门急诊排队叫号系统demo的基本实现

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1. 门诊排队叫号系统

2. 基于QT实现UDP协议的发送

    //.h,头文件声明与UDP相关的类的头文件.    #include <QHostAddress>    #include <QUdpsocket>    typedef QSharedPointer<QUdpSocket> QUdpSocketPtr;    QUdpSocketPtr m_udpSocketSender;    QUdpSocketPtr m_udpSocketGetter;    //.cpp,源文件编写发送UDP命令包的逻辑.    m_udpSocketSender = QUdpSocketPtr(new QUdpSocket);    m_udpSocketGetter = QUdpSocketPtr(new QUdpSocket);    //指明主机和接收广播的机器ip都是本机：127.0.0.1    QHostAddress *host  = new QHostAddress("127.0.0.1");    QHostAddress *bcast = new QHostAddress("127.0.0.1");    //门诊叫号软件开放5020端口,接受HIS系统发送的UDP指令包.    m_udpSocketSender->connectToHost(*bcast,5020);    //负责监听发送UDP指令的那个端口号,以便接受叫号软件的5020端口返回的消息串.    qint16 portNum = m_udpSocketSender->localPort();    m_udpSocketGetter->bind(*host, m_udpSocketSender->localPort());    bool isConnect = false;    isConnect = m_udpSocketGetter->connect(m_udpSocketGetter, SIGNAL(readyRead()), m_udpSocketGetter, SLOT(readPendingDatagrams()));    //主机负责发送UDP报文,报文的内容为字符串,内容为"This is a test string."    QString sendMsg = QString("This is test string.");    QByteArray *datagram = new QByteArray(sendMsg.toUtf8());    m_udpSocketSender->write(*datagram);

3. demo的开发与测试

以下是根据文档，开发完成后的简单demo，可以模拟在实际门诊排队叫号系统运行时，HIS系统和叫号软件之间的UDP消息传输。

当在Web界面上点击“下一位”按钮时，网页会向叫号软件的5020端口发送如下UDP报文：
Action:LonbonTriageCall
Cmd:1 //Cmd是叫号软件的命令识别码，1-下一位；2-重呼；3-呼叫特定Sn; 4-过号；5-受理
Sn:0 //Sn是挂号的病人的挂号流水号。
MsgId:1 // MsgId是记录消息的次序，从1～9999取值。

参考链接：

1. QT如何发送和接收UDP报文
   https://stackoverflow.com/questions/6515589/how-do-i-send-and-receive-udp-packets-in-qt