Some questions on porting apps to Window$

[jiveaxe]

Hi everybody,
new day new questions; cause some people are yet using gates' OS i am porting my application to this; since my application is 100% QT4.3 dipendent I have downloaded QT/Windows Open Source Edition (self-extracting installer).

Then I have recompiled my source; from my experience here are my questions:

1. Who explains me this strange behaviour?
   The folloeing code:
   

   #include <QtGui>
   #include <QSqlDatabase>
   #include "maindialog.h"
    
   QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    
   MainDialog::MainDialog(QWidget *parent)
   	:QDialog(parent)
   {
   	...
   	if(!createConnection())
   		return;
   	...
   }
    
   bool MainDialog::createConnection()
   {
       db.setDatabaseName(QApplication::applicationDirPath() + "/gmc_db");
       if (!db.open()) {
           QMessageBox::critical(0, qApp->tr("Cannot open database"),
               qApp->tr("Unable to establish a database connection.\n"
                        "This program needs SQLite support. Please read "
                        "the Qt SQL driver documentation for information how "
                        "to build it.\n\n"
                        "Click Cancel to exit."), QMessageBox::Cancel);
           return false;
       }
       return true;
   }

   #include <QtGui>
   #include <QSqlDatabase>
   #include "maindialog.h"
   
   QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
   
   MainDialog::MainDialog(QWidget *parent)
   	:QDialog(parent)
   {
   	...
   	if(!createConnection())
   		return;
   	...
   }
   
   bool MainDialog::createConnection()
   {
       db.setDatabaseName(QApplication::applicationDirPath() + "/gmc_db");
       if (!db.open()) {
           QMessageBox::critical(0, qApp->tr("Cannot open database"),
               qApp->tr("Unable to establish a database connection.\n"
                        "This program needs SQLite support. Please read "
                        "the Qt SQL driver documentation for information how "
                        "to build it.\n\n"
                        "Click Cancel to exit."), QMessageBox::Cancel);
           return false;
       }
       return true;
   }

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   gives error during execution on db.open() (as it can't find the database file, while it exist and is in the same directory as the exe).
   
   If I move, instead, the row
   
   

   QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");

   QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");

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   in createConnection() function it works good (in linux works in both situations).
   
2. The aspect of the text in the windows version is worst than in linux; it appears bigger and aliased; why? Is related to windows itself or to qt libraries?
   
   If I have this code:
   
   

   QFont Strings::totalscoreFont()
   {
   	QFont font;
   	font.setStyleStrategy(QFont::PreferAntialias);
   	font.setStyleStrategy(QFont::ForceOutline);
   	font.setPixelSize(60);
   	font.setBold(true);
   	font.setFamily("Monofonto");
    
   	return font;
   }

   QFont Strings::totalscoreFont()
   {
   	QFont font;
   	font.setStyleStrategy(QFont::PreferAntialias);
   	font.setStyleStrategy(QFont::ForceOutline);
   	font.setPixelSize(60);
   	font.setBold(true);
   	font.setFamily("Monofonto");
   
   	return font;
   }

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   How can i change it so during compilation under windows it uses different fontfamily and size?
   
3. If i want give the compiled exe to my friends they need qt4.3 installed, doesn't they? Or can I include some qt's dll with my code (my application will be licensed under GPL).

Thanks for helping me,