遇到問題：

????????眾多客戶端發(fā)送過來(lái)請(qǐng)求數(shù)據(jù)，如何找到該客戶端的 QTcpsocket對(duì)象給該對(duì)象回復(fù)消息？

解決辦法：

????????QTcpSocket *ptr =?? dynamic_cast<QTcpSocket *>(sender());

? ? ? ? 解釋：通過?dynamic_cast強(qiáng)行轉(zhuǎn)換。QTcpSocket *類型的對(duì)象、誰(shuí)發(fā)送了信號(hào)就會(huì)觸發(fā)

? ? ? ? ? ? ? ? ? ?sender()信號(hào)、獲取該信號(hào)的QTcpsocket *對(duì)象。

????????下面代碼可以獲取socket的port和ip

    //監(jiān)聽套接字
    tcpServer=new QTcpServer(this);

    //監(jiān)聽
    tcpServer->listen(QHostAddress::Any,8888);

    connect(tcpServer,&QTcpServer::newConnection,
            [=](){
                    //取出建立好連接的套接字
                    tcpSocket=tcpServer->nextPendingConnection();

                    //獲取對(duì)方的IP和端口
                    QString ip=tcpSocket->peerAddress().toString();
                    qint16 port =tcpSocket->peerPort();
                    QString ipDate=QString("[ip=%1 port=%2] 建立好連接了?。?).arg(ip).arg(port);

                    ui->textEdit->append(ipDate);
                    ui->buttonFile->setEnabled(true);
                }

            );

完整代碼如下

????????文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-531534.html

#include "server_code.h"

Server_code::Server_code(QObject *parent)
{
    socket_num =0;
    listen(QHostAddress::Any,8888);
    connect_db();
    qDebug()<<"服務(wù)器端口號(hào)已經(jīng)開啟: 8888";
}

void Server_code::connect_db()
{
    //創(chuàng)建連接對(duì)象
    db = QSqlDatabase::addDatabase("QMYSQL");
    //連接參數(shù)

    db.setPort(3306);
//    db.setHostName("47.105.188.189");
    db.setHostName("127.0.0.1");
    db.setDatabaseName("voice");
    db.setUserName("root");
    db.setPassword("123456");

    //如果連接成功
    if (db.open())
    {
        qDebug()<<"連接成功";

        //查詢  通過全局指針變量query指向連接成功的地址。
        query = new QSqlQuery();

    }
    else
    {
         qDebug()<<"連接失敗";

    }
}

void Server_code::incomingConnection(qintptr socketDescriptor)
/*產(chǎn)生鏈接的時(shí)候執(zhí)行這個(gè)     這個(gè)是產(chǎn)生socket的函數(shù)*/
{
    //生成tcpSocket對(duì)象
    socket = new QTcpSocket(this);



    //綁定這個(gè)鏈接來(lái)的兌現(xiàn)到socket中
    socket->setSocketDescriptor(socketDescriptor);


    only_socket.insert(socket_num,socket);

    //第一次連接發(fā)送 所有型號(hào)數(shù)據(jù)給客戶端
    model();

    //讀取他發(fā)來(lái)的消息、 使用receiveMessage去接收
    connect(socket,SIGNAL(readyRead()),this,SLOT(receiveMessage()));

    //傳遞數(shù)據(jù) 誰(shuí)上線了
//    emit giveMsg(socket->peerAddress().toString() + "上線",2);
    qDebug()<<socket->peerAddress().toString() + "上線";
    socket_num++;

}



void Server_code::receiveMessage()
{

    QTcpSocket* ptr  =dynamic_cast<QTcpSocket*>(sender());

    //讀取 字節(jié)流的方式  讀取客戶端發(fā)來(lái)的數(shù)據(jù)。
    QByteArray arr = ptr->readAll();
    QString str = arr.data();
    qDebug()<<str;
    //把信號(hào)傳遞出去  其中1代表客戶端機(jī)型、 后期要加用戶名和密碼在這里添加。
    emit giveMsg(str,1,ptr);

}

void Server_code::model()
{
    //連接的時(shí)候、顯示在客戶端的型號(hào)數(shù)據(jù)

    query->exec("select 型號(hào) from FRP_attr");
    QString model;
    while(query->next())
    {
         model = model + query->value(0).toString() + ",";
    };

    model = model + "型號(hào)";
    QByteArray send_model = model.toUtf8();
    socket->write(send_model);
}




//測(cè)試聲音系數(shù)
void Server_code::model_voice(QString one_model,QTcpSocket* ptr){

    query->exec("select 測(cè)試吸聲系數(shù) from 型號(hào)吸聲系數(shù)表 where 型號(hào) = '"+one_model+"' and 頻率 < 5001");
    QString test_voice;
    while(query->next())
    {
         test_voice = test_voice + query->value(0).toString() + ",";
    };

    test_voice = test_voice + "$$$";

//    qDebug()<<test_voice;

    QByteArray test_voice_lot = test_voice.toUtf8();
    ptr->write(test_voice_lot);
}


//測(cè)試物理/聲學(xué)系數(shù)
void Server_code::model_detail_data(QString one_model,QTcpSocket* ptr){

    query->exec("select * from frp_attr where 型號(hào) = '"+one_model+"'");
    QString model_info_data;
    while(query->next())
    {
         model_info_data = model_info_data + query->value(0).toString() + ",";
         model_info_data = model_info_data + query->value(1).toString() + ",";
         model_info_data = model_info_data + query->value(2).toString() + ",";
         model_info_data = model_info_data + query->value(3).toString() + ",";
         model_info_data = model_info_data + query->value(4).toString() + ",";
         model_info_data = model_info_data + query->value(5).toString() + ",";
         model_info_data = model_info_data + query->value(6).toString() + ",";
         model_info_data = model_info_data + query->value(7).toString() + ",";
         model_info_data = model_info_data + query->value(8).toString() + ",";
         model_info_data = model_info_data + query->value(9).toString() + ",";
         model_info_data = model_info_data + query->value(10).toString() + ",";
         model_info_data = model_info_data + query->value(11).toString() + "|";
    };
    model_info_data = model_info_data + "$$$";
    QByteArray model_info_data_lot = model_info_data.toUtf8();
    ptr->write(model_info_data_lot);
}

//理論系數(shù)
void Server_code::li_model_voice(QString one_model,QTcpSocket* ptr){

    query->exec("select `理論吸聲系數(shù)` from 型號(hào)吸聲系數(shù)表 where 型號(hào) = '"+one_model+"'and 頻率 < 5001");
    QString li_voice;
    while(query->next())
    {
         li_voice = li_voice + query->value(0).toString() + ",";
    };
//    li_voice = li_voice + "理論吸聲系數(shù)";
    QByteArray li_voice_lot = li_voice.toUtf8();
    ptr->write(li_voice_lot);
}

到了這里，關(guān)于Qt 服務(wù)器 獲取發(fā)送客戶端的QTcpSocket對(duì)象 和 該socket的ip和端口號(hào)的文章就介紹完了。如果您還想了解更多內(nèi)容，請(qǐng)?jiān)谟疑辖撬阉鱐OY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！