mfc-VC++報錯，Access Violation.

VC++報錯，Access Violation.

void CDahaojiDlg::OnTimer(UINT nlDEvent)
{

---

if(nlDEvent==2)
{
CTimeSpan time=time2-time1;
strTime1.Format("%2d小時 %2d分 %2d秒",time.GetHours(),time.GetMinutes(),time.GetSeconds());
GetDlgItem(IDC_STATIC29)->SetWindowText(strTime1);
if(strTime1=="0小時0分0秒")
{
KillTimer(2);
SetTimer(21,1000,NULL);
}
}

---

}
On Timer中運行到GetDlgItem(__IDC__STATIC29)->SetWindowText(strTime1);
時出現Unhandled exception in xxx.exe (MFC42.DLL): 0XC0000005: Access Violation.本人是菜鳥不太懂，請各位大俠幫忙。_

最佳回答：

內存訪問錯誤，可能有空值