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pDlg->SerialSendData(m_judgeMsg); //该函数中调用了WriteToPort函数
judgeText = pDlg->GetLastMsg(); //该函数获取编辑框中的最后一行内容
....
if(judgeText == "xxx")
{
....
}
.....
pDlg->SerialSendData(m_commMsg);