Qt 5 code showing how to use Linguist and how to install user defined font

using QFontdatabase and QFont we can use font that is not install on our system on a Qt5 application, we simply load the font using QFile and add it font database. 

//linguistic.pro
QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TRANSLATIONS = amharic_ln.ts

TARGET = linguistic

TEMPLATE = app

SOURCES += main.cpp\

        dialog.cpp

HEADERS  += dialog.h

FORMS    += dialog.ui

CODECFORTR = UTF-8

//main.cpp
#include "dialog.h"

#include <QApplication>

#include <QTranslator>

#include <QFont>

#include <QFontDatabase>

#include <QFile>

#include <QDebug>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    QFile res("C:/Documents and Settings/user/My Documents/Qt Projects/linguistic/gfzemen.ttf");

    res.open(QIODevice::ReadOnly);

    QFontDatabase fdata;

    fdata.addApplicationFontFromData(res.readAll());

    Dialog w;

    QFont f("GF Zemen Unicode");

    f.setPointSize(12);

    w.setFont(f);

    w.show();

    return a.exec();

}

//dialog.h

#ifndef DIALOG_H
#define DIALOG_H

 
#include <QDialog>
#include <QTranslator>
#include <QDebug>
#include <QDir>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT
    
public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
    
private:
    Ui::Dialog *ui;
    QApplication *tapp;
    QTranslator translate;
    QString file;
};

#endif // DIALOG_H

//dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent):  QDialog(parent), ui(new Ui::Dialog)
{
    translate.load("C:/Documents and Settings/user/My Documents/Qt Projects/linguistic/amharic_ln.qm");
    tapp->installTranslator(&translate);

    ui->setupUi(this);
}

Dialog::~Dialog()
{
    delete ui;
}