解決しました！作業コードについては、EDIT 2 を参照してください。
このサイトのコードと同じサイトで freundblase によって行われたコメントに基づいて、ファイル拡張子に基づいてジャンボのデフォルト アイコンを取得する次のクラスがあります。
// Original bad code removed
私は次の方法でクラスを使用しようとしています:
preview.ImageSource = IconManager.GetIcon(".pdf", true);
ここで、プレビューは ImageBrush オブジェクトです。
しかし、次の画像が表示されます。
はい、pdf ファイルなどの登録済みファイル タイプで試しました。
どうしたの？
ティア
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編集1：
アイコンは登録されていないファイルタイプに使用されていると思います。
実際のファイルを使用すると、FileNotFoundException が発生します。
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編集2：
この質問を投稿する前に、ReSharper でコードのクリーンアップを行いました。
サイトのコードと freundblase のコメントに基づいてクラスを再度作成したところ、機能するようになりました。
ReSharper による変更を注意深く分析する必要があります。コードのクリーンアップで問題が発生することはありませんでした。
後世の場合、次のコードが機能します。
public class IconManager
{
// Constants that we need in the function call
private const int SHGFI_ICON = 0x100;
private const int SHGFI_LARGEICON = 0x0;
private const int SHGFI_SMALLICON = 0x1;
private const int SHIL_EXTRALARGE = 0x2;
private const int SHIL_JUMBO = 0x4;
private const int WM_CLOSE = 0x0010;
// This structure will contain information about the file
public struct SHFILEINFO
{
// Handle to the icon representing the file
public IntPtr hIcon;
// Index of the icon within the image list
public int iIcon;
// Various attributes of the file
public uint dwAttributes;
// Path to the file
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)] public string szDisplayName;
// File type
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)] public string szTypeName;
};
[DllImport("Kernel32.dll")]
public static extern Boolean CloseHandle(IntPtr handle);
private struct IMAGELISTDRAWPARAMS
{
public int cbSize;
public IntPtr himl;
public int i;
public IntPtr hdcDst;
public int x;
public int y;
public int cx;
public int cy;
public int xBitmap; // x offest from the upperleft of bitmap
public int yBitmap; // y offset from the upperleft of bitmap
public int rgbBk;
public int rgbFg;
public int fStyle;
public int dwRop;
public int fState;
public int Frame;
public int crEffect;
}
[DllImport("user32")]
private static extern
IntPtr SendMessage(
IntPtr handle,
int Msg,
IntPtr wParam,
IntPtr lParam
);
[StructLayout(LayoutKind.Sequential)]
private struct IMAGEINFO
{
private readonly IntPtr hbmImage;
private readonly IntPtr hbmMask;
private readonly int Unused1;
private readonly int Unused2;
private readonly RECT rcImage;
}
#region Private ImageList COM Interop (XP)
[ComImport]
[Guid("46EB5926-582E-4017-9FDF-E8998DAA0950")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
//helpstring("Image List"),
private interface IImageList
{
[PreserveSig]
int Add(
IntPtr hbmImage,
IntPtr hbmMask,
ref int pi);
[PreserveSig]
int ReplaceIcon(
int i,
IntPtr hicon,
ref int pi);
[PreserveSig]
int SetOverlayImage(
int iImage,
int iOverlay);
[PreserveSig]
int Replace(
int i,
IntPtr hbmImage,
IntPtr hbmMask);
[PreserveSig]
int AddMasked(
IntPtr hbmImage,
int crMask,
ref int pi);
[PreserveSig]
int Draw(
ref IMAGELISTDRAWPARAMS pimldp);
[PreserveSig]
int Remove(
int i);
[PreserveSig]
int GetIcon(
int i,
int flags,
ref IntPtr picon);
[PreserveSig]
int GetImageInfo(
int i,
ref IMAGEINFO pImageInfo);
[PreserveSig]
int Copy(
int iDst,
IImageList punkSrc,
int iSrc,
int uFlags);
[PreserveSig]
int Merge(
int i1,
IImageList punk2,
int i2,
int dx,
int dy,
ref Guid riid,
ref IntPtr ppv);
[PreserveSig]
int Clone(
ref Guid riid,
ref IntPtr ppv);
[PreserveSig]
int GetImageRect(
int i,
ref RECT prc);
[PreserveSig]
int GetIconSize(
ref int cx,
ref int cy);
[PreserveSig]
int SetIconSize(
int cx,
int cy);
[PreserveSig]
int GetImageCount(
ref int pi);
[PreserveSig]
int SetImageCount(
int uNewCount);
[PreserveSig]
int SetBkColor(
int clrBk,
ref int pclr);
[PreserveSig]
int GetBkColor(
ref int pclr);
[PreserveSig]
int BeginDrag(
int iTrack,
int dxHotspot,
int dyHotspot);
[PreserveSig]
int EndDrag();
[PreserveSig]
int DragEnter(
IntPtr hwndLock,
int x,
int y);
[PreserveSig]
int DragLeave(
IntPtr hwndLock);
[PreserveSig]
int DragMove(
int x,
int y);
[PreserveSig]
int SetDragCursorImage(
ref IImageList punk,
int iDrag,
int dxHotspot,
int dyHotspot);
[PreserveSig]
int DragShowNolock(
int fShow);
[PreserveSig]
int GetDragImage(
ref POINT ppt,
ref POINT pptHotspot,
ref Guid riid,
ref IntPtr ppv);
[PreserveSig]
int GetItemFlags(
int i,
ref int dwFlags);
[PreserveSig]
int GetOverlayImage(
int iOverlay,
ref int piIndex);
};
#endregion
///
/// SHGetImageList is not exported correctly in XP. See KB316931
/// http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q316931
/// Apparently (and hopefully) ordinal 727 isn't going to change.
///
[DllImport("shell32.dll", EntryPoint = "#727")]
private static extern int SHGetImageList(
int iImageList,
ref Guid riid,
out IImageList ppv
);
// The signature of SHGetFileInfo (located in Shell32.dll)
[DllImport("Shell32.dll")]
public static extern int SHGetFileInfo(string pszPath, int dwFileAttributes, ref SHFILEINFO psfi, int cbFileInfo,
uint uFlags);
[DllImport("Shell32.dll")]
public static extern int SHGetFileInfo(IntPtr pszPath, uint dwFileAttributes, ref SHFILEINFO psfi,
int cbFileInfo, uint uFlags);
[DllImport("shell32.dll", SetLastError = true)]
private static extern int SHGetSpecialFolderLocation(IntPtr hwndOwner, Int32 nFolder, ref IntPtr ppidl);
[DllImport("user32")]
public static extern int DestroyIcon(IntPtr hIcon);
public struct pair
{
public Icon icon { get; set; }
public IntPtr iconHandleToDestroy { set; get; }
}
public static int DestroyIcon2(IntPtr hIcon)
{
return DestroyIcon(hIcon);
}
private static BitmapSource IconSource(Icon ic)
{
var ic2 = Imaging.CreateBitmapSourceFromHIcon(ic.Handle,
Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
ic2.Freeze();
return ic2;
}
public static BitmapSource IconPath(string FileName, bool small, bool checkDisk, bool addOverlay)
{
var shinfo = new SHFILEINFO();
const uint SHGFI_USEFILEATTRIBUTES = 0x000000010;
const uint SHGFI_LINKOVERLAY = 0x000008000;
uint flags;
if (small)
flags = SHGFI_ICON | SHGFI_SMALLICON;
else
flags = SHGFI_ICON | SHGFI_LARGEICON;
if (!checkDisk)
flags |= SHGFI_USEFILEATTRIBUTES;
if (addOverlay)
flags |= SHGFI_LINKOVERLAY;
var res = SHGetFileInfo(FileName, 0, ref shinfo, Marshal.SizeOf(shinfo), flags);
if (res == 0)
throw (new FileNotFoundException());
var myIcon = Icon.FromHandle(shinfo.hIcon);
var bs = IconSource(myIcon);
myIcon.Dispose();
bs.Freeze(); // importantissimo se no fa memory leak
DestroyIcon(shinfo.hIcon);
CloseHandle(shinfo.hIcon);
return bs;
}
public static BitmapSource GetLargeIcon(string FileName, bool jumbo, bool checkDisk)
{
var shinfo = new SHFILEINFO();
const uint SHGFI_USEFILEATTRIBUTES = 0x000000010;
const uint SHGFI_SYSICONINDEX = 0x4000;
const int FILE_ATTRIBUTE_NORMAL = 0x80;
var flags = SHGFI_SYSICONINDEX;
if (!checkDisk) // This does not seem to work. If I try it, a folder icon is always returned.
flags |= SHGFI_USEFILEATTRIBUTES;
var res = SHGetFileInfo(FileName, FILE_ATTRIBUTE_NORMAL, ref shinfo, Marshal.SizeOf(shinfo), flags);
if (res == 0)
throw (new FileNotFoundException());
var iconIndex = shinfo.iIcon;
// Get the System IImageList object from the Shell:
var iidImageList = new Guid("46EB5926-582E-4017-9FDF-E8998DAA0950");
IImageList iml;
var size = jumbo ? SHIL_JUMBO : SHIL_EXTRALARGE;
SHGetImageList(size, ref iidImageList, out iml);
var hIcon = IntPtr.Zero;
const int ILD_TRANSPARENT = 1;
iml.GetIcon(iconIndex, ILD_TRANSPARENT, ref hIcon);
var myIcon = Icon.FromHandle(hIcon);
var bs = IconSource(myIcon);
myIcon.Dispose();
bs.Freeze(); // very important to avoid memory leak
DestroyIcon(hIcon);
SendMessage(hIcon, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
return bs;
}
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
private readonly int _Left;
private readonly int _Top;
private readonly int _Right;
private readonly int _Bottom;
}
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
public int X;
public int Y;
public POINT(int x, int y)
{
X = x;
Y = y;
}
public static implicit operator Point(POINT p)
{
return new Point(p.X, p.Y);
}
public static implicit operator POINT(Point p)
{
return new POINT(p.X, p.Y);
}
}
}