gtk-color-selection : how do i convert these floating-point values?

Hi. xemacs + gtk is a really good thing. i was trying to make a generic GTK-based color-selector for use with psgml-html, but i got hung-up at trying to figure out how to convert the return-values of gtk-color-selection-get-color to RGB hex -- #ffffff or so -- and was hoping that someone on this list would have some suggestions about it. the test case: in the gtk color-selection-dialog window, these are the values shown for hue, saturation, value, red, green, and blue: H: 221.04 S: 1.00 V: 1.00 R: 0.00 G: 0.32 ( xmag shows #x50 for this color component, 80 in decimal ) B: 1.00 ( xmag shows #xFF for this , 255 in decimal ) and this is the return value from a gtk-color-selection-get-color on the colorsel in that window: (1.257249826960619e-269 -1.992481946943558 3.713488760714563e-314 1.135730676382305e-268) how can any of those first three elts be converted into an integer no greater than 255, one which would match the given color component? -1.992481946943558 =[??]=> 80 ?? here's the code i was using to get that return-value., note that these functions don't do anything to destroy the color-selection window. i haven't got that far into the gtk of it, yet. (defun egtk-close-window (&rest ignore) (gtk-main-quit) t) (defun egtk-read-color (default-color &optional window-title) (let ((color-dialog (gtk-color-selection-dialog-new (or window-title "color")))) (gtk-signal-connect color-dialog "delete_event" #'egtk-close-window) (gtk-signal-connect color-dialog "destroy" #'egtk-close-window) (gtk-signal-connect (gtk-color-selection-dialog-ok-button color-dialog) "clicked" #'egtk-close-window) (gtk-signal-connect (gtk-color-selection-dialog-cancel-button color-dialog) "clicked" #'egtk-close-window) (gtk-widget-show color-dialog) (gtk-main) (gtk-color-selection-get-color (gtk-color-selection-dialog-colorsel color-dialog))))