public static Icon GetIcon( IntPtr pidl, bool selected, ImageList imageList )
{
SH.SHFILEINFO shfi = new SH.SHFILEINFO();
int cbFileInfo = Marshal.SizeOf(shfi);
SH.SHGFI flags = SH.SHGFI.PIDL;
if (!selected)
flags = flags | SH.SHGFI.ICON | SH.SHGFI.SMALLICON;
else
flags = flags | SH.SHGFI.ICON | SH.SHGFI.SMALLICON | SH.SHGFI.OPENICON;
Icon icon = null;
try
{
SH.SHGetFileInfo( pidl, 0, ref shfi, (uint)cbFileInfo, flags );
if( shfi.hIcon == IntPtr.Zero )
return null;
icon = (Icon)Icon.FromHandle( shfi.hIcon ).Clone( );
Api.DestroyIcon( shfi.hIcon );
}
catch
{
}
return icon;
}
private void Create( )
{
// forget last image list if any:
_hIml = IntPtr.Zero;
if( isXpOrAbove( ) )
{
// Get the System IImageList object from the Shell:
Guid iidImageList = new Guid( "46EB5926-582E-4017-9FDF-E8998DAA0950" );
int ret = SH.SHGetImageList(
(int)_size,
ref iidImageList,
ref _iImageList
);
// the image list handle is the IUnknown pointer, but
// using Marshal.GetIUnknownForObject doesn't return
// the right value. It really doesn't hurt to make
// a second call to get the handle:
SH.SHGetImageListHandle( (int)_size, ref iidImageList, ref _hIml );
}
else
{
// Prepare flags:
SH.SHGFI dwFlags = SH.SHGFI.USEFILEATTRIBUTES | SH.SHGFI.SYSICONINDEX;
if( _size == SystemImageListSize.SmallIcons )
{
dwFlags |= SH.SHGFI.SMALLICON;
}
// Get image list
SH.SHFILEINFO shfi = new SH.SHFILEINFO( );
uint shfiSize = (uint)Marshal.SizeOf( shfi.GetType( ) );
// Call SHGetFileInfo to get the image list handle
// using an arbitrary file:
_hIml = SH.SHGetFileInfo(
".txt",
SH.FILE_ATTRIBUTE_NORMAL,
ref shfi,
shfiSize,
dwFlags );
Debug.Assert( ( _hIml != IntPtr.Zero ), "Failed to create Image List" );
}
}
/// <summary>
/// Returns the index of the icon for the specified file
/// </summary>
/// <param name="fileName">Filename to get icon for</param>
/// <param name="forceLoadFromDisk">If True, then hit the disk to get the icon,
/// otherwise only hit the disk if no cached icon is available.</param>
/// <param name="iconState">Flags specifying the state of the icon returned.</param>
/// <returns>Index of the icon</returns>
public int IconIndex( string fileName, bool forceLoadFromDisk, ShellIconStateConstants iconState )
{
uint dwAttr = 0;
SH.SHGFI dwFlags = SH.SHGFI.SYSICONINDEX;
if (_size == SystemImageListSize.SmallIcons)
{
dwFlags |= SH.SHGFI.SMALLICON;
}
// ディスクアクセスするか選択できます。
// ディスクをヒットしないなら、アイコンがキャッシュされていないとおかしなアイコンを得ます。
// これはファイルについてだけ機能します。
if (!forceLoadFromDisk)
{
dwAttr = SH.FILE_ATTRIBUTE_NORMAL;
dwFlags |= SH.SHGFI.USEFILEATTRIBUTES;
}
// sFileSpec can be any file. You can specify a
// file that does not exist and still get the
// icon, for example sFileSpec = "C:\PANTS.DOC"
SH.SHFILEINFO shfi = new SH.SHFILEINFO();
uint shfiSize = (uint) Marshal.SizeOf(shfi.GetType());
IntPtr retVal = SH.SHGetFileInfo(
fileName, dwAttr, ref shfi, shfiSize,
(SH.SHGFI)((uint) (dwFlags) | (uint) iconState));
if (retVal.Equals(IntPtr.Zero))
{
Debug.Assert((!retVal.Equals(IntPtr.Zero)), "Failed to get icon index");
return 0;
}
else
{
return shfi.iIcon;
}
}
