想在报警的确认函数中将一个内部变量"tri"复位掉，但却无法复位。请版主给与帮助，万分感谢。下面是代码。

BOOL OnBtnSinglAckn(char* pszMsgWin)
{
// Acknowledges the selected message
CMN_ERROR ce;
BOOL bRetVal;

SetTagWord("tri",0);
bRetVal = MSRTMsgWinCommand( pszMsgWin, MSG_TB_QM, &ce );
if (!bRetVal)
printf("OnBtnSinglAckn returns FALSE");
return( bRetVal );

}