/// <summary>
/// Used to access system folder icons.
/// </summary>
/// <param name="size">Specify large or small icons.</param>
/// <param name="folderType">Specify open or closed FolderType.</param>
/// <returns>System.Drawing.Icon</returns>
private Icon GetFolderIcon(IconSize size, FolderType folderType)
{
// Need to add size check, although errors generated at present!
uint flags = Shell32.SHGFI_ICON | Shell32.SHGFI_USEFILEATTRIBUTES;
if (FolderType.Open == folderType)
{
flags += Shell32.SHGFI_OPENICON;
}
if (IconSize.Small == size)
{
flags += Shell32.SHGFI_SMALLICON;
}
else
{
flags += Shell32.SHGFI_LARGEICON;
}
// Get the folder icon
Shell32.SHFILEINFO shfi = new Shell32.SHFILEINFO();
IntPtr hSuccess = Shell32.SHGetFileInfo("_unknown",
Shell32.FILE_ATTRIBUTE_DIRECTORY,
ref shfi,
(uint)Marshal.SizeOf(shfi),
flags);
if (hSuccess != IntPtr.Zero)
{
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
Icon icon = (Icon)Icon.FromHandle(shfi.hIcon).Clone();
User32.DestroyIcon(shfi.hIcon); // Cleanup
return(icon);
}
return(null);
}
private Icon GetFileIcon(string name, bool isFolder, IconSize size, bool linkOverlay)
{
//by extension
string key = Utils.GetSafeExtension(name);
if (isFolder)
{
key += "-folder";
}
if (linkOverlay)
{
key += "-overlay";
}
int s = size == IconSize.Small ? 16 : 32;
Icon icon = _iconCache.Get(key, s);
if (null == icon)
{
Shell32.SHFILEINFO shfi = new Shell32.SHFILEINFO();
uint flags = Shell32.SHGFI_ICON | Shell32.SHGFI_USEFILEATTRIBUTES;
if (linkOverlay)
{
flags += Shell32.SHGFI_LINKOVERLAY;
}
/* Check the size specified for return. */
if (IconSize.Small == size)
{
flags += Shell32.SHGFI_SMALLICON;
}
else
{
flags += Shell32.SHGFI_LARGEICON;
}
uint fileAttributes = 0;
if (isFolder)
{
fileAttributes = Shell32.FILE_ATTRIBUTE_DIRECTORY;
}
else
{
fileAttributes = Shell32.FILE_ATTRIBUTE_NORMAL;
}
IntPtr hSuccess = Shell32.SHGetFileInfo(name,
fileAttributes,
ref shfi,
(uint)Marshal.SizeOf(shfi),
flags);
if (hSuccess != IntPtr.Zero)
{
// Copy (clone) the returned icon to a new object, thus allowing us to clean-up properly
icon = (Icon)Icon.FromHandle(shfi.hIcon).Clone();
_iconCache.Put(key, icon, s);
// Release icon handle
User32.DestroyIcon(shfi.hIcon);
}
}
return(icon);
}