Hello, i have a problem with reading my map data or possibly even writing it in.

the app i'm making is a basic currency converter.

I download the exchange rates from a website, save it into txt file, which i then parse to save the values into a map and use my calculator class to do the conversion.

the downloader class works flawless (i got it of offical QT forums) so i wont post it since the problem aint there.

the code: main.cpp

Qt Code: 
  1. int main(int argc, char *argv[])
  2.     {
  3.         QApplication a(argc, argv);
  4.  
  5.         QMap<QString,double> currency_map;
  6.  
  7.         downloader d;
  8.         d.Do_download();
  9.  
  10.     	parser p;
  11.         p.read_line(currency_map);
  12.  
  13.         p.print_map(currency_map);// this line works, and it prints out the map
  14.  
  15.         MainWindow w(currency_map);
  16.         w.show();
  17.  
  18.         return a.exec();
  19.     };
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parser.cpp
im pretty sure it works well because the print_map function does its job.

Qt Code: 
  1. void parser::process_line(QString line, QMap<QString, double> &my_map)
  2.     {
  3.  
  4.         QStringList temporary_list;
  5.  
  6.         for(int i = 0; i< currency_list.size();i++)
  7.             {
  8.             if(line.contains(currency_list.at(i),Qt::CaseInsensitive))
  9.                 {
  10.  
  11.                 temporary_list=line.split(" ",QString::SkipEmptyParts);
  12.  
  13.                 temporary_list.replaceInStrings(",",".");
  14.                 my_map.insert(currency_list.at(i),temporary_list[6].toDouble());
  15.             }
  16.         }
  17.  
  18.     }
  19.  
  20.     int parser::read_line(QMap<QString, double> &my_map)
  21.     {
  22.  
  23.         QFile file("C:/Qt/test/downloaded.txt");
  24.  
  25.         if(!file.exists())
  26.             {
  27.             QMessageBox msgBox;
  28.             msgBox.setText("There is no such file");
  29.             msgBox.exec();
  30.             return 1;
  31.         }    
  32.         if(!file.open(QIODevice::ReadOnly  | QIODevice::Text))
  33.         {
  34.             QMessageBox msgBox;
  35.             msgBox.setText("Error while opening file");
  36.             msgBox.exec();
  37.             return 1;
  38.         }
  39.  
  40.         QTextStream in_stream(&file);
  41.         QString line=in_stream.readLine();
  42.  
  43.         while (!line.isNull())
  44.             {
  45.             process_line(line, my_map);
  46.             line = in_stream.readLine();
  47.         }
  48.         return 0;
  49.     }
  50.  
  51.     void parser::print_map(QMap<QString, double> &my_map)
  52.     {
  53.        QMapIterator<QString, double> i(my_map);
  54.         while(i.hasNext())
  55.             {
  56.             i.next();
  57.             qDebug()<< i.key() << ": " << i.value();
  58.         }   
  59.     }
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now i have a calculator class :

.h

Qt Code: 
  1. class Calculator
  2.     {
  3.     public:
  4.         explicit Calculator(QMap<QString,double> &currency_map);
  5.     	void multiply();
  6.     	void getValues(QString strFrom, QString strTo);
  7.     	double getTotal();
  8.     private:
  9.     	double total, firstCurr, secondCurr;
  10.     	QMap<QString,double> &map;
  11.  
  12.     };
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.cpp

Qt Code: 
  1. #include "calculator.h"
  2.  
  3.     Calculator::Calculator(QMap<QString,double> &currency_map):map(currency_map)
  4.     {
  5.     	total = 0;
  6.     	firstCurr = 0;
  7.     	secondCurr= 0;
  8.     }
  9.  
  10.     void Calculator::getValues(QString strFrom, QString strTo)
  11.     {
  12.     	QMap<QString, double>::iterator i;
  13.     	for(i=map.begin();i!=map.end();i++);
  14.             {
  15.  
  16.     			if(!i.key().compare(strFrom))
  17.     				firstCurr=i.value();
  18.     			if(!i.key().compare(strFrom))
  19.     				secondCurr = i.value();
  20.         }
  21.     		//firstCurr = 2;
  22.     		//secondCurr = 3;
  23.     }
  24.  
  25.     void Calculator::multiply()
  26.     {
  27.     	total = firstCurr * secondCurr;
  28.     }
  29.  
  30.     double Calculator::getTotal()
  31.     {
  32.     	return total;
  33.     }
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then i create a Calculator object in my mainWindow class
.h

Qt Code: 
  1. class MainWindow : public QMainWindow
  2.         {
  3.             Q_OBJECT
  4.  
  5.         public:
  6.             explicit MainWindow(QMap<QString,double> &currency_map, QWidget *parent = 0);
  7.  
  8.             ~MainWindow();
  9.  
  10.  
  11.         private slots:
  12.             void on_convert_button_clicked();
  13.  
  14.         private:
  15.             Ui::MainWindow *ui;
  16.         	Calculator calc;
  17.  
  18.         };
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.cpp

Qt Code: 
  1. MainWindow::MainWindow(QMap<QString, double> &currency_map, QWidget *parent) :
  2.         QMainWindow(parent),
  3.         ui(new Ui::MainWindow),calc(currency_map)
  4.     {
  5.         ui->setupUi(this);
  6.     }
  7.  
  8.     MainWindow::~MainWindow()
  9.     {
  10.         delete ui;
  11.     }
  12.  
  13.     void MainWindow::on_convert_button_clicked()
  14.     {
  15.     	calc.getValues(ui->from_Combox->currentText(),ui->to_Combox->currentText());
  16.     	calc.multiply();
  17.     	ui->lcdNumber->display(calc.getTotal());
  18.     }
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but i cant seem to get any values from the map.
the wierd thing also is when i debugg(i use visual studio, have some trouble setting up a debbuger in QT Creator) its always shows the map as empty, which i cant grasp since the print function works.

any help would be appreciated. thx