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A recent AVG and Avast antivirus update is preventing DisplayFusion 9.9 from launching on some systems.
If you're running into this issue, please update to the latest DisplayFusion 10.0 Beta.

Change Desktop Icon Size

This script lets you choose the desktop icon size from a drop-down list.
Minimum Version
Created By
Thomas Malloch (BFS)
Date Created
May 2, 2016
Date Last Modified
May 2, 2016

Scripted Function (Macro) Code

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Runtime.InteropServices;

// The 'windowHandle' parameter will contain the window handle for the:
//   - Active window when run by hotkey
//   - Trigger target when run by a Trigger rule
//   - TitleBar Button owner when run by a TitleBar Button
//   - Jump List owner when run from a Taskbar Jump List
//   - Currently focused window if none of these match
public static class DisplayFusionFunction
	[DllImport("user32.dll", PreserveSig = true, SetLastError = false, CharSet = CharSet.Unicode)]
	private static extern IntPtr FindWindow(string lpClassName, IntPtr lpWindowName);

	[DllImport("user32.dll", PreserveSig = true, SetLastError = false, CharSet = CharSet.Unicode)]
	private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, IntPtr ZeroOnly);

	[DllImport("user32.dll", PreserveSig = true, SetLastError = false, CharSet = CharSet.Unicode)]
	private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, uint wParam, IntPtr lParam);

	[DllImport("user32.dll", PreserveSig = true, SetLastError = false)]
	[return: MarshalAs(UnmanagedType.Bool)]
	private static extern bool EnumWindows(EnumWindowCallback callPtr, IntPtr lParam);
	private delegate bool EnumWindowCallback(IntPtr hwnd, IntPtr lParam);
	private const uint WM_COMMAND = 0x0111;	
	public static void Run(IntPtr windowHandle)
		//create a dictionary to store the icon size messages and the names of the sizes
		Dictionary<string, uint> iconSizes = new Dictionary<string, uint>
			{"Small", 28752},
			{"Medium", 28750},
			{"Large", 28751}
		//try to get the shell window
		IntPtr shell = FindShellWindow();
		//if we couldn't find the shell window, exit the script
		if(shell == IntPtr.Zero)
		//ask the user what size they would like the icons
		string selection = BFS.Dialog.GetUserInputList("What size would you like the icons?", new List<string>(iconSizes.Keys).ToArray());
		//if the user cancelled, exit the script
		//send a message to the shell window with the user's selection
		SendMessage(shell, WM_COMMAND, iconSizes[selection], IntPtr.Zero);
	private static IntPtr FindShellWindow()
		//try to find the shell window. it's either a child of Progman, or tucked away in some WorkerW
		IntPtr progman = FindWindow("Progman", IntPtr.Zero);
		IntPtr shell = FindWindowEx(progman, IntPtr.Zero, "SHELLDLL_DefView", IntPtr.Zero);
		if(shell != IntPtr.Zero)
			return shell;
		//enumerate through the windows until we find a WorkerW with SHELLDLL_DefView as it's child
		EnumWindows(delegate(IntPtr hwnd, IntPtr lParam)
			//not a WorkerW
			if(!BFS.Window.GetClass(hwnd).Equals("WorkerW", StringComparison.OrdinalIgnoreCase))
				return true;
			//see if this WorkerW contains the shell window
			shell = FindWindowEx(hwnd, IntPtr.Zero, "SHELLDLL_DefView", IntPtr.Zero);
			//if it doesn't continue enemerating
			if(shell == IntPtr.Zero)
				return true;
			//if we got this far, we found the shell window. stop enumerating.
			return false;
		}, IntPtr.Zero);
		return shell;