Re: why i can't set background of widget?

[Olexiy Avramchenko <olexiy irtech cn ua>]

gxw wrote:

> After run the following simple code,the button background is black,and can't see "Hello World",who can tell 
> me the reason?
>
>    style=gtk_style_new();
>    style->bg[GTK_STATE_NORMAL].red=0;
>    style->bg[GTK_STATE_NORMAL].green=0;
>    style->bg[GTK_STATE_NORMAL].blue=255;
>    gtk_widget_set_style(button,style);  
>  
You just specifying r/g/b components of the color, try allocate color 
before (this will set the pixel value). Better solution is to use 
gtk_widget_modify_bg() function:
http://developer.gnome.org/doc/API/2.0/gtk/GtkWidget.html#gtk-widget-modify-bg
You can pass non-allocated color as parameter.

As for color allocation, look at:
http://developer.gnome.org/doc/API/2.0/gdk/gdk-Colormaps-and-Colors.html

   Olexiy