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while(1)
{
String^ receivedMsg1 = serialPort->ReadLine();
if (receivedMsg1 != "");
{
lLastMsgTime = System::DateTime::Now.Ticks;//取当前时间
while(1)
{
__int64 lNow = System::DateTime::Now.Ticks;
if((lNow - lLastMsgTime)/10000000 > 15){
String^ receivedMsg2 = serialPort->ReadLine();
if(receivedMsg2 == ""){
连接断开;
}
else if (receivedMsg2 != ""){
连接正常;
}
}
}
}
}