In this lesson we will learn how to use QFileDialog in qt.
The QFileDialog class provides a dialog that allow users to select files or directories.
First lets see how to use static function QFileDialog::getOpenFileName

Basic syntax of QFileDialog::getOpenFileName

[static] QString QFileDialog::getOpenFileName(QWidget *parent = Q_NULLPTR, const QString &caption = QString(), const QString &dir = QString(), const QString &filter = QString(), QString *selectedFilter = Q_NULLPTR, Options options = Options())

This is a convenience static function that returns an existing file selected by the user. If the user presses Cancel, it returns a null string.

  QString fileName = QFileDialog::getOpenFileName(this, ("Open File"),
                                                  "/home",
                                                  ("Images (*.png *.xpm *.jpg)"));

 

Now Lets create a Program and see how we can use QFileDialog::getOpenFileName in practice

File->New File or Project…
Applications->Qt Gui Application->Choose…
We keep the class as MainWindow as given by default.

Now write the code below in main.cpp

#include <QApplication>
#include <QFileDialog>
#include <QDebug>

class QFileDialogTester : public QWidget
{
public:
  void openFile()
  {
    QString filename =  QFileDialog::getOpenFileName(
          this,
          "Open Document",
          QDir::currentPath(),
          "All files (*.*) ;; Document files (*.doc *.rtf);; PNG files (*.png)");

    if( !filename.isNull() )
    {
      qDebug() << "selected file path : " << filename.toUtf8();
    }
  }
};


int main( int argc, char **argv )
{
  QApplication app( argc, argv );

  QFileDialogTester test;
  test.openFile();

  return 0;
}

Now build and run the program.

After selecting the file using open file dialog this code will print the path of the selected file in console.

OUTPUT

selected file path :  "your/project/dir//coffee-cup-icon.png"