public static Icon GetFolderIcon()
{
// Need to add size check, although errors generated at present!
uint flags = NativeMethods.ShgfiIcon | NativeMethods.Usefileattributes;
flags += NativeMethods.ShgfiOpenIcon;
flags += NativeMethods.ShgfiSmallicon;
// Get the folder icon
var shfi = new NativeMethods.Shfileinfo();
NativeMethods.SHGetFileInfo(@"C:\Windows",
NativeMethods.FileAttributeDirectory,
ref shfi,
(uint)Marshal.SizeOf(shfi),
flags);
Icon.FromHandle(shfi.hIcon); // Load the icon from an HICON handle
// Now clone the icon, so that it can be successfully stored in an ImageList
var icon = (Icon)Icon.FromHandle(shfi.hIcon).Clone();
NativeMethods.DestroyIcon(shfi.hIcon); // Cleanup
return icon;
}
public static Icon GetSmallIcon(string fileName)
{
try
{
if (string.IsNullOrEmpty(fileName))
{
Logger.LogError("Invalid file name passed into GetLargeIcon.");
return null;
}
// This just ensures that multiple threads don't try access the cache at the same time.
lock (_lock)
{
// Caching the icon to prevent Win32 handle that was passed to Icon is not valid or is the wrong type.
string extension = Path.GetExtension(fileName);
if (string.IsNullOrEmpty(extension))
{
//Global.Logger.Info("Failed to get the extension for the following file: " + fileName);
// let it continue so that it returns the default missing icon.
}
else if (IconCache.ContainsKey(extension))
{
return IconCache[extension];
}
var shinfo = new NativeMethods.Shfileinfo();
NativeMethods.SHGetFileInfo(fileName,
0,
ref shinfo,
(uint)Marshal.SizeOf(shinfo),
NativeMethods.ShgfiIcon | NativeMethods.ShgfiSmallicon | NativeMethods.Usefileattributes);
//The icon is returned in the hIcon member of the shinfo struct
if (shinfo.hIcon != IntPtr.Zero)
{
var icon = (Icon)Icon.FromHandle(shinfo.hIcon).Clone();
NativeMethods.DestroyIcon(shinfo.hIcon);
if (!string.IsNullOrEmpty(extension) && extension.ToLower() != ".exe") // exe files can have different icons
{
IconCache.Add(extension, icon);
}
return icon;
}
return null;
}
}
catch (Exception)
{
return null;
}
}
public static Icon GetLargeIcon(string fileName)
{
if (string.IsNullOrEmpty(fileName))
{
Logger.LogError("Invalid file name passed into GetLargeIcon.");
return null;
}
var shinfo = new NativeMethods.Shfileinfo();
NativeMethods.SHGetFileInfo(fileName,
0,
ref shinfo,
(uint) Marshal.SizeOf(shinfo),
NativeMethods.ShgfiIcon | NativeMethods.ShgfiLargeicon | NativeMethods.Usefileattributes);
var icon = (Icon) Icon.FromHandle(shinfo.hIcon).Clone();
NativeMethods.DestroyIcon(shinfo.hIcon);
return icon;
}