This is part of a more general work dedicated to gtkmm accessible here. This example shows how to load and display an image in a window.

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Source code

main.cpp

#include 
#include 


int main(int argc, char* argv[])
{
	// Initialize gtkmm
	Gtk::Main app(argc, argv);
	// Create the window
	mainwindow w;
	// Start main loop
	Gtk::Main::run(w);
	return 0;
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include 


// The class mainwindow inherits from Gtk::Window
class mainwindow : public Gtk::Window
{
	// Constructor and destructor
public:    
	mainwindow();
	virtual             ~mainwindow();

protected:

	//Member widgets:
	Gtk::Image              image;
	Gtk::Button             buttonQuit;
	Gtk::Grid               mainGrid;
};


#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include 


// Constructor of the main Window (build ui interface).
mainwindow::mainwindow()
{
	// Initialize the main window and hide the title bar
	this->set_border_width(10);

	// Load and display the image
	image.set("gtk.png");
	mainGrid.attach(image,0,0,1,1);

	// Add the Quit button
	buttonQuit.add_label("Quit");
	buttonQuit.signal_pressed().connect(sigc::mem_fun(*this,&mainwindow::close));
	mainGrid.attach(buttonQuit,0,2,1,1);

	// Display the main grid in the main window
	mainGrid.show_all();

	// Insert the grid in the main window
	add(mainGrid);
}


// Destructor of the class
mainwindow::~mainwindow()
{}