Source Code

File: examplewindow.h

#ifndef GTKMM_EXAMPLEWINDOW_H
#define GTKMM_EXAMPLEWINDOW_H

#include <gtkmm.h>

class ExampleWindow : public Gtk::Window
{
public:
  ExampleWindow();
  virtual ~ExampleWindow();

protected:
  //Signal handlers:
  virtual void on_button_file_clicked();
  virtual void on_button_folder_clicked();

  //Child widgets:
  Gtk::VButtonBox m_ButtonBox;
  Gtk::Button m_Button_File, m_Button_Folder;
};

#endif //GTKMM_EXAMPLEWINDOW_H

File: examplewindow.cc

#include "examplewindow.h"
#include <gtkmm/dialog.h>
#include <iostream>


ExampleWindow::ExampleWindow()
: m_Button_File("Choose File"),
  m_Button_Folder("Choose Folder")
{
  set_title("Gtk::FileSelection example");

  add(m_ButtonBox);
  
  m_ButtonBox.pack_start(m_Button_File);
  m_Button_File.signal_clicked().connect( SigC::slot(*this, &ExampleWindow::on_button_file_clicked) );

  m_ButtonBox.pack_start(m_Button_Folder);
  m_Button_Folder.signal_clicked().connect( SigC::slot(*this, &ExampleWindow::on_button_folder_clicked) );

  show_all_children();
}

ExampleWindow::~ExampleWindow()
{
}

void ExampleWindow::on_button_folder_clicked()
{
  Gtk::FileSelection dialog("Please choose a folder");
  dialog.set_transient_for(*this);
  dialog.get_file_list()->get_parent()->hide(); //Prevent the user from selecting a file.

  int result = dialog.run();

  //Handle the response:
  switch(result)
  {
    case(Gtk::RESPONSE_OK):
    {
      std::cout << "OK clicked." << std::endl;
      std::cout << "Folder selected: " << dialog.get_filename() << std::endl;
      break;
    }
    case(Gtk::RESPONSE_CANCEL):
    {
      std::cout << "Cancel clicked." << std::endl;
      break;
    }
    default:
    {
      std::cout << "Unexpected button clicked." << std::endl;
      break;
    }
  }
}

void ExampleWindow::on_button_file_clicked()
{
  Gtk::FileSelection dialog("Please choose a file");
  dialog.set_transient_for(*this);
  
  int result = dialog.run();

  //Handle the response:
  switch(result)
  {
    case(Gtk::RESPONSE_OK):
    {
      std::cout << "OK clicked." << std::endl;

      std::string filename = dialog.get_filename(); //Notice that it is a std::string, not a Glib::ustring.
      std::cout << "File selected: " <<  filename << std::endl;
      break;
    }
    case(Gtk::RESPONSE_CANCEL):
    {
      std::cout << "Cancel clicked." << std::endl;
      break;
    }
    default:
    {
      std::cout << "Unexpected button clicked." << std::endl;
      break;
    }
  }
  
}

File: main.cc

#include <gtkmm/main.h>
#include <examplewindow.h>

int main(int argc, char *argv[])
{
  Gtk::Main kit(argc, argv);

  ExampleWindow window;
  Gtk::Main::run(window); //Shows the window and returns when it is closed.

  return 0;
}