Open File Dialog Help

[ars]

What about reading QFile documentation and your compiler error messages?

Here´s some more or less pseudo code for your open() slot:

void MainWindow::open()
{
   QString fname = QFileDialog::getOpenFileName(this, tr("Put your dialog caption here"));
   QFile openFile(fname); // you may check for fname.isEmpty before
   openFile.open(QIODevice::ReadOnly); // you should do some error checking here!
   QByteArray content = openFile.readAll(); 
   txt->setPlainText(QString(content));
}

void MainWindow::open()
{
   QString fname = QFileDialog::getOpenFileName(this, tr("Put your dialog caption here"));
   QFile openFile(fname); // you may check for fname.isEmpty before
   openFile.open(QIODevice::ReadOnly); // you should do some error checking here!
   QByteArray content = openFile.readAll(); 
   txt->setPlainText(QString(content));
}

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If you don't find the methods you're looking for in the documentation of a class, you may also look into the documentation of its parent class. In the code snippet above, readAll() e.g. is documented in class QIODevice, the parent class of QFile.

[squidge]

Is there a reason you are both initialising the UI (ui.setupUI) and creating your own widgets? As stated previously, you would normally let the setupUI create all your widgets for you, and if you don't want that, you would remove the references to the UI namespace.