I'm trying to open a file to my texteditor and I want to change and save it but it gives me that error
QFSFileEngine::open: No file name specified

mainwindow.cpp
Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3. #include <QWidget>
  4. #include <QFileDialog>
  5. #include <QFile>
  6. #include <QFileInfo>
  7.  
  8.  
  9. MainWindow::MainWindow(QWidget *parent) :
  10.     QMainWindow(parent),
  11.     ui(new Ui::MainWindow)
  12. {
  13.     ui->setupUi(this);
  14.  
  15. }
  16.  
  17. MainWindow::~MainWindow()
  18. {
  19.     delete ui;
  20. }
  21.  
  22. void MainWindow::on_actionOpen_triggered()
  23. {
  24.     QString file = QFileDialog::getOpenFileName(this);  //this is open function
  25.  
  26.     if(!file.isEmpty())
  27.     {
  28.  
  29.         nFile.setFileName (file);
  30.         if(nFile.open (QFile::ReadOnly | QFile::Text))
  31.         {
  32.             nFile.fileName ()=file;
  33.             QTextStream in(&nFile);
  34.             QString text = in.readAll ();
  35.             nFile.close();
  36.  
  37.             ui->textEdit->setPlainText (text);
  38.  
  39.  
  40.         }
  41.     }
  42. }
  43.  
  44. void MainWindow::on_actionSave_triggered()   //this is save function
  45.  
  46. {
  47.     //QString file;                     //I tried to fix the problem with these parts
  48.     //nFile.setFileName (file);
  49.     if(nFile.open (QFile::WriteOnly | QFile::Text))  
  50.     {
  51.         QTextStream out(&nFile);
  52.         out << ui->textEdit->toPlainText ();
  53.  
  54.         nFile.flush();
  55.         nFile.close();
  56.  
  57.     }
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