/******************************************************************************

Module: TimedMsgBox.cpp

Notices: Copyright (c) 2000 Jeffrey Richter

******************************************************************************/

#include "..\CmnHdr.h" /* See Appendix A. */

#include <tchar.h>

//////////////////////////////////////////////////////////////////////////////

// The caption of our message box

TCHAR g_szCaption[] = TEXT("Timed Message Box");

// How many seconds we'll display the message box

int g_nSecLeft = 0;

// This is STATIC window control ID for a message box

#define ID_MSGBOX_STATIC_TEXT 0x0000ffff

//////////////////////////////////////////////////////////////////////////////

VOID WINAPI MsgBoxTimeout(PVOID pvContext, BOOLEAN fTimeout) {

// NOTE: Due to a thread race condition, it is possible (but very unlikely)

// that the message box will not be created when we get here.

HWND hwnd = FindWindow(NULL, g_szCaption);

if (hwnd != NULL) {

// The window does exist; update the time remaining.

TCHAR sz[100];

wsprintf(sz, TEXT("You have %d seconds to respond"), g_nSecLeft--);

SetDlgItemText(hwnd, ID_MSGBOX_STATIC_TEXT, sz);

if (g_nSecLeft == 0) {

// The time is up; force the message box to exit.

EndDialog(hwnd, IDOK);

}

} else {

// The window does not exist yet; do nothing this time.

// We'll try again in another second.

}

}

//////////////////////////////////////////////////////////////////////////////

int WINAPI _tWinMain(HINSTANCE hinstExe, HINSTANCE, PTSTR pszCmdLine, int) {

chWindows9xNotAllowed();

// How many seconds we'll give the user to respond

g_nSecLeft = 10;

// Create a multishot 1 second timer that begins firing after 1 second.

HANDLE hTimerQTimer;

CreateTimerQueueTimer(&hTimerQTimer, NULL, MsgBoxTimeout, NULL,

1000, 1000, 0);

// Display the message box

MessageBox(NULL, TEXT("You have 10 seconds to respond"),

g_szCaption, MB_OK);

// Cancel the timer & delete the timer queue

DeleteTimerQueueTimer(NULL, hTimerQTimer, NULL);

// Let us know if the user responded or if we timed-out.

MessageBox(NULL,

(g_nSecLeft == 0) ? TEXT("Timeout") : TEXT("User responded"),

TEXT("Result"), MB_OK);

return(0);

}

//////////////////////////////// End of File /////////////////////////////////