以前有想做一个可以定时关闭的消息对话框,后来淡忘了,今天偶尔浏览到有实现这个功能的代码(来自微软),借来用用.

想想也挺简单的.
详细见代码.(在VC6.0中测试OK,WINDOWSXP).
/***********************************************************************
THISCODEANDINFORMATIONISPROVIDED"ASIS"WITHOUTWARRANTYOF
ANYKIND,EITHEREXPRESSEDORIMPLIED,INCLUDINGBUTNOTLIMITEDTO
THEIMPLIEDWARRANTIESOFMERCHANTABILITYAND/ORFITNESSFORA
PARTICULARPURPOSE.
Copyright1998MicrosoftCorporation.AllRightsReserved.
***********************************************************************/
/***********************************************************************
*
*MsgBox.c
*
*Abstract:
*
*Sampleprogramtodemonstratehowaprogramcandisplaya
*timedmessagebox.
*
**********************************************************************/
#defineSTRICT
#include<windows.h>
/**********************************************************************
*
*Overview
*
*Thekeytocreatingatimedmessageboxisexitingthedialog
*boxmessageloopinternaltothemessagebox.Sincethe
*messageloopforamessageboxispartofUSER,youcannot
*modifyitwithoutusinghooksandothersuchmethods.
*
*However,allmessageloopsexitwhentheyreceivea
*WM_QUITmessage.Furthermore,anestedmessageloop,ifit
*receivesaWM_QUITmessage,mustbreaktheloopandthenre-post
*thequitmessagesothatthenextouterlayercanprocessit.
*
*Therefore,youcangetthenestedmessagelooptoexitby
*callingPostQuitMessage().Thenestedmessageloopwill
*cleanupandpostanewquitmessage.WhentheMessageBox
*returns,youpeektoseeifthereisaquitmessage.Ifso,
*thenitmeansthatthemessageloopwasabnormallyterminated.
*YoualsoconsumetheWM_QUITmessageinsteadofre-postingit
*sothattheapplicationcontinuesrunning.
*
*Essentially,youhave"tricked"thenestedmessageloopinto
*thinkingthattheapplicationisterminating.Whenitreturns,
*you"eat"thequitmessage,effectivelycancelingthefake
*quitthatyougenerated.
*
**********************************************************************/
/**********************************************************************
*
*MessageBoxTimer
*
*Thetimercallbackfunctionthatpoststhefakequitmessage,
*whichcausesthemessageboxtoexitbecauseitthinksthat
*theapplicationisexiting.
*
**********************************************************************/
voidCALLBACKMessageBoxTimer(HWNDhwnd,UINTuiMsg,UINTidEvent,DWORDdwTime)
{
PostQuitMessage(0);
}
/***********************************************************************
*
*TimedMessageBox
*
*ThesameasthestandardMessageBox,exceptitalsoaccepts
*atimeout.Iftheuserdoesnotrespondwithinthe
*specifiedtimeout,thenthevalue0isreturnedinstead
*ofoneoftheID*values.
*
**********************************************************************/
UINTTimedMessageBox(HWNDhwndParent,LPCTSTRptszMessage,LPCTSTRptszTitle,UINTflags,DWORDdwTimeout)
{
UINTidTimer;
UINTuiResult;
MSGmsg;
/*
*Setatimertodismissthemessagebox.
*/
idTimer=SetTimer(NULL,0,dwTimeout,(TIMERPROC)MessageBoxTimer);
uiResult=MessageBox(hwndParent,ptszMessage,ptszTitle,flags);
/*
*Finishedwiththetimer.
*/
KillTimer(NULL,idTimer);
/*
*SeeifthereisaWM_QUITmessageinthequeue.Ifso,
*thenyoutimedout.Eatthemessagesoyoudon'tquitthe
*entireapplication.
*/
if(PeekMessage(&msg,NULL,WM_QUIT,WM_QUIT,PM_REMOVE)){
/*
*Ifyoutimedout,thenreturnzero.
*/
uiResult=0;
}
returnuiResult;
}
/***********************************************************************
*
*WinMain
*
*Programentrypoint.
*
*DemonstrateTimedMessageBox().
*
**********************************************************************/
intWINAPIWinMain(HINSTANCEhinst,HINSTANCEhinstPrev,LPSTRpszCmdLine,intnCmdShow)
{
UINTuiResult;
/*
*Asktheuseraquestion,andgivehimorherfivesecondsto
*answerit.
*/
uiResult=TimedMessageBox(NULL,"Doesatrianglehavethreesides?","Quiz",MB_YESNO,5000);//NULLfirstparameterisimportant.
switch(uiResult){
caseIDYES:
MessageBox(NULL,"That'sright!","Result",MB_OK);
break;
caseIDNO:
MessageBox(NULL,"Believeitornot,triangles"
"reallydohavethreesides.","Result",
MB_OK);
break;
case0:
MessageBox(NULL,"Isensedsomehesitationthere."
"ThecorrectanswerisYes.","Result",MB_OK);
break;
}
return0;
}