QT实现记录上一次用户名和密码功能

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说明：在登录时，为了避免每次打开软件都要重新输入账号和密码，可以用QSettings来实现记录功能。

本例子中记录的是ip和port号。

#ifndef PERFORMANCETESTING_H#define PERFORMANCETESTING_H#include <QtWidgets/QMainWindow>#include "ui_performancetesting.h"class PerformanceTesting : public QMainWindow{Q_OBJECTpublic:PerformanceTesting(QWidget *parent = 0);~PerformanceTesting();private slots:void PushButton();void WriteInit(QString key, QString value);void ReadInit(QString key, QString &value);private:Ui::PerformanceTestingClass ui;};#endif // PERFORMANCETESTING_H

#include "performancetesting.h"#include "handlethreadandtest.h"#include <QDebug>#include <QMessageBox>#include <QSettings>PerformanceTesting::PerformanceTesting(QWidget *parent): QMainWindow(parent){ui.setupUi(this);QString readIP;QString readPort;ReadInit("IP", readIP);ReadInit("PORT", readPort);ui.serverIP->setText(readIP);ui.serverPort->setText(readPort);}PerformanceTesting::~PerformanceTesting(){}void PerformanceTesting::PushButton(){if (ui.serverIP->text() == "" || ui.serverPort->text() == ""){QMessageBox::information(this, "Warning", "IP and port number can not be empty!", QMessageBox::Ok);return;}WriteInit("IP", ui.serverIP->text());WriteInit("PORT", ui.serverPort->text());QString ip = ui.serverIP->text();int port = ui.serverPort->text().toInt();int meetingRoomNum = ui.meetingRoomNum->text().toInt();int peopleNum = ui.peopleNum->text().toInt();HandleThreadAndTest *threadAndTest = new HandleThreadAndTest();threadAndTest->SetIP(ip);threadAndTest->SetPort(port);threadAndTest->SetMeetingRoomNum(meetingRoomNum);threadAndTest->SetPeopleNum(peopleNum);this->close();threadAndTest->show();}void PerformanceTesting::WriteInit(QString key, QString value){QString path = "ip.ini";//创建配置文件操作对象QSettings *config = new QSettings(path, QSettings::IniFormat);//将信息写入配置文件config->beginGroup("config");config->setValue(key, value);config->endGroup();delete config;}void PerformanceTesting::ReadInit(QString key, QString &value){value = QString("");QString path = "ip.ini";//创建配置文件操作对象QSettings *config = new QSettings(path, QSettings::IniFormat);//读取配置信息value = config->value(QString("config/") + key).toString();delete config;}

第二次运行时，就会填入第一次输入的ip和port。

//参考：http://blog.sina.com.cn/s/blog_a6fb6cc90101bz3c.htmlbool Util::writeInit(QString path, QString user_key, QString user_value){if (path.isEmpty() || user_key.isEmpty()){return false;}else{//创建配置文件操作对象QSettings *config = new QSettings(path, QSettings::IniFormat);//将信息写入配置文件config->beginGroup("config");config->setValue(user_key, user_value);config->endGroup();return true;}}bool Util::readInit(QString path, QString user_key, QString &user_value){user_value = QString("");if (path.isEmpty() || user_key.isEmpty()){return false;}else{//创建配置文件操作对象QSettings *config = new QSettings(path, QSettings::IniFormat);//读取用户配置信息user_value = config->value(QString("config/") + user_key).toString();return true;}}//获取界面用户输入的配置内容QString address = address_line_edit->text();  //地址QString port = port_line_edit->text();  //端口向user.ini配置文件中写入地址、端口bool is_address = Util::writeInit(QString("./user.ini"), ADDRESS, address);bool is_port = Util::writeInit(QString("./user.ini"), PORT, port);从user.ini配置文件中读取地址、端口QString address_value;QString port_value;bool is_address = Util::readInit(QString("./user.ini"), ADDRESS, address_value);bool is_port = Util::readInit(QString("./user.ini"), PORT, port_value);

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