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using System ;
using System.Drawing ;
using static Vanara . PInvoke . ComCtl32 ;
using static Vanara . PInvoke . Shell32 ;
namespace Vanara.Windows.Shell
{
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/// <summary>Used to determine the size of the icon returned by <see cref="ShellImageList.GetSystemIcon"/>.</summary>
public enum ShellImageSize
{
/// <summary>
/// The image size is normally 32x32 pixels. However, if the Use large icons option is selected from the Effects section of the Appearance tab in
/// Display Properties, the image is 48x48 pixels.
/// </summary>
Large = SHIL . SHIL_LARGE ,
/// <summary>The image is the Shell standard small icon size of 16x16, but the size can be customized by the user.</summary>
Small = SHIL . SHIL_SMALL ,
/// <summary>The image is the Shell standard extra-large icon size. This is typically 48x48, but the size can be customized by the user.</summary>
ExtraLarge = SHIL . SHIL_EXTRALARGE ,
/// <summary>Windows Vista and later. The image is normally 256x256 pixels.</summary>
Jumbo = SHIL . SHIL_JUMBO
}
/// <summary>Represents the System Image List holding images for all shell icons.</summary>
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public static class ShellImageList
{
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private static int shfiSz = SHFILEINFO . Size ;
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/// <summary>Gets the system icon for the given file name or extension.</summary>
/// <param name="fileNameOrExtension">The file name or extension.</param>
/// <param name="iconSize">Size of the icon.</param>
/// <returns>An <see cref="Icon"/> instance if found; otherwise <see langword="null"/>.</returns>
public static Icon GetSystemIcon ( string fileNameOrExtension , ShellImageSize iconSize = ShellImageSize . Large )
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{
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var shfi = new SHFILEINFO ( ) ;
var hImageList = SHGetFileInfo ( fileNameOrExtension , 0 , ref shfi , shfiSz , SHGFI . SHGFI_SYSICONINDEX | ( iconSize = = ShellImageSize . Small ? SHGFI . SHGFI_SMALLICON : 0 ) ) ;
if ( hImageList = = IntPtr . Zero ) return null ;
if ( iconSize < = ShellImageSize . Small )
return IconLocation . GetClonedIcon ( ImageList_GetIcon ( hImageList , shfi . iIcon , IMAGELISTDRAWFLAGS . ILD_TRANSPARENT ) ) ;
SHGetImageList ( ( SHIL ) iconSize , typeof ( IImageList ) . GUID , out var il ) . ThrowIfFailed ( ) ;
return IconLocation . GetClonedIcon ( il . GetIcon ( shfi . iIcon , IMAGELISTDRAWFLAGS . ILD_TRANSPARENT ) ) ;
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}
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/// <summary>Gets the Shell icon for the given file name or extension.</summary>
/// <param name="fileNameOrExtension">The file name or extension .</param>
/// <param name="iconType">Flags to specify the type of the icon to retrieve. This uses the <see cref="SHGetFileInfo(string, System.IO.FileAttributes, ref SHFILEINFO, int, SHGFI)"/> method and can only retrieve small or large icons.</param>
/// <returns>An <see cref="Icon"/> instance if found; otherwise <see langword="null"/>.</returns>
public static Icon GetFileIcon ( string fileNameOrExtension , ShellIconType iconType = ShellIconType . Large )
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{
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const SHGFI baseFlags = SHGFI . SHGFI_USEFILEATTRIBUTES | SHGFI . SHGFI_ICON ;
var shfi = new SHFILEINFO ( ) ;
var ret = SHGetFileInfo ( fileNameOrExtension , 0 , ref shfi , shfiSz , baseFlags | ( SHGFI ) iconType ) ;
if ( ret = = IntPtr . Zero )
ret = SHGetFileInfo ( fileNameOrExtension , 0 , ref shfi , shfiSz , SHGFI . SHGFI_ICON | ( SHGFI ) iconType ) ;
return ret = = IntPtr . Zero ? null : IconLocation . GetClonedIcon ( shfi . hIcon ) ;
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}
}
}