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126 lines
3.8 KiB
C#
126 lines
3.8 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Security;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace GeoSigmaViewer
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{
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public class CursorResourceLoader
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{
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#region Methods
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public static Cursor LoadEmbeddedCursor(byte[] cursorResource, int imageIndex = 0)
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{
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var resourceHandle = GCHandle.Alloc(cursorResource, GCHandleType.Pinned);
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var iconImage = IntPtr.Zero;
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var cursorHandle = IntPtr.Zero;
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try
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{
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var header = (IconHeader)Marshal.PtrToStructure(resourceHandle.AddrOfPinnedObject(), typeof(IconHeader));
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if (imageIndex >= header.count)
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throw new ArgumentOutOfRangeException("imageIndex");
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var iconInfoPtr = resourceHandle.AddrOfPinnedObject() + Marshal.SizeOf(typeof(IconHeader)) + imageIndex * Marshal.SizeOf(typeof(IconInfo));
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var info = (IconInfo)Marshal.PtrToStructure(iconInfoPtr, typeof(IconInfo));
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iconImage = Marshal.AllocHGlobal(info.size + 4);
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Marshal.WriteInt16(iconImage + 0, info.hotspot_x);
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Marshal.WriteInt16(iconImage + 2, info.hotspot_y);
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Marshal.Copy(cursorResource, info.offset, iconImage + 4, info.size);
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cursorHandle = NativeMethods.CreateIconFromResource(iconImage, info.size + 4, false, 0x30000);
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return new Cursor(cursorHandle);
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}
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finally
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{
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if (cursorHandle != IntPtr.Zero)
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NativeMethods.DestroyIcon(cursorHandle);
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if (iconImage != IntPtr.Zero)
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Marshal.FreeHGlobal(iconImage);
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if (resourceHandle.IsAllocated)
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resourceHandle.Free();
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}
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}
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#endregion Methods
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#region Native Methods
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[SuppressUnmanagedCodeSecurity]
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static class NativeMethods
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{
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[DllImportAttribute("user32.dll", CharSet = CharSet.Unicode)]
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[return: MarshalAs(UnmanagedType.Bool)]
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public static extern bool DestroyIcon(IntPtr hIcon);
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[DllImport("user32.dll", SetLastError = true)]
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public static extern IntPtr CreateIconFromResource(IntPtr pbIconBits, int dwResSize, bool fIcon, int dwVer);
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}
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#endregion Native Methods
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#region Native Structures
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[StructLayout(LayoutKind.Explicit, Pack = 1)]
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struct IconHeader
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{
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[FieldOffset(0)]
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public short reserved;
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[FieldOffset(2)]
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public short type;
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[FieldOffset(4)]
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public short count;
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}
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/// <summary>Union structure for icons and cursors.</summary>
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/// <remarks>For icons, field offset 4 is used for planes and field offset 6 for
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/// bits-per-pixel, while for cursors field offset 4 is used for the x coordinate
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/// of the hotspot, and field offset 6 is used for the y coordinate.</remarks>
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[StructLayout(LayoutKind.Explicit, Pack = 1)]
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struct IconInfo
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{
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[FieldOffset(0)]
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public byte width;
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[FieldOffset(1)]
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public byte height;
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[FieldOffset(2)]
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public byte colors;
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[FieldOffset(3)]
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public byte reserved;
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[FieldOffset(4)]
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public short planes;
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[FieldOffset(6)]
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public short bpp;
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[FieldOffset(4)]
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public short hotspot_x;
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[FieldOffset(6)]
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public short hotspot_y;
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[FieldOffset(8)]
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public int size;
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[FieldOffset(12)]
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public int offset;
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}
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#endregion Native Structures
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}
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}
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