I. Introduction to the environment

Qt: 5.12.6

Operating system: Win10 (64-bit)

Ii. Introduction of software effects and functions

Function: Domain name resolution (domain name to IP address)

Core code

3.1 the widget. The CPP

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
}

Widget::~Widget()
{
    delete ui;
}

/* Engineering: SmartHome Date: 2021-04-26 author: DS Small Long ge environment: Win10 QT5.12.6 MinGW32 function: log display */
void Widget::Log_Text_Display(QString text)
{
    QPlainTextEdit *plainTextEdit_log=ui->plainTextEdit_log;
    // Set the cursor to the end of the text
    plainTextEdit_log->moveCursor(QTextCursor::End, QTextCursor::MoveAnchor);
    // When the number of texts exceeds a certain range, it is cleared
    if(plainTextEdit_log->toPlainText().size(a) >1024*4)
    {
        plainTextEdit_log->clear(a); } plainTextEdit_log->insertPlainText(text);
    // Move the scroll bar to the bottom
    QScrollBar *scrollbar = plainTextEdit_log->verticalScrollBar(a);if(scrollbar)
    {
        scrollbar->setSliderPosition(scrollbar->maximum()); }}// When the domain name is successfully resolved, the lookedUp slot function is called
void Widget::lookedUp(const QHostInfo &host)
{
    if (host.error() != QHostInfo::NoError) {
        Log_Text_Display(host.errorString() +"\n");
        return;
    }


    foreach (QHostAddress address, host.addresses())
    {
        Log_Text_Display(address.toString() +"\n"); }}/* Project: IP_Addr_Analysis Date: 2021-06-01 Author: DS xiaolonggui environment: Win10 QT5.12.6 MinGW32 function: domain name parsing */
void Widget::on_pushButton_ip_get_clicked(a)
{
     // Call nslookup to resolve the domain name, and then call QHostInfo to resolve some domain names.
     // The reason for using QHostInfo is that it is too lazy to parse the string, so the QHostInfo signal reads the IP address directly.
     QProcess process;
     process.start(QString("nslookup %1").arg(ui->lineEdit_ip_name->text()));
     process.waitForFinished(5000);
     Log_Text_Display(process.readAll() +"\n");
     QHostInfo::lookupHost(ui->lineEdit_ip_name->text(),this.SLOT(lookedUp(QHostInfo)));
}

/* Engineering: IP_Addr_Analysis Date: 2021-06-01 author: DS xiaolonggui environment: Win10 QT5.12.6 MinGW32 function: clear data */
void Widget::on_pushButton_clean_clicked(a)
{
    ui->plainTextEdit_log->clear(a); }Copy the code

3.2 widget. H

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QHostInfo>
#include <QScrollBar>
#include <QPlainTextEdit>
#include <QProcess>
QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget(a);private slots:
    void lookedUp(const QHostInfo &host);
    void Log_Text_Display(QString text);
    void on_pushButton_ip_get_clicked(a);

    void on_pushButton_clean_clicked(a);

private:
    Ui::Widget *ui;
};
#endif // WIDGET_H
Copy the code