Tutorial :undefined reference to gdk_pixbuf_new_from_file_utf8



Question:

I have the following C GTK+ code and I get the following error trying to compile:

undefined reference to gdk_pixbuf_new_from_file_utf8

Code:

#include <stdlib.h>  #include <gtk/gtk.h>    GdkPixbuf *create_pixbuf(const gchar *filename)  {      GdkPixbuf *pixbuf;      GError *error = NULL;      pixbuf = gdk_pixbuf_new_from_file(filename, &error);      if (!pixbuf)      {          fprintf(stderr, "%s\n", error->message);          g_error_free(error);      }        return pixbuf;  }    int main (int argc, char *argv[])  {        GtkWidget *window;        gtk_init(&argc, &argv);        window = gtk_window_new(GTK_WINDOW_TOPLEVEL);      gtk_window_set_title(GTK_WINDOW(window), "Center");      gtk_window_set_default_size(GTK_WINDOW(window), 230, 150);      gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);      gtk_window_set_icon(GTK_WINDOW(window), create_pixbuf("someimg.jpg"));      gtk_widget_show(window);        g_signal_connect_swapped(G_OBJECT(window), "destroy",          G_CALLBACK(gtk_main_quit), NULL);        gtk_main();      return 0;  }  

Can anybody tell me whats wrong?


Solution:1

Just successfully compiled your code after doing the following:

Add the following two includes:

#include <glib/gerror.h>  #include <gdk-pixbuf/gdk-pixbuf.h>  

And compile with:

gcc `pkg-config --cflags --libs gtk+-2.0` test.c -o test  

The pkg-config gives the following output:

-I/usr/include/gtk-2.0 -I/usr/lib/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12  -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lgdk_pixbuf-2.0 -lpangocairo-1.0 -lcairo -lpango-1.0 -lfreetype -lfontconfig -lgobject-2.0 -lgmodule-2.0 -lglib-2.0  

So you need to link with the following libraries:

  • gtk-x11-2.0
  • gdk-x11-2.0
  • atk-1.0
  • gio-2.0
  • pangoft2-1.0
  • gdk_pixbuf-2.0
  • pangocairo-1.0
  • cairo
  • pango-1.0
  • freetype
  • fontconfig
  • gobject-2.0
  • gmodule-2.0
  • glib-2.0

You may be able to leave out a few, if you want to try just start with gdk_pixbuf-2.0 and see if you still get any undefined references when you link.

Just tried, seems that for your code gtk-x11-2.0 and gdk_pixbuf-2.0 are sufficient.

A quick google seems to indicate that in your project options window you should have a linker tab where you can list all the libraries that should be linked with your code. If you're not on linux/unix you may need a diferent gtk library since gtk-x11-2.0 is specific to the X Window System.


Solution:2

gdk_pixbuf_new_from_file is defined in gtk-2.0/gdk-pixbuf/gdk-pixbuf-core.h

But rather than including that file directly, it looks like the gdk-pixbuf library expects you to use just one header for all functionality. Try adding the following line:

#include <gdk-pixbuf/gdk-pixbuf.h>  

(gdk_pixbuf_new_from_file is a preprocessor macro which simply functions as an alias for gdk_pixbuf_new_from_file_utf8. This is why the error message shows a different function name than what you actually used in your code example.)


Solution:3

Never used GTK, but 2 seconds googling suggests you need to add:

#include <gdk-pixbuf/gdk-pixbuf.h>  

To the top of your file.


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