GTK3.0 uses CSS to set the background color of the control_html/css_WEB-ITnose

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GTK 2.0 When running in windows, a text box will appear Unable to enter problem. I searched a lot of information and found that this is a problem with version 2.0, but no good solution has been found yet. But using GTK3.0 has no effect. However, GTK3.0 did not find a suitable method for setting the background image of the control. Refer to the examples given online and use CSS to implement it (see the reference materials for details). However, it does not take effect when running under Windows. The specific reason is unknown:

/*  Compile with:   gcc -Wall -o backimage `pkg-config --cflags --libs gtk+-3.0` backimage.c */#include <gtk/gtk.h>int main(int argc, char *argv[]){  GtkWidget *window;/*----- CSS ----------- */  GtkCssProvider *provider;  GdkDisplay *display;  GdkScreen *screen;/*-----------------------*/  gtk_init (&argc, &argv);  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);/*    gtk_window_set_default_size (GTK_WINDOW(window),                                 500, 300);*/  g_signal_connect (GTK_WIDGET(window),                    "destroy",                    G_CALLBACK (gtk_main_quit),                    NULL);/*------------- CSS  --------------------------------------------------------------------------------------------------*/  provider = gtk_css_provider_new ();  display = gdk_display_get_default ();  screen = gdk_display_get_default_screen (display);  gtk_style_context_add_provider_for_screen (screen,                                             GTK_STYLE_PROVIDER(provider),                                             GTK_STYLE_PROVIDER_PRIORITY_USER);  gtk_css_provider_load_from_data (GTK_CSS_PROVIDER (provider),                                     " GtkWindow {\n"                                                              "   background-image: url('abstract-blue-02.jpg');\n"                                        "}\n", -1, NULL);  g_object_unref (provider);/*----------------------------------------------------------------------------------------------------------------------*/  gtk_widget_show_all (window);  gtk_main ();return(0);}

ＧＴＫ３.0Ｕｂｕｎｽtｕ The installation command under the system is as follows:

apt-get install gtk3.0

References:

http://www.gtkforums.com/viewtopic.php?f=3&t=988&sid=b63d18d182917efd7e2b04eb8c5e50c1&start=15