Customising the Windows Message Box Example

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

#define MY_TIMER 1

HWND staticbox;
TCHAR countdown[10] = TEXT("");
HHOOK hMsgBoxHook;

//------------------------------------------------------------
// Timer callback
//------------------------------------------------------------
VOID CALLBACK MyTimerProc(HWND hWnd,
                          UINT uMsg,
                          UINT idEvent,
                          DWORD dwTime)
{
    static int timerCount = 10;

    wsprintf(countdown, TEXT("%d"), timerCount);

    SetWindowText(staticbox, countdown);

    if (timerCount == 0)
    {
        KillTimer(hWnd, MY_TIMER);

        SendMessage(hWnd, WM_CLOSE, 0, 0);

        return;
    }

    timerCount--;
}

//------------------------------------------------------------
// CBT Hook Procedure
//------------------------------------------------------------
LRESULT CALLBACK CBTProc(int nCode,
                         WPARAM wParam,
                         LPARAM lParam)
{
    HWND hwnd;
    HFONT font;

    switch (nCode)
    {
        case HCBT_ACTIVATE:

            hwnd = (HWND)wParam;

            staticbox = CreateWindow(
                TEXT("STATIC"),
                TEXT("10"),
                WS_CHILD | WS_VISIBLE | SS_CENTER,
                5,
                5,
                35,
                35,
                hwnd,
                (HMENU)1,
                NULL,
                NULL);

            font = CreateFont(
                25,
                0,
                0,
                0,
                FW_BOLD,
                FALSE,
                FALSE,
                FALSE,
                ANSI_CHARSET,
                OUT_DEFAULT_PRECIS,
                CLIP_DEFAULT_PRECIS,
                DEFAULT_QUALITY,
                DEFAULT_PITCH | FF_DONTCARE,
                TEXT("Times New Roman"));

            SendMessage(staticbox,
                        WM_SETFONT,
                        (WPARAM)font,
                        TRUE);

            SetTimer(hwnd,
                     MY_TIMER,
                     1000,
                     (TIMERPROC)MyTimerProc);

            return 0;
    }

    return CallNextHookEx(hMsgBoxHook,
                          nCode,
                          wParam,
                          lParam);
}

//------------------------------------------------------------
// WinMain
//------------------------------------------------------------
int WINAPI WinMain(HINSTANCE hInst,
                   HINSTANCE hPrev,
                   LPSTR lpCmdLine,
                   int nShowCmd)
{
    hMsgBoxHook = SetWindowsHookEx(
        WH_CBT,
        CBTProc,
        NULL,
        GetCurrentThreadId());

    MessageBox(
        NULL,
        TEXT(""),
        TEXT("Self Terminating Message Box"),
        MB_OK);

    UnhookWindowsHookEx(hMsgBoxHook);

    return 0;
}