QT中如何读写ini配置文件

//初始化一个.ini配置文件
 //qApp是QT系统自带的,可以直接使用
QString iniFilePath=qApp->applicationDirPath()+"/Config.ini";
//如果不存在Config.ini，便生成一个Config.ini。如果已经存在了，则略过。
if(!QFile::exists(iniFilePath))
{
     QSettings configIniWrite(iniFilePath,QSettings::IniFormat);
     configIniWrite.beginGroup("calib_data_path");
     configIniWrite.setValue("calib_data_path","FA0180090134.xml");
     configIniWrite.endGroup();
     configIniWrite.beginGroup("robot_pose_file");
     configIniWrite.setValue("robot_pose_file_path","robot_pose_file.txt");
     configIniWrite.endGroup();
}

void saveConfig(const QString& group,const QString& name, const QVariant& var)
{
     QString iniFilePath = qApp->applicationDirPath() + "/Config.ini";
     if (QFile::exists(iniFilePath))
     {
	   QSettings configIniWrite(iniFilePath,QSettings::IniFormat);
	   configIniWrite.beginGroup(group);
	   configIniWrite.setValue(name,var);
           configIniWrite.endGroup();
     }
}

  //设置相机标定文件路径
void CalibrationForm::btnLoadCamParaPath_clicked()
{
	QFileDialog dialog(this,tr("Select calib data file"));
	dialog.setAcceptMode(QFileDialog::AcceptOpen);
	dialog.setFileMode(QFileDialog::ExistingFile);
	static bool firstDialog = true;
	if (firstDialog)
	{
		firstDialog = false;
		const QStringList fileLocations = 
                QStandardPaths::standardLocations(QStandardPaths::DesktopLocation);
		dialog.setDirectory(fileLocations.isEmpty() ?          
                QDir::currentPath():fileLocations.last());
	}
	dialog.setNameFilter(tr("FA0180090134(*.xml)"));
	if (dialog.exec()==QDialog::Accepted)
	{
		//获得文件夹路径+文件名
		_campara_path = dialog.selectedFiles().first();
		ui->lineEditCamParaPath->setText(_campara_path); //此处是在lineEdit窗口显示路径名+文件名
		saveConfig("calib_data_path","calib_data_path",_campara_path);
	}
}

 //设置手眼标定时的机械臂运动轨迹路径
void CalibrationForm::btnLoadRobotPara_clicked()
{
	QFileDialog dialog(this,tr("Select robot pose file"));
	dialog.setAcceptMode(QFileDialog::AcceptOpen);
	dialog.setFileMode(QFileDialog::ExistingFile);
	static bool first_Dialog = true;
	if (first_Dialog)
	{
		first_Dialog = false;
		const QStringList fileLocations = 
QStandardPaths::standardLocations(QStandardPaths::DesktopLocation);
		dialog.setDirectory(fileLocations.isEmpty()?
QDir::currentPath():fileLocations.last());
	}
	dialog.setNameFilter(tr("robot_pose_file(*.txt)"));
	if (dialog.exec()==QDialog::Accepted)
	{
		_robot_pose_path = dialog.selectedFiles().first();
		ui->lineEditRobotPath->setText(_robot_pose_path);
		saveConfig("robot_pose_file","robot_pose_file_path",_robot_pose_path);
	}
}