C++ && QT 读取配置文件的数值并将得到结果写入配置文件

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本文介绍了一个C++程序中如何使用QSettings类来读取和写入配置文件的具体实现。通过示例代码，详细展示了如何从配置文件中读取参数并显示，以及如何将界面输入的参数写回配置文件的过程。

 // 读取配置文件，并显示出来，初始化

void Calibrati0n_Method::Para_initial()  
{
	QString fileName;
	fileName = QCoreApplication::applicationDirPath();
	fileName += "/cfg/SetConfigPara.ini";
	QSettings settingcfg(fileName, QSettings::IniFormat);

	double R, Step, CC_DX, CC_DY, LaserX, LaserY;

	CC_DX = settingcfg.value("Position/CCD_X").toDouble();
	CC_DY = settingcfg.value("Position/CCD_Y").toDouble();

	LaserX = settingcfg.value("Position/Laser_X").toDouble();
	LaserY = settingcfg.value("Position/Laser_Y").toDouble();

	R = settingcfg.value("Position/Radius").toDouble();
	Step = settingcfg.value("Position/LaserStep").toDouble();

	ui.lineEdit_CCD_X->setText(QString::number(CC_DX));
	ui.lineEdit_CCD_Y->setText(QString::number(CC_DY));
	ui.lineEdit_Laser_X->setText(QString::number(LaserX));
	ui.lineEdit_Laser_Y->setText(QString::number(LaserY));
	ui.lineEdit_Rad->setText(QString::number(R));
	ui.lineEdit_step->setText(QString::number(Step));

}



// 将参数写入配置文件

void Calibrati0n_Method::Write_Pal() 
{

	// 保存输入的数据到配置文件
	QString fileName;
	fileName = QCoreApplication::applicationDirPath();
	fileName += "/cfg/SetConfigPara.ini";
	QSettings settings(fileName, QSettings::IniFormat);
	

	double CCD_X=0.0, CCD_Y=0.0, Laser_X=0.0, Laser_Y=0.0, Radius_r=0.0, LaserStep_Step=0.0;

	// 获取文本当前数据
	CCD_X = ui.lineEdit_CCD_X->text().toDouble();
	CCD_Y = ui.lineEdit_CCD_Y->text().toDouble();
	Laser_X = ui.lineEdit_Laser_X->text().toDouble();
	Laser_Y = ui.lineEdit_Laser_Y->text().toDouble();;
	Radius_r = ui.lineEdit_Rad->text().toDouble();;
	LaserStep_Step = ui.lineEdit_step->text().toDouble();;

	// 保存文本当前数据
	settings.setValue("Position/CCD_X", CCD_X);
	settings.setValue("Position/CCD_Y", CCD_Y);

	settings.setValue("Position/Laser_X", Laser_X);
	settings.setValue("Position/Laser_Y", Laser_Y);

	settings.setValue("Position/Radius", Radius_r);
	settings.setValue("Position/LaserStep", LaserStep_Step);


	QMessageBox::warning(this, "", QStringLiteral("参数更新成功"));
	
}