解决的问题：

平常要存储一些临时数据，或者ini的系统参数数据，以下是源码解析

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如何实现：

实现的UI如下

主要功能：

初始化：

m_settings = new QSettings("DParamSetting.ini", QSettings::IniFormat);

设置值

    m_settings->beginGroup(QString("%1").arg(groupName));
    m_settings->setValue("t1Value", dParam.t1Value);
    m_settings->endGroup();

取值
   dParam.t1Value = m_settings->value(QString("%1/%2").arg(groupName).arg("t1Value")).toInt();

---

代码块解析：

.h文件

#ifndef DPARAMSETTING_H
#define DPARAMSETTING_H

#include <QWidget>
#include <QComboBox>
#include <QPushButton>
#include <QLineEdit>
#include <QSettings>

typedef struct
{
    int t1Value;
    int t2Value;
    int t3Value;
    int frequency1Value;
    int frequency2Value;
    int amplitude1Value;
    int amplitude2Value;
    int numDropValue;
}DropletParam;

class DParamSetting : public QWidget
{
    Q_OBJECT

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

private:
    void initObject();
    void initGeometry();
    void initConnect();

    void readDParams(const QString groupName, DropletParam &dParam);
    void writeDParams(const QString groupName, const DropletParam dParam);

    DropletParam assemblingDatagram();
    void displayDatagram(const DropletParam dParam);

private slots:
    void onSaveBtnClicked();
    void onCancelBtnClicked();
    void onStartBtnClicked();
    void onSourBoardChaned(const QString &str);

private:
    QComboBox *m_pSourBoardCb;  
    QPushButton *m_pT1Btn;
    QPushButton *m_pT2Btn;
    QPushButton *m_pT3Btn;
    QPushButton *m_pFr1Btn;
    QPushButton *m_pFr2Btn;
    QPushButton *m_pAmp1Btn;
    QPushButton *m_pAmp2Btn;
    QPushButton *m_pNumberBtn;

    QLineEdit *m_pT1Edit;
    QLineEdit *m_pT2Edit;
    QLineEdit *m_pT3Edit;
    QLineEdit *m_pFr1Edit;
    QLineEdit *m_pFr2Edit;
    QLineEdit *m_pAmp1Edit;
    QLineEdit *m_pAmp2Edit;
    QLineEdit *m_pNumberEdit;

    QPushButton *m_pSaveBtn;
    QPushButton *m_pStartBtn;
    QPushButton *m_pCancelBtn;
    QSettings *m_settings;
};

#endif // DPARAMSETTING_H

.cpp文件

#include "dparamsetting.h"
#include <QGridLayout>
#include <QDebug>

DParamSetting::DParamSetting(QWidget *parent)
    : QWidget(parent)
{
    initObject();
    initGeometry();
    initConnect();
}

DParamSetting::~DParamSetting()
{
    delete m_settings;
}

void DParamSetting::initObject()
{
    m_pSourBoardCb = new QComboBox(this); 

    QStringList strlist;
    strlist.append("abc");
    strlist.append("aba");
    m_pSourBoardCb->addItems(strlist);

    m_pT1Btn = new QPushButton("T1", this);
    m_pT2Btn = new QPushButton("T2", this);
    m_pT3Btn = new QPushButton("T3", this);
    m_pFr1Btn = new QPushButton("Fre1", this);
    m_pFr2Btn = new QPushButton("Fre2", this);
    m_pAmp1Btn = new QPushButton("Amp1", this);
    m_pAmp2Btn = new QPushButton("Amp2", this);
    m_pNumberBtn = new QPushButton("Number", this);

    m_pT1Edit = new QLineEdit("0", this);
    m_pT2Edit = new QLineEdit("0", this);
    m_pT3Edit = new QLineEdit("0", this);
    m_pFr1Edit = new QLineEdit("0", this);
    m_pFr2Edit = new QLineEdit("0", this);
    m_pAmp1Edit = new QLineEdit("0", this);
    m_pAmp2Edit = new QLineEdit("0", this);
    m_pNumberEdit = new QLineEdit("0", this);

    m_pSaveBtn = new QPushButton("Save", this);
    m_pStartBtn = new QPushButton("Start", this);
    m_pCancelBtn = new QPushButton("Cancel", this);

    m_settings = new QSettings("DParamSetting.ini", QSettings::IniFormat);

}

void DParamSetting::initGeometry()
{
    QGridLayout *glayout = new QGridLayout(this);

    glayout->addWidget(m_pSourBoardCb, 1, 1, 1, 2, Qt::AlignLeft);
    glayout->addWidget(m_pT1Btn, 2, 1, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pT1Edit, 2, 2, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pFr1Btn, 2, 3, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pFr1Edit, 2, 4, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pAmp1Btn, 2, 5, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pAmp1Edit, 2, 6, 1, 1, Qt::AlignCenter);

    glayout->addWidget(m_pT2Btn, 3, 1, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pT2Edit, 3, 2, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pFr2Btn, 3, 3, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pFr2Edit, 3, 4, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pAmp2Btn, 3, 5, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pAmp2Edit, 3, 6, 1, 1, Qt::AlignCenter);

    glayout->addWidget(m_pT3Btn, 4, 1, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pT3Edit, 4, 2, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pNumberBtn, 4, 3, 1, 1, Qt::AlignCenter);
    glayout->addWidget(m_pNumberEdit, 4, 4, 1, 1, Qt::AlignCenter);

    glayout->addWidget(m_pStartBtn, 5, 4, 1, 1, Qt::AlignRight);
    glayout->addWidget(m_pSaveBtn, 5, 5, 1, 1, Qt::AlignRight);
    glayout->addWidget(m_pCancelBtn, 5, 6, 1, 1, Qt::AlignLeft);

    this->setLayout(glayout);
}

void DParamSetting::initConnect()
{
    connect(m_pSaveBtn, &QPushButton::clicked, this, &DParamSetting::onSaveBtnClicked);
    connect(m_pCancelBtn, &QPushButton::clicked, this, &DParamSetting::onCancelBtnClicked);
    connect(m_pSourBoardCb, &QComboBox::currentTextChanged, this, &DParamSetting::onSourBoardChaned);
}

void DParamSetting::readDParams(const QString groupName, DropletParam &dParam)
{
    dParam.t1Value = m_settings->value(QString("%1/%2").arg(groupName).arg("t1Value")).toInt();
    dParam.t2Value = m_settings->value(QString("%1/%2").arg(groupName).arg("t2Value")).toInt();
    dParam.t3Value = m_settings->value(QString("%1/%2").arg(groupName).arg("t3Value")).toInt();
    dParam.frequency1Value = m_settings->value(QString("%1/%2").arg(groupName).arg("frequency1Value")).toInt();
    dParam.frequency2Value = m_settings->value(QString("%1/%2").arg(groupName).arg("frequency2Value")).toInt();
    dParam.amplitude1Value = m_settings->value(QString("%1/%2").arg(groupName).arg("amplitude1Value")).toInt();
    dParam.amplitude2Value = m_settings->value(QString("%1/%2").arg(groupName).arg("amplitude2Value")).toInt();
    dParam.numDropValue = m_settings->value(QString("%1/%2").arg(groupName).arg("numDropValue")).toInt();
}

void DParamSetting::writeDParams(const QString groupName, const DropletParam dParam)
{
    m_settings->beginGroup(QString("%1").arg(groupName));
    m_settings->setValue("t1Value", dParam.t1Value);
    m_settings->setValue("t2Value", dParam.t2Value);
    m_settings->setValue("t3Value", dParam.t3Value);
    m_settings->setValue("frequency1Value", dParam.frequency1Value);
    m_settings->setValue("frequency2Value", dParam.frequency2Value);
    m_settings->setValue("amplitude1Value", dParam.amplitude1Value);
    m_settings->setValue("amplitude2Value", dParam.amplitude2Value);
    m_settings->setValue("numDropValue", dParam.numDropValue);
    m_settings->endGroup();
}

DropletParam DParamSetting::assemblingDatagram()
{
    DropletParam ts;
    ts.t1Value = m_pT1Edit->text().toInt();
    ts.t2Value = m_pT2Edit->text().toInt();
    ts.t3Value = m_pT3Edit->text().toInt();
    ts.frequency1Value = m_pFr1Edit->text().toInt();
    ts.frequency2Value = m_pFr2Edit->text().toInt();
    ts.amplitude1Value = m_pAmp1Edit->text().toInt();
    ts.amplitude2Value = m_pAmp2Edit->text().toInt();
    ts.numDropValue = m_pNumberEdit->text().toInt();
    return ts;

}

void DParamSetting::displayDatagram(const DropletParam dParam)
{
    m_pT1Edit->setText(QString::number(dParam.t1Value));
    m_pT2Edit->setText(QString::number(dParam.t2Value));
    m_pT3Edit->setText(QString::number(dParam.t3Value));
    m_pFr1Edit->setText(QString::number(dParam.frequency1Value));
    m_pFr2Edit->setText(QString::number(dParam.frequency2Value));
    m_pAmp1Edit->setText(QString::number(dParam.amplitude1Value));
    m_pAmp2Edit->setText(QString::number(dParam.amplitude2Value));
    m_pNumberEdit->setText(QString::number(dParam.numDropValue));
}

void DParamSetting::onSaveBtnClicked()
{
    writeDParams(m_pSourBoardCb->currentText(), assemblingDatagram());
}

void DParamSetting::onCancelBtnClicked()
{
    DropletParam ts;
    readDParams(m_pSourBoardCb->currentText(), ts);
    displayDatagram(ts);
}

void DParamSetting::onStartBtnClicked()
{

}

void DParamSetting::onSourBoardChaned(const QString &str)
{
    DropletParam ts;
    readDParams(str, ts);
    displayDatagram(ts);
}