Qt学习（四）

前一阶段学习了基于TCP的服务器和客户端编程，并根据书本上的实例将其改为自己需要实现的功能：

客户端为一调查问卷，用户填写完毕后点击“提交”按钮，则填写的选项信息会在服务器上显示，同时，服务器返回提交成功的语句显示到客户端界面。需要注意的是，客户端界面提交后，界面会初始化，即用户名、题目选项等都清空。

具体界面框图如下：

操作过程中：

提交后界面：

客户端源代码如下：

项目文件 QuesTcpClient.pro

#-------------------------------------------------
#
# Project created by QtCreator 2019-07-24T08:24:42
#
#-------------------------------------------------

QT       += core gui
QT       += network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = QuesTcpClient
TEMPLATE = app


SOURCES += main.cpp\
        questcpclient.cpp

HEADERS  += questcpclient.h

头文件 questcpclient.h

#ifndef QUESTCPCLIENT_H
#define QUESTCPCLIENT_H

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#include 
#include 
#include 
#include 

class QuesTcpClient : public QDialog
{
    Q_OBJECT

public:
    QuesTcpClient(QWidget *parent = 0);
    ~QuesTcpClient();

private:
    QLabel *title_label;
    QLabel *ques1_label;
    QLabel *ques2_label;
    QLabel *ques3_label;
    QLabel *ques3A_label;
    QLabel *ques3B_label;
    QLabel *ques3C_label;
    QLabel *ques3D_label;
    QLabel *message_label;

    QPalette pe;

    QPushButton *save_button;
    QPushButton *send_button;

    QButtonGroup *ques1_group;
    QButtonGroup *ques2_group;
    QButtonGroup *ques3A_group;
    QButtonGroup *ques3B_group;
    QButtonGroup *ques3C_group;
    QButtonGroup *ques3D_group;

    QRadioButton *ques1a_button;
    QRadioButton *ques1b_button;
    QRadioButton *ques1c_button;
    QRadioButton *ques2a_button;
    QRadioButton *ques2b_button;
    QRadioButton *ques3Aa_button;
    QRadioButton *ques3Ab_button;
    QRadioButton *ques3Ba_button;
    QRadioButton *ques3Bb_button;
    QRadioButton *ques3Ca_button;
    QRadioButton *ques3Cb_button;
    QRadioButton *ques3Da_button;
    QRadioButton *ques3Db_button;

    QGridLayout *mainLayout;
    QGridLayout *leftLayout;
    QLabel *userName;
    QLineEdit *userNameEdit;
    QLabel *serverIPLabel;
    QLineEdit *serverIPLineEdit;
    QLabel *portLabel;
    QLineEdit *portLineEdit;
    bool status;
    int port;
    QHostAddress *serverIP;
    QTcpSocket *tcpSocket;

public slots:
    void slotEnter();
    void saveData();
    void slotConnected();
    void slotDisconnected();
    void dataReceived();
    void slotSend();
    //void newConnection();
};

#endif // QUESTCPCLIENT_H

源文件 main.cpp

#include "questcpclient.h"
#include 

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QuesTcpClient w;
    w.show();

    return a.exec();
}

源文件 questcpclient.cpp

#include "questcpclient.h"
#include 
#include 

QuesTcpClient::QuesTcpClient(QWidget *parent)
    : QDialog(parent)
{
    setWindowTitle(tr("问卷调查"));
    title_label = new QLabel(tr("颞下颌关节紊乱病（TMD）疼痛筛查表"));
    pe.setColor(QPalette::WindowText,Qt::red);
    title_label->setPalette(pe);
    ques1_label = new QLabel(tr("1. 最近30天内，任一侧的下颌或太阳穴部位的疼痛持续了多久？"));
    ques2_label = new QLabel(tr("2. 最近30天内，醒来时下颌是否感觉疼痛或僵硬？"));
    ques3_label = new QLabel(tr("3. 最近30天内，下列活动是否会改变（即缓解或加剧）任一侧的下颌或太阳穴部位疼痛状态？"));
    ques3A_label = new QLabel(tr("A. 咀嚼坚硬或韧性食物"));
    ques3B_label = new QLabel(tr("B. 张嘴，或将下颌前移或移向一侧"));
    ques3C_label = new QLabel(tr("C. 下颌习惯动作，比如将上下牙合在一起、紧咬牙、磨牙或嚼口香糖"));
    ques3D_label = new QLabel(tr("D. 其他下颌动作，比如讲话、亲吻或打哈欠"));

    save_button = new QPushButton(tr("保 存"));
    send_button = new QPushButton(tr("提 交"));
    ques1a_button = new QRadioButton(tr("a. 没有疼痛"));
    ques1b_button = new QRadioButton(tr("b. 断断续续"));
    ques1c_button = new QRadioButton(tr("c. 一直有疼痛"));
    ques2a_button = new QRadioButton(tr("a. 否"));
    ques2b_button = new QRadioButton(tr("b. 是"));
    ques3Aa_button = new QRadioButton(tr("a. 否"));
    ques3Ab_button = new QRadioButton(tr("b. 是"));
    ques3Ba_button = new QRadioButton(tr("a. 否"));
    ques3Bb_button = new QRadioButton(tr("b. 是"));
    ques3Ca_button = new QRadioButton(tr("a. 否"));
    ques3Cb_button = new QRadioButton(tr("b. 是"));
    ques3Da_button = new QRadioButton(tr("a. 否"));
    ques3Db_button = new QRadioButton(tr("b. 是"));

    ques1_group = new QButtonGroup();
    ques1_group->addButton(ques1a_button,0);
    ques1_group->addButton(ques1b_button,1);
    ques1_group->addButton(ques1c_button,2);
    ques2_group = new QButtonGroup();
    ques2_group->addButton(ques2a_button,0);
    ques2_group->addButton(ques2b_button,1);
    ques3A_group = new QButtonGroup();
    ques3A_group->addButton(ques3Aa_button,0);
    ques3A_group->addButton(ques3Ab_button,1);
    ques3B_group = new QButtonGroup();
    ques3B_group->addButton(ques3Ba_button,0);
    ques3B_group->addButton(ques3Bb_button,1);
    ques3C_group = new QButtonGroup();
    ques3C_group->addButton(ques3Ca_button,0);
    ques3C_group->addButton(ques3Cb_button,1);
    ques3D_group = new QButtonGroup();
    ques3D_group->addButton(ques3Da_button,0);
    ques3D_group->addButton(ques3Db_button,1);

    mainLayout = new QGridLayout(this);
    mainLayout->addWidget(title_label,0,0,1,2);
    mainLayout->setAlignment(title_label,Qt::AlignCenter);
    mainLayout->addWidget(send_button,3,1);
    mainLayout->addWidget(ques1_label,4,0);
    mainLayout->addWidget(ques1a_button,5,0);
    mainLayout->addWidget(ques1b_button,6,0);
    mainLayout->addWidget(ques1c_button,7,0);
    mainLayout->addWidget(ques2_label,8,0);
    mainLayout->addWidget(ques2a_button,9,0);
    mainLayout->addWidget(ques2b_button,10,0);
    mainLayout->addWidget(ques3_label,11,0);
    mainLayout->addWidget(ques3A_label,12,0);
    mainLayout->addWidget(ques3Aa_button,13,0);
    mainLayout->addWidget(ques3Ab_button,14,0);
    mainLayout->addWidget(ques3B_label,15,0);
    mainLayout->addWidget(ques3Ba_button,16,0);
    mainLayout->addWidget(ques3Bb_button,17,0);
    mainLayout->addWidget(ques3C_label,18,0);
    mainLayout->addWidget(ques3Ca_button,19,0);
    mainLayout->addWidget(ques3Cb_button,20,0);
    mainLayout->addWidget(ques3D_label,21,0);
    mainLayout->addWidget(ques3Da_button,22,0);
    mainLayout->addWidget(ques3Db_button,23,0);
    mainLayout->addWidget(save_button,24,0,1,2);
    mainLayout->setAlignment(save_button,Qt::AlignCenter);

    userName = new QLabel(tr("用户名："));
    userNameEdit = new QLineEdit(this);
    message_label = new QLabel(this);
    serverIPLabel = new QLabel(tr("服务器地址："));
    serverIPLineEdit = new QLineEdit(tr("127.0.0.1"));
    portLabel = new QLabel(tr("端口："));
    portLineEdit = new QLineEdit(tr("8010"));

    mainLayout->addWidget(userName,1,1);
    mainLayout->addWidget(userNameEdit,2,1);
    mainLayout->addWidget(message_label,25,0,1,2);
    mainLayout->setAlignment(message_label,Qt::AlignCenter);
    status = false;
    port = 8010;
    portLineEdit->setText(QString::number(port));
    serverIP = new QHostAddress();
    send_button->setEnabled(false);
    connect(send_button,SIGNAL(clicked()),this,SLOT(slotEnter()));
    connect(save_button,SIGNAL(clicked()),this,SLOT(saveData()));
    connect(send_button,SIGNAL(clicked()),this,SLOT(slotSend()));
}

QuesTcpClient::~QuesTcpClient()
{

}

void QuesTcpClient::slotEnter()
{
    if(!status)
    {
        QString ip = serverIPLineEdit->text();
        if(!serverIP->setAddress(ip))
        {
            QMessageBox::information(this,tr("error"),tr("server ip address error!"));
            return;
        }

        tcpSocket = new QTcpSocket(this);
        connect(tcpSocket,SIGNAL(connected()),this,SLOT(slotConnected()));
        connect(tcpSocket,SIGNAL(disconnected()),this,SLOT(slotDisconnected()));
        connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(dataReceived()));
        tcpSocket->connectToHost(*serverIP,port);
        status = true;
    }
}

void QuesTcpClient::slotConnected()
{
    send_button->setEnabled(true);
}

void QuesTcpClient::saveData()
{
    if (!(QMessageBox::question(this, tr("保存"), tr("是否保存选项结果？"), tr("保存"), tr("取消"))))
    {
        if(userNameEdit->text()=="")
        {
            QMessageBox::information(this,tr("错误"),tr("用户名错误！"),tr("返回"));
        }
        else
        {
            QString msg;
            qDebug() << tr("用户：") + userNameEdit->text();
            switch(ques1_group->checkedId())
            {
            case 0:
                qDebug() << tr("Q1：") + ques1a_button->text();
                break;
            case 1:
                qDebug() << tr("Q1：") + ques1b_button->text();
                break;
            case 2:
                qDebug() << tr("Q1：") + ques1c_button->text();
                break;
            }
            switch(ques2_group->checkedId())
            {
            case 0:
                qDebug() << tr("Q2：") + ques2a_button->text();
                break;
            case 1:
                qDebug() << tr("Q2：") + ques2b_button->text();
                break;
            }
            switch(ques3A_group->checkedId())
            {
            case 0:
                qDebug() << tr("Q3(A)：") + ques3Aa_button->text();
                break;
            case 1:
                qDebug() << tr("Q3(A)：") + ques3Ab_button->text();
                break;
            }
            switch(ques3B_group->checkedId())
            {
            case 0:
                qDebug() << tr("Q3(B)：") + ques3Ba_button->text();
                break;
            case 1:
                qDebug() << tr("Q3(B)：") + ques3Bb_button->text();
                break;
            }
            switch(ques3C_group->checkedId())
            {
            case 0:
                qDebug() << tr("Q3(C)：") + ques3Ca_button->text();
                break;
            case 1:
                qDebug() << tr("Q3(C)：") + ques3Cb_button->text();
                break;
            }
            switch(ques3D_group->checkedId())
            {
            case 0:
                qDebug() << tr("Q3(D)：") + ques3Da_button->text();
                break;
            case 1:
                qDebug() << tr("Q3(D)：") + ques3Db_button->text();
                break;
            }
        send_button->setEnabled(true);
        message_label->clear();
        }
    }
}

void QuesTcpClient::slotSend()
{
/*    if(userNameEdit->text()=="")
    {
        QMessageBox::information(this,tr("错误"),tr("用户名错误！"),tr("返回"));
    }
    else
    {
        QByteArray msg = tr("用户：").toLocal8Bit() + userNameEdit->text().toLocal8Bit() + tr("\n").toLocal8Bit();
        tcpSocket->write(msg);
        switch(ques1_group->checkedId())
        {
        case 0:
            msg = tr("Q1：a ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        case 1:
            msg = tr("Q1：b ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        case 2:
            msg = tr("Q1：c ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        }
        switch(ques2_group->checkedId())
        {
        case 0:
            msg = tr("Q2：a ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        case 1:
            msg = tr("Q2：b ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        }
        switch(ques3A_group->checkedId())
        {
        case 0:
            msg = tr("Q3(A)：a ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        case 1:
            msg = tr("Q3(A)：b ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        }
        switch(ques3B_group->checkedId())
        {
        case 0:
            msg = tr("Q3(B)：a ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        case 1:
            msg = tr("Q3(B)：b ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        }
        switch(ques3C_group->checkedId())
        {
        case 0:
            msg = tr("Q3(C)：a ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        case 1:
            msg = tr("Q3(C)：b ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        }
        switch(ques3D_group->checkedId())
        {
        case 0:
            msg = tr("Q3(D)：a ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        case 1:
            msg = tr("Q3(A)：b ").toLocal8Bit();
            tcpSocket->write(msg);
            break;
        }
    }*/
    if(userNameEdit->text()=="")
    {
        QMessageBox::information(this,tr("错误"),tr("用户名错误！"),tr("返回"));
    }
    else
    {
        QString msg = tr("User: ") + userNameEdit->text() + tr("\n");
        tcpSocket->write(msg.toLatin1(),msg.length());
        switch(ques1_group->checkedId())
        {
        case 0:
            msg = tr("Q1: a ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        case 1:
            msg = tr("Q1: b ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        case 2:
            msg = tr("Q1: c ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        }
        switch(ques2_group->checkedId())
        {
        case 0:
            msg = tr("Q2: a ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        case 1:
            msg = tr("Q2: b ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        }
        switch(ques3A_group->checkedId())
        {
        case 0:
            msg = tr("Q3(A): a ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        case 1:
            msg = tr("Q3(A): b ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        }
        switch(ques3B_group->checkedId())
        {
        case 0:
            msg = tr("Q3(B): a ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        case 1:
            msg = tr("Q3(B): b ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        }
        switch(ques3C_group->checkedId())
        {
        case 0:
            msg = tr("Q3(C): a ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        case 1:
            msg = tr("Q3(C): b ").toLocal8Bit();
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        }
        switch(ques3D_group->checkedId())
        {
        case 0:
            msg = tr("Q3(D): a ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        case 1:
            msg = tr("Q3(A): b ");
            tcpSocket->write(msg.toLatin1(),msg.length());
            break;
        }
    }
}

void QuesTcpClient::slotDisconnected()
{
    send_button->setEnabled(false);
}

void QuesTcpClient::dataReceived()
{   
    while(tcpSocket->bytesAvailable()>0)
    {
        QByteArray datagram;
        datagram.resize(tcpSocket->bytesAvailable());
        tcpSocket->read(datagram.data(),datagram.size());
        QString msg = QString::fromLocal8Bit(datagram.data());
        message_label->setText(msg);
    }
    send_button->setEnabled(false);
    save_button->setEnabled(true);
    userNameEdit->clear();
    ques1_group->setExclusive(false);
    ques1a_button->setChecked(false);
    ques1b_button->setChecked(false);
    ques1c_button->setChecked(false);
    ques1_group->setExclusive(true);
    ques2_group->setExclusive(false);
    ques2a_button->setChecked(false);
    ques2b_button->setChecked(false);
    ques2_group->setExclusive(true);
    ques3A_group->setExclusive(false);
    ques3Aa_button->setChecked(false);
    ques3Ab_button->setChecked(false);
    ques3B_group->setExclusive(true);
    ques3B_group->setExclusive(false);
    ques3Ba_button->setChecked(false);
    ques3Bb_button->setChecked(false);
    ques3B_group->setExclusive(true);
    ques3C_group->setExclusive(false);
    ques3Ca_button->setChecked(false);
    ques3Cb_button->setChecked(false);
    ques3C_group->setExclusive(true);
    ques3D_group->setExclusive(false);
    ques3Da_button->setChecked(false);
    ques3Db_button->setChecked(false);
    ques3D_group->setExclusive(true);
}

由于篇幅过长，服务器源代码放在下一篇。