Re: loading an image with gtk_image_new_from_pixbuf and gtk_image_set_from_pixbuf

[shakti <shprasad novell com>]

Did you try to pass the vbox to the callback?

gtk_box_pack_start (GTK_BOX (vbox), display->myImage,
                                           FALSE, FALSE, 0);
                                                                               

gtk_signal_connect(GTK_OBJECT(b),"clicked",GTK_SIGNAL_FUNC(refresh_cb),vbox);

And in the callback function (refresh_cb):

gtk_box_pack_start (GTK_BOX (data), display->myImage,
                                           FALSE, FALSE, 0);

Thanks,
Shakti

John Que wrote:

> I tried to write a little application in gtk 2.0.
> My aim is to load a bitmap , and then that pressing a button will load 
> a different
> bitmap.
> I want to use the gtk_image_new_from_pixbuf() and 
> gtk_image_set_from_pixbuf()
> methods of gtk pixbuf ; I do not want to use drawing area and 
> gdk_draw() methods.
>
> Now, loading a bitmap works; but pressing a button to call a callback
> which loads an image from a file and displays it does not work.
> But I see that I do reach the callback and gdk_pixbuf_new_from_file(()
> does succeed,
>
> (I was little inspired by the stockbrowser example)
>
> Here is the code ; It s not long ; It can be compiled and run.
>
> I will appreciate any help/idea
>
> // TEST.C
>
> #include <gtk/gtk.h>
>
> static GtkWidget* window;
>
> typedef struct WidgetDisplay
>     {
>  GtkWidget* myImage;
>     } WidgetDisplay;
>
> WidgetDisplay* display;
>
>
> static void close(GtkWidget *widget, gpointer data)
> {
>     gtk_main_quit();
> }
>
>
>
> static void refresh_cb(GtkWidget* w, gpointer data)
>     {
>     GtkWidget *image;
>
>     char* filenmae = "ice-blue.jpg";
>     printf("in refresh_cb \n");
>     GdkPixbuf* pixbuf = gdk_pixbuf_new_from_file(filenmae,NULL);
>     if (pixbuf == NULL)
>         printf("pixbuf == NULL \n");
>     else
>         printf("pixbuf != NULL \n");
>     display->myImage = gtk_image_new_from_pixbuf(pixbuf);
>     if (display->myImage == NULL)
>         {
>         printf("display->myImage is NULL\n");
>         }
>
>  gtk_image_set_from_pixbuf(GTK_IMAGE(display->myImage),
>                           GDK_PIXBUF(pixbuf));
>     gtk_widget_show_all(window);
>
>     printf("after gtk_widget_show_all \n");
>
>     }
>
>
> ////////////////////////////////////////////////////////////////////////////// 
>
>
> int main(int argc, char **argv)
> {
>     GtkWidget *image;
>     GdkPixbuf *pixbuf;
>  GtkWidget *vbox;
>     GtkWidget* frame;
>     GtkWidget* hbox;
>  GtkWidget *align;
>
>     GtkWidget* b;
>     GError *err = NULL;
>     int width;
>  int height;
>
>
>     gtk_init(&argc, &argv);
>     b = gtk_button_new();
>
>     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>
>     frame = gtk_frame_new("test");
>
>  display = g_new (WidgetDisplay, 1);
>
>     hbox = gtk_hbox_new (FALSE, 8);
>     gtk_container_add (GTK_CONTAINER (window), hbox);
>
>     align = gtk_alignment_new (0.5, 0.0, 0.0, 0.0);
>     gtk_box_pack_end (GTK_BOX (hbox), align, FALSE, FALSE, 0);
>
>     frame = gtk_frame_new ("Selected Item");
>     gtk_container_add (GTK_CONTAINER (align), frame);
>
>     vbox = gtk_vbox_new (FALSE, 8);
>     gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
>     gtk_container_add (GTK_CONTAINER (frame), vbox);
>
>
>     if (argc != 2)
>         {
>         g_error("Usage: %s file\n\n", argv[0]);
>         }
>
>     gtk_window_set_default_size(GTK_WINDOW(window),200,200);
>
>     g_signal_connect (G_OBJECT(window), "delete-event", 
> G_CALLBACK(close), NULL);
>
>     gtk_signal_connect(GTK_OBJECT(b),"clicked",GTK_SIGNAL_FUNC(refresh_cb),NULL); 
>
>
>     pixbuf = gdk_pixbuf_new_from_file(argv[1], &err);
>
>     if (pixbuf == NULL)
>         {
>         g_error("Can't open %s\nerror: (%d) %s", argv[0], err->code, 
> err->message);
>         printf("Can't open \n");
>         }
>     else
>         printf("pixbuf is not NULL \n");
>
>     display->myImage=gtk_image_new_from_pixbuf(pixbuf);
>     gtk_container_add(GTK_CONTAINER(vbox), b);
>
>
>     gtk_box_pack_start (GTK_BOX (vbox), display->myImage,
>                                             FALSE, FALSE, 0);
>
>     gdk_pixbuf_unref(pixbuf);
>     gtk_widget_show_all(window);
>
>     gtk_main();
>     }
>
>
>
> regards,
> John
>
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