Hi -

I'm a complete newbie to GTK+:

We're writing a Linux-based app; one of our requirements is that the GUI must be
able to address multiple different video cards independently.

SuSE 9.2 recognizes each of the three video cards in our system, and addresses t
hem as:

unix:0.0
unix:0.1
... and ...
unix:0.2

So far, so good.

I've installed the default GTK+/GDK libraries that come with SuSE 9.2 (GTK2, 2.4 .9-10.1), and I'm trying to adapt the sample code in "Multi-head Support Overview". It's failing with this link error:

make =>
gcc -g -O2 -o hello_glade main.o support.o interface.o callbacks.o \
-Wl,--export-dynamic -L/opt/gnome/lib -lgtk-x11-2.0 -lgdk-x11-2.0 \
-latk-1.0 -lgdk_pixbuf-2.0 -lm -lpangoxft-1.0 -lpangox-1.0 -lpango-1.0 \
-lgobject-2.0 -lgmodule-2.0 -ldl -lglib-2.0
main.o(.text+0xb2): In function `main':
/home/paulsm/proj/hello_glade/src/main.c:56:
undefined reference to `gdk_display_new'

Does anybody have any ideas why my (C-language, not C++) build isn't finding this function?

Are there any alternative GTK+ functions for doing graphics I/O to multiple different video cards?

Thank you *very* much in advance .. PSM

You can compare the flags you had in the Makefile for the gcc command line with the result obtained from this command

Hi -

1. Thank you for your response.
Here's the output:

gtk-config --cflags --libs =>
-I/opt/gnome/include -I/opt/gnome/include/gtk-1.2 -I/opt/gnome/include/glib-1.2
-I/opt/gnome/lib/glib/include -I/usr/X11R6/include
-L/opt/gnome/lib -L/usr/X11R6/lib -lgtk -lgdk -rdynamic -lgmodule -lglib -ldl -lXi -lXext -lX11 -lm

2. This means that I have GTK 1.2 installed (I do, along with GTK+ 2.0 in parallel), and that
"gtk-config" happens to point to GKS 1.2.

3. My compile/link command, however, should be pointing exclusively to GTK+ 2.0. And that
GTK+ 2.0 build isn't finding gdj_display_new().

4. I'll de-install all the GTK development packages, re-install GTK+ 2.0, verify that gtk-config
now points to GTK +2.0, and re-try the make.

Your .. PSM

That function should be gdk_display_open(). See http://www.gtk.org/api/2.6/gdk/GdkDisplay.html

Hi -

1. Thank you very much, Harmaa Kettu. I just discovered the same thing a few moments before I saw your post

THIS CODE PERMITS REDIRECTING GTK+ GRAPHICS TO A DIFFERENT X DISPLAY (EXAMPLE: TO "unix:0.2"):
Harmaa Kettu

GtkWidget *
create_drawing_area ()
{
GdkDisplay *gdisplay;
GtkWidget *window;
GtkWidget *frame;
...

/* Create toplevel window */
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Drawing Area");

/* Assign screen and display */
gdisplay = gdk_display_open("unix:0.2");
if (gdisplay) {
GdkScreen *gscreen;
gscreen = gdk_display_get_default_screen(gdisplay);
if (gscreen) {
gtk_window_set_screen(GTK_WINDOW(window), gscreen);
}
else {
printf ("WARNING: Unable to get screen!\n");
...

2. Thank you, too, for your help ahwkong.

I discovered, however, that the reason "gtk-config" was pointing to my GTK 1.2 libraries ... is because
gtk-config (and glib-config, etc) are all GTK 1.2 scripts.

In GTK+ 2.0, all of the individual "g*-config" scripts have been replaced by one new, common tool:

pkg-config
<= THIS SHOULD BE USED FOR ALL CURRENT GTK+ DEVELOPMENT WORK

Your .. PSM