cannot draw lines in a GtkDrawingArea widget

[heavenscape <masonduan1 sina com>]

Hi all,

I need to draw some lines in a GtkDrawingArea widget, and I use the
following code:

GtkWidget* w = lookup_widget(MainWnd,"drawingarea1"); 
gdk_draw_line(w->window, //  a GdkDrawable - a GdkWindow
		w->style->fg_gc[GTK_WIDGET_STATE (w)],// a GdkGC.
		10,//the x coordinate of the start point
		30,//the y coordinate of the start point
		580,//the x coordinate of the end point
		30 //the y coordinate of the start point
		);

it does not work! Anybody knows why?

Thanks!!
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