Qt设计：登陆界面（QSetting）

实现效果，勾选记住密码获取lineEdit的值并保存

源程序

mymainwindow.cpp

#include "mymainwindow.h"
#include "ui_mymainwindow.h"
#include <QString>
#include <QMessageBox>
#include <QSettings>
myMainWindow::myMainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::myMainWindow)
{
    ui->setupUi(this);

    QSettings setting("C:/Window/config.ini",QSettings::IniFormat);//读配置文件

    str_3=setting.value("Login/account").toString();

    ui->lineEdit->setText(str_3);

    str_4=setting.value("Login/password").toString();

    ui->lineEdit_2->setText(str_4);

    ui->checkBox->setChecked(true);
}

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

void myMainWindow::on_lineEdit_2_textChanged(const QString &arg1)
{
    ui->lineEdit_2->setEchoMode(QLineEdit::Password);
}

void myMainWindow::on_pushButton_clicked()
{
    str_1 = ui->lineEdit->text();
    str_2 = ui->lineEdit_2->text();

    QSettings setting("C:/Window/config.ini",QSettings::IniFormat);//读配置文件

    if(str_1 == "" || str_2 == "")
    {
        QMessageBox::information(this, "错误！", "用户名或者密码不能为空！", QMessageBox::Ok);
               return;
    }

    else if(str_1==str_3&&str_2==str_4)
    {
        close();
    }

    else if(str_1==str_3&&str_2!=str_4)
    {
        QMessageBox::information(this, "错误！", "您输入的密码有误！", QMessageBox::Ok);

        return;
    }


    void on_checkBox_clicked();

}

void myMainWindow::on_pushButton_2_clicked()
{
    close();
}
void myMainWindow::on_checkBox_clicked()
{

}

void myMainWindow::on_checkBox_stateChanged(int arg1)
{
    if(arg1=ui->checkBox->isChecked())
       {
           remeberPasswd=true;

           str_1 = ui->lineEdit->text();

           str_2 = ui->lineEdit_2->text();


            QSettings setting("C:/Window/config.ini",QSettings::IniFormat);//读配置文件

            setting.beginGroup(tr("Login"));

                setting.setValue("account",str_1);//设置key和value，也就是参数和值

                setting.setValue("password",str_2);

                setting.setValue("remeber",true);

            setting.endGroup();//节点结束
       }
    else
       {
           ui->lineEdit_2->clear();

            remeberPasswd=false;
       }
}

//main.cpp

#include "mymainwindow.h"
#include <QApplication>

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

    return a.exec();
}

//mymainwindow.h

#ifndef MYMAINWINDOW_H
#define MYMAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class myMainWindow;
}

class myMainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit myMainWindow(QWidget *parent = 0);
    ~myMainWindow();

    QString str_1,str_2,str_3,str_4;

    QString RemeberPasswd;
    bool remeberPasswd,r;
private slots:
    void on_lineEdit_2_textChanged(const QString &arg1);

    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

    void on_checkBox_clicked();

    void on_checkBox_stateChanged(int arg1);

private:
    Ui::myMainWindow *ui;


};

#endif // MYMAINWINDOW_H