Stop-Watch

#include <windows.h>
#include <windowsx.h>
#include <tchar.h>
#include <stdlib.h>

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

VOID CALLBACK TimerEvent( HWND window, UINT Msg, UINT_PTR EventID, DWORD SYSTime);

int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,
    LPSTR lpCmdLine, int nCmdShow )
{
    MSG  msg ;
    WNDCLASS wc;
    ZeroMemory(&wc, sizeof(wc));

    wc.lpszClassName = TEXT( "Timer" );
    wc.hInstance     = hInstance ;
    wc.hbrBackground = CreateSolidBrush(RGB(0,0,0));
    wc.lpfnWndProc   = WndProc ;
    wc.hCursor       = LoadCursor(0, IDC_ARROW);


    RegisterClass(&wc);
    CreateWindow( wc.lpszClassName, TEXT("Stop Watch"),
        WS_SYSMENU | WS_VISIBLE,
        150, 150, 230, 230, 0, 0, hInstance, 0);

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

int GlobTime = 0;

LRESULT CALLBACK WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    static HWND MenuItems[3] = {0};

    switch(msg)
    {
    case WM_CREATE:
        {
            MenuItems[0] = CreateWindow(TEXT("button"), TEXT("Старт"),
                WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON,
                120, 150, 80, 25,
                hwnd, (HMENU) 1, NULL, NULL);

            MenuItems[1] = CreateWindow(TEXT("button"), TEXT("Стоп"),
                WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON,
                20, 150, 80, 25,
                hwnd, (HMENU) 2, NULL, NULL);

            MenuItems[2] = CreateWindow(TEXT("button"), NULL,
                WS_VISIBLE | WS_CHILD | BS_GROUPBOX,
                20, 15, 180, 120,
                hwnd, (HMENU) 3, NULL, NULL);

            break;
        }

    case WM_COMMAND:
        {
            if(HIWORD(wParam) == BN_CLICKED)
            {
                if (LOWORD(wParam) == 1)
                {
                    GlobTime = 0;
                    KillTimer(hwnd, 1);
                    SetTimer(hwnd, 1, 1000, TimerEvent);
                }
                else if(LOWORD(wParam) == 2)
                {
                    GlobTime = 0;
                    InvalidateRect(hwnd, 0, false);
                    KillTimer(hwnd, 1);
                }
            }
            break;
        }
    case WM_PAINT:
        {
            PAINTSTRUCT ps;

            HDC hd = BeginPaint((HWND)MenuItems[2], &ps);

            HFONT hfontMSSS = CreateFont (80,40,FW_DONTCARE,FW_DONTCARE,FW_BOLD,
                FALSE,FALSE,FALSE,ANSI_CHARSET,OUT_DEFAULT_PRECIS,
                CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,FF_DONTCARE,L"System");

            SelectFont(hd, hfontMSSS);
            SetTextColor(hd, RGB(255,0,0));
            SetBkColor(hd, RGB(0,0,0));

            TCHAR timeNow[6] = {0}, csec[3] = {0}, cmin[3] = {0};
            int sec = GlobTime, mins = GlobTime;

            do
            {
                if(sec - 60 < 0 && sec != 0)
                {
                    wsprintfW(csec, sec > 9 ? L"%d" : L"0%d", sec);
                    break;
                }
                else if(!sec)
                {
                    wcscat(csec, L"00");
                    break;
                }

                sec -= 60;
            } while (1);

            //wcscat(timeNow, L":");

            if(GlobTime - sec == 0)
            {
                wcscat(cmin, L"00");
            }
            else
            {
                wsprintfW(cmin, (GlobTime - sec) / 60 > 9 ? L"%d" : L"0%d", (GlobTime - sec) / 60);
            }

            wsprintf(timeNow, L"%s:%s", cmin, csec);


            TextOut(hd, 0, 10, timeNow, _tcslen(timeNow));
            EndPaint(hwnd, &ps);
            break;
        }
    case WM_DESTROY:
        {
            KillTimer(hwnd, 1);
            PostQuitMessage(0);
            break;
        }
    }
    return DefWindowProc(hwnd, msg, wParam, lParam);
}

VOID CALLBACK TimerEvent( HWND window, UINT Msg, UINT_PTR EventID, DWORD SYSTime)
{
    if(++GlobTime > 60 * 60 - 1) GlobTime = 0;
    InvalidateRect(window, 0, false);
}