WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	WndClass.lpszMenuName = NULL;
	WndClass.lpszClassName = className;

	return RegisterClass(&WndClass);
}

BOOL InitInstance( HINSTANCE hInstance, int nCmdShow )
{
    HWND hWnd = CreateWindow(className, captionName, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);

	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);

    if(!hWnd)
		return FALSE;

    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);
    return TRUE;
}

LRESULT CALLBACK WndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )
{
	switch(message)
	{
		case WM_CLOSE:
			DestroyWindow(hwnd);
			return 0;

		case WM_DESTROY:
			PostQuitMessage(0);
			return 0;

		case WM_CREATE:
			HWND hButton;
			RECT rcClient;

			int cyVScroll;
			hButton = CreateWindow("BUTTON", "Increment", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 100, 100, 100, 50, hwnd, (HMENU) 1, hInstanceGlobal, NULL);
			InitCommonControls();
			GetClientRect(hwnd, &rcClient);
			cyVScroll = GetSystemMetrics(SM_CYVSCROLL); 
			hwndPB = CreateWindowEx(0, PROGRESS_CLASS,(LPCTSTR) NULL, WS_CHILD | WS_VISIBLE,
			rcClient.left, rcClient.bottom - cyVScroll, rcClient.right, cyVScroll, 
			hwnd, (HMENU) 0, hInstanceGlobal, NULL); 

			SendMessage(hwndPB, PBM_SETRANGE, 0, MAKELPARAM(0, 100));
			SendMessage(hwndPB, PBM_SETSTEP, (WPARAM) 20, 0);
			break;

		case WM_COMMAND:
			if (HIWORD(wParam) == BN_CLICKED)
			{
				if(LOWORD(wParam) == 1)
				{
					static int counter = 0;
					if(!(counter > 4))
					{
						SendMessage(hwndPB, PBM_STEPIT, 0, 0);
						counter++;
					}
					else
					{
                        DestroyWindow(hwndPB);
					}

				}
			}
			break;

		default:
            return DefWindowProc(hwnd, message, wParam, lParam);
	}
	return 0;
}