[Gtk-sharp-list] ColorSelection fixes/custom

Lee Mallabone gnome@fonicmonkey.net
26 Mar 2003 09:15:52 +0000

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Hi all,

As report in bug #38672, a couple of methods in ColorSelection are

I've tried to fix them with the attached patch - PaletteToString now
work as expected.

However, PaletteFromString crashes with a NullReferenceException. I
assume this is something to do with the way I've wrapped the C method

gboolean    gtk_color_selection_palette_from_string
                                     (const gchar *str,
                                      GdkColor **colors,
                                      gint *n_colors);
as this:

static extern bool gtk_color_selection_palette_from_string(string str, out Gdk.Color[] colors, out int n_colors);

I've attached my new ColorSelection.custom file, and a sample that crashes on the PaletteFromString method... Does anyone have any insight?

I assume it's crashing because the output 'colors' can not be allocated by the C library. However, I'm unsure how to fix it further, so any help would be appreciated.

I've also attached the metadata changes needed to suppress the default generation for these methods.



Content-Disposition: attachment; filename=ColorSelection.custom
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// Gtk.ColorSelection.custom - customizations and corrections for ColorSelection
// Author: Lee Mallabone <gnome@fonicmonkey.net>

		static extern string gtk_color_selection_palette_to_string(Gdk.Color[] colors, int n_colors);

		/// <summary> PaletteToString Method </summary>
		public static string PaletteToString(Gdk.Color[] colors) {
			int n_colors = colors.Length;
			string raw_ret = gtk_color_selection_palette_to_string(colors, n_colors);
			string ret = raw_ret;
			return ret;
		static extern bool gtk_color_selection_palette_from_string(string str, out Gdk.Color[] colors, out int n_colors);

		/// <summary> PaletteFromString Method </summary>
		public static Gdk.Color[] PaletteFromString(string str) {
			Gdk.Color[] parsedColors;
			int n_colors;
			bool raw_ret = gtk_color_selection_palette_from_string(str, out parsedColors, out n_colors);
			// If things failed, return silently
			if (!raw_ret)
				return null;
			return parsedColors;

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using Gtk;
using Gdk;
using System;

public class ColorSample {
	public static void Main()
		// Setup simple colors
		Gdk.Color black = new Gdk.Color(0x00, 0x00, 0x00);
		Gdk.Color white = new Gdk.Color(0xFF, 0xFF, 0xFF);
		Gdk.Color[] colors = new Gdk.Color[] { black, white };
		Console.WriteLine("------ PaletteToString test ------");
		string parsedPalette = ColorSelection.PaletteToString(colors);
		Console.WriteLine("Got palette as: " + parsedPalette);

		Console.WriteLine("------ PaletteFromString test ------");
		Gdk.Color[] parsedColors = ColorSelection.PaletteFromString(parsedPalette);
		if (parsedColors == null)
			Console.WriteLine("Parsed palette array is null");
			Console.WriteLine("Parsed palette array is: " + parsedColors);

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Index: Gtk.metadata
RCS file: /cvs/public/gtk-sharp/sources/Gtk.metadata,v
retrieving revision 1.46
diff -u -r1.46 Gtk.metadata
--- Gtk.metadata	25 Mar 2003 19:05:40 -0000	1.46
+++ Gtk.metadata	26 Mar 2003 09:22:11 -0000
@@ -1508,6 +1508,18 @@
+  <class name="GtkColorSelection">
+    <method>PaletteToString</method>
+	<method>PaletteFromString</method>
+  </class>
+  <data>
+    <attribute target="method">
+	  <name>hidden</name>
+	  <value>1</value>
+	</attribute>
+  </data>
   <class name="GtkWidget">