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CTimeCount ct;//计时
ct.start();
nret = hdc.OpenRec("L101.ic","20080721","23000");
nret = hdc.OpenRec("L101.ib","20080721","230000");
nret = hdc.OpenRec("L101.ic","20080721","230000");
nret = hdc.OpenRec("L101.p","20080721","230000");
nret = hdc.OpenRec("L101.q","20080721","230000");
ct.end();
CString szTimeCount;
szTimeCount.Format("%.6f毫秒",ct.time_milli()/5);
MessageBox(szTimeCount);