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.