DeskCore 1.0.0

Desktop-Icons in eigene Kategorien sortieren: Windows-11-Design (hell/dunkel), Desktop-Boxen, automatisches Einsortieren nach Regeln, Rückgängig, Suche, Infobereich mit Tastenkürzel, Sicherung als ZIP und Installer ohne Adminrechte. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-01 20:19:32 +02:00
commit 77bb3e6b9d
36 changed files with 5894 additions and 0 deletions
@@ -0,0 +1,100 @@
+using System.Runtime.InteropServices;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+
+namespace DeskCore;
+
+/// <summary>Holt das Icon (bzw. Vorschaubild) einer Datei so, wie der Explorer es anzeigt.</summary>
+public static class ShellIcon
+{
+    public static ImageSource? Get(string path, int size = 64)
+    {
+        IntPtr hbm = IntPtr.Zero;
+        try
+        {
+            SHCreateItemFromParsingName(path, IntPtr.Zero, typeof(IShellItemImageFactory).GUID, out var factory);
+            int hr = factory.GetImage(new SIZE { cx = size, cy = size }, 0, out hbm);
+            Marshal.ReleaseComObject(factory);
+            if (hr != 0 || hbm == IntPtr.Zero) return null;
+            return FromHBitmap(hbm);
+        }
+        catch
+        {
+            return null;
+        }
+        finally
+        {
+            if (hbm != IntPtr.Zero) DeleteObject(hbm);
+        }
+    }
+
+    // CreateBitmapSourceFromHBitmap verliert den Alphakanal, daher Pixel selbst kopieren.
+    private static BitmapSource? FromHBitmap(IntPtr hbm)
+    {
+        GetObject(hbm, Marshal.SizeOf<BITMAP>(), out BITMAP bm);
+        int w = bm.bmWidth, h = Math.Abs(bm.bmHeight);
+        if (w <= 0 || h <= 0) return null;
+
+        var bmi = new BITMAPINFOHEADER
+        {
+            biSize = Marshal.SizeOf<BITMAPINFOHEADER>(),
+            biWidth = w,
+            biHeight = -h, // top-down
+            biPlanes = 1,
+            biBitCount = 32,
+        };
+        var bits = new byte[w * h * 4];
+        IntPtr hdc = GetDC(IntPtr.Zero);
+        try
+        {
+            if (GetDIBits(hdc, hbm, 0, (uint)h, bits, ref bmi, 0) == 0) return null;
+        }
+        finally
+        {
+            ReleaseDC(IntPtr.Zero, hdc);
+        }
+
+        bool hasAlpha = false;
+        for (int i = 3; i < bits.Length; i += 4)
+            if (bits[i] != 0) { hasAlpha = true; break; }
+
+        var src = BitmapSource.Create(w, h, 96, 96, hasAlpha ? PixelFormats.Pbgra32 : PixelFormats.Bgr32, null, bits, w * 4);
+        src.Freeze();
+        return src;
+    }
+
+    [ComImport, Guid("bcc18b79-ba16-442f-80c4-8a59c30c463b"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    private interface IShellItemImageFactory
+    {
+        [PreserveSig] int GetImage(SIZE size, int flags, out IntPtr phbm);
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    private struct SIZE { public int cx, cy; }
+
+    [StructLayout(LayoutKind.Sequential)]
+    private struct BITMAP
+    {
+        public int bmType, bmWidth, bmHeight, bmWidthBytes;
+        public ushort bmPlanes, bmBitsPixel;
+        public IntPtr bmBits;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    private struct BITMAPINFOHEADER
+    {
+        public int biSize, biWidth, biHeight;
+        public ushort biPlanes, biBitCount;
+        public int biCompression, biSizeImage, biXPelsPerMeter, biYPelsPerMeter, biClrUsed, biClrImportant;
+    }
+
+    [DllImport("shell32.dll", CharSet = CharSet.Unicode, PreserveSig = false)]
+    private static extern void SHCreateItemFromParsingName(string path, IntPtr pbc,
+        [MarshalAs(UnmanagedType.LPStruct)] Guid riid, out IShellItemImageFactory ppv);
+
+    [DllImport("gdi32.dll")] private static extern bool DeleteObject(IntPtr h);
+    [DllImport("gdi32.dll")] private static extern int GetObject(IntPtr h, int size, out BITMAP bm);
+    [DllImport("gdi32.dll")] private static extern int GetDIBits(IntPtr hdc, IntPtr hbm, uint start, uint lines, byte[] bits, ref BITMAPINFOHEADER bmi, uint usage);
+    [DllImport("user32.dll")] private static extern IntPtr GetDC(IntPtr hwnd);
+    [DllImport("user32.dll")] private static extern int ReleaseDC(IntPtr hwnd, IntPtr hdc);
+}