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

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

/* Global var */

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

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 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(msg)
	{
		case WM_CLOSE:
			DestroyWindow(hwnd);
			return 0;

		case WM_DESTROY:
			PostQuitMessage(0);
			return 0;

		case WM_CREATE:
			void OnWmCreate(hInstanceGlobal, hwnd);
			break;

		case WM_COMMAND:
			if (HIWORD(wParam) == BN_CLICKED)
			{
				if(LOWORD(wParam) == 1)
				{
					OnButtonClicked();
				}
			}
			break;

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

void OnWmCreate( HINSTANCE hInstance, HWND hwnd )
{
	HWND hButton;
	RECT rcClient;
	HWND hwndPB;
	hButton = CreateWindow("BUTTON", "Increment", WS_CHILD | WS_VISIBLE | BS_PUSBUTTON, 100, 100, 100, 100, hwnd, (HMENU) 1, hInstanceGlobal, NULL);
	InitCommonControls();
	GetClientRect(hwndParent, &rcClient);
	hwndPB = CreateWindowEx(0, PROGRESS_CLASS, (LPCTSTR) NULL, WS_CHILD | WS_VISIBLE,
	rcClient.left, rcClient.bottom, rcClient.right - rcClient, rcClient.top - rcClient.bottom,
	hwnd, (HMENU) 0, hInstance, NULL);
	SendMessage(hwndPB, PBM_SETRANGE, 0, MAKELPARAM(0, 100));
    SendMessage(hwndPB, PBM_SETSTEP, (WPARAM) 20, 0);
	DestroyWindow(hwndPB);
}

void OnButtonClicked()
{
    SendMessage(hwndPB, PBM_STEPIT, 0, 0);
}