Re: Show a JPG-Image in a GTK-Window with GTK 2

[David Voit <david voit t-online de>]

Christian Schneider wrote:

> Hallo,
>
> someone gave me the advise to load a JPG in a window
> with this Code:
>
> ////////////////////////////////////////////////////
> GError *err = NULL;
> GtkWindow *win;
> GdkPixbuf *pixbuf;
> GdkPixmap *pixmap;
> g_type_init ();
> pixbuf = gdk_pixbuf_new_from_file("test.JPG", &err);
> gdk_pixbuf_render_pixmap_and_mask(pixbuf, &pixmap,
> NULL, 0);
> g_object_unref(pixbuf);
> /*53*/win = gtk_window_new (GTK_WINDOW_TOPLEVEL);
>
> /*55*/gtk_widget_set_app_paintable(GTK_WIDGET(win),
> GTK_TRUE);
> gtk_widget_realize(GTK_WIDGET(win));
> /*57*/gdk_window_set_back_pixmap(win->window, pixmap,
> GTK_FALSE);
> g_object_unref(pixmap);
> ////////////////////////////////////////////////////
>
> If I compile this, I get the following Compileerror:
> ****************************************************
> main.c:53: warning: assignment from incompatible
> pointer type
> main.c:55: `GTK_TRUE' undeclared (first use in this
> function)
> main.c:55: (Each undeclared identifier is reported
> only once
> main.c:55: for each function it appears in.)
> main.c:57: structure has no member named `window'
> main.c:57: `GTK_FALSE' undeclared (first use in this
> function)
> ****************************************************
> Where can I find GTK_TRUE and GTK_FALSE and use it or
> is there an alternative for my problem?
>
>
> If I use the following code only I will get an error
> "Speicherzugriffsfehler" (Segmentation fault) after
> compiling and testing my program. Why? And can you
> give me a solution?:
>
> ////////////////////////////////////////////////////
> GError *err = NULL;
> GtkWindow *win;
> GdkPixbuf *pixbuf;
> GdkPixmap *pixmap;
>  g_type_init ();
> pixbuf = gdk_pixbuf_new_from_file("treffen.JPG",
> &err); /*If I use ddd it is shown "
> for pixbuf*/
> gdk_pixbuf_render_pixmap_and_mask(pixbuf, &pixmap,
> NULL, 0); /*This ist the segmentation fault line shown
> by ddd: "in gdk_rgb_set_min_colors () from
> /usr/lib/libgdk-x11-2.0.so.0"*/
> ////////////////////////////////////////////////////
>
> Can someone help me?
> Bye
> Christian Schneider

Hi

1.) You need gtk_init not g_type_init
2.) GTK_TRUE = TRUE and GTK_FALSE=FALSE

Bye
David