A priority queue is like a standard queue, but instead of dequeuing items on a first-in-first-out basis, items are instead served by priority. There are lots of implementations of a priority queue, but none I could find which let the user re-order items. The following class functions just like a regular queue, but can also change the order of items in the queue by their index.
The queue is designed to be used with a ListView set to details mode, but could be adapted for use elsewhere. Using it with a ListView makes sense since the first item in the queue (the next to be executed) is always at index 0, and the indexing for a ListView also starts at 0.
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Ever needed to retrieve the shell icon for a particular file type in C#? This class will retrieve the Icon associated with a file from just the extension.
using System;
using System.Runtime.InteropServices;
using System.Drawing;
namespace Lime49.Utils {
/// <summary>
/// Retrievs shell info associated with a file or filetype
/// </summary>
/// <summary>
/// Get a 32x32 or 16x16 System.Drawing.Icon depending on which function you call
/// either GetSmallIcon(string fileName) or GetLargeIcon(string fileName)
/// </summary>
public class ShellIcon {
[StructLayout(LayoutKind.Sequential)]
public struct SHFILEINFO {
public IntPtr hIcon;
public IntPtr iIcon;
public uint dwAttributes;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string szDisplayName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
public string szTypeName;
};
class Win32 {
public const uint SHGFI_ICON = 0x100;
public const uint SHGFI_LARGEICON = 0x0; // Large icon
public const uint SHGFI_SMALLICON = 0x1; // Small icon
public const uint USEFILEATTRIBUTES = 0x000000010; // when the full path isn't available
[DllImport("shell32.dll")]
public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);
[DllImport("User32.dll")]
public static extern int DestroyIcon(IntPtr hIcon);
}
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