问从SHGetFileInfo()返回的图标的最大大小是多少？

EN

public const uint SHGFI_LARGEICON = 0x000000000;     // get large icon
public const uint SHGFI_SMALLICON = 0x000000001;     // get small icon
public const uint SHIL_JUMBO = 0x000000004;     // get jumbo icon 256x256
public const uint SHIL_EXTRALARGE = 0x000000002;     // get extra large icon 48x48
public const uint SHIL_LARGE = 0x000000000;     // get large icon 32x32
public const uint SHIL_SMALL = 0x000000001;     // get small icon 16x16
public const uint SHIL_SYSSMALL = 0x000000003;     // get icon based off of GetSystemMetrics

public const uint SHIL_JUMBO = 0x000000004;     // get jumbo icon 256x256
public const uint SHIL_EXTRALARGE = 0x000000002;     // get extra large icon 48x48
public const uint SHIL_LARGE = 0x000000000;     // get large icon 32x32
public const uint SHIL_SMALL = 0x000000001;     // get small icon 16x16
public const uint SHIL_SYSSMALL = 0x000000003;     // get icon based off of GetSystemMetrics
public const uint SHGFI_ICON = 0x000000100;     // get icon
public const uint SHGFI_OPENICON = 0x000000002;     // get open icon

[DllImport("Shell32.dll")]
public static extern IntPtr SHGetFileInfo(
    IntPtr pszPath,
    uint dwFileAttributes,
    ref SHFILEINFO psfi,
    uint cbFileInfo,
    uint uFlags
);
[DllImport("User32.dll")]
public static extern int DestroyIcon(IntPtr hIcon);

public struct SHFILEINFO
{
    public const int NAMESIZE = 80;
    public IntPtr hIcon;
    public int iIcon;
    public uint dwAttributes;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = MAX_PATH)]
    public string szDisplayName;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = NAMESIZE)]
    public string szTypeName;
}

public enum IconSize
{
    Jumbo = 4, //256x256
    ExtraLarge = 2, //48x48
    Large = 0, //32x32
    Small = 1 //16x16
}

IconSize size = IconSize.ExtraLarge;

uint flags = SHGFI_ICON;
flags |= SHGFI_OPENICON;
switch (size)
{
    case IconSize.Small:
        flags |= SHIL_SMALL;
        break;
    case IconSize.Large:
        flags |= SHIL_LARGE;
        break;
    case IconSize.ExtraLarge:
        flags |= SHIL_EXTRALARGE;
        break;
    case IconSize.Jumbo:
        flags |= SHIL_JUMBO;
        break;
}

//Get me a PDIL to the My Documents folder (this is done with a LOT of other
//code but I know for a fact it returns the name, path, and PDIL correctly!
CGFolder cFolder = new CGFolder(Environment.SpecialFolder.MyDocuments);

string sName = cFolder.Pidl.DisplayName;   
string sPath = cFolder.Pidl.PhysicalPath;
IntPtr ptrPDIL = cFolder.Pidl.Pidl;
SHFILEINFO shfi = new SHFILEINFO();
SHGetFileInfo(ptrPDIL, 0, ref shfi, (uint)Marshal.SizeOf(shfi), flags);

if (shfi.hIcon == IntPtr.Zero) return null;

icon = (Icon)Icon.FromHandle(shfi.hIcon).Clone();

DestroyIcon(shfi.hIcon);

return icon;