Vala Poppler Sample

/* Using Poppler for PDF rendering in Vala sample code */

using GLib;

public class PopplerSample : GLib.Object {

    private Gtk.Window win;

    // To store the document and the current page
    private Poppler.Document document;
    private int index = 0;

    private string _file_uri;
    public string file_uri {
        construct {
            // When constructing, turn the file name into a uri
            this._file_uri = "file://%s".printf (value);
        }
        get {
            return this._file_uri;
        }
    }

    // To create an application object with the name of the file to display
    public PopplerSample (string file_name) {
        this.file_uri = file_name;
    }

    construct {
        this.document = new Poppler.Document.from_file (this.file_uri, "");

        // Render the first page
        var page = this.document.get_page (this.index);
        var pixbuf = new Gdk.Pixbuf (Gdk.Colorspace.RGB, false, 8, 800, 600);
        page.render_to_pixbuf (0, 0, 800, 600, 1.0, 0, pixbuf);

        // Create a window to show an image, and set that image to show the buffer just rendered
        this.win = new Gtk.Window (Gtk.WindowType.TOPLEVEL);
        var image = new Gtk.Image.from_pixbuf (pixbuf);
        this.win.add (image);

        this.win.key_press_event += next_cb;
        this.win.destroy += Gtk.main_quit;
    }

    private bool next_cb (Gtk.Window w, Gdk.EventKey e) {
        // If the key pressed was q, quit, else show the next page
        if (e.str == "q") {
            Gtk.main_quit ();
        }

        var image = (Gtk.Image) this.win.get_child ();
        var pixbuf = image.get_pixbuf ();

        // Render the next page, or the first if we were at the last
        this.index = (++this.index) % this.document.get_n_pages ();
        var page = this.document.get_page (this.index);
        page.render_to_pixbuf (0, 0, 800, 600, 1.0, 0, pixbuf);
        image.set_from_pixbuf (pixbuf);

        return false;
    }
 
    public void run () {
        this.win.show_all ();
        
        Gtk.main ();
    }
    
    public static void main (string[] args) {
        if (args.length != 2) {
            stderr.printf ("Usage: %s /full/path/to/some.pdf\n", args[0]);
            return;
        }

        Gtk.init (ref args);

        var app = new PopplerSample (args[1]);
        app.run ();
    }
}

Compile and Run

$ valac --pkg poppler-glib --pkg gtk+-2.0 -o popplersample PopplerSample.vala
$ ./popplersample /full/path/to/some.pdf