mirror of https://github.com/dahall/Vanara.git
93 lines
4.2 KiB
C#
93 lines
4.2 KiB
C#
using System;
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using System.Threading.Tasks;
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using Vanara.Extensions;
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using Vanara.PInvoke;
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using static Vanara.PInvoke.Gdi32;
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using static Vanara.PInvoke.Shell32;
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using static Vanara.PInvoke.Shell32.ShellUtil;
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using static Vanara.PInvoke.User32;
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namespace Vanara.Windows.Shell
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{
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/// <summary>Exposes methods that get images related to shell items.</summary>
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public class ShellItemImages
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{
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private readonly ShellItem shellItem;
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/// <summary>Initializes a new instance of the <see cref="ShellItemImages"/> class.</summary>
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/// <param name="shellItem">The <see cref="ShellItem"/> instance.</param>
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public ShellItemImages(ShellItem shellItem) => this.shellItem = shellItem;
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/// <summary>
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/// Gets an image that represents this item. The default behavior is to load a thumbnail. If there is no thumbnail for the current
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/// item, it retrieves the icon of the item. The thumbnail or icon is extracted if it is not currently cached.
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/// </summary>
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/// <param name="size">A structure that specifies the size of the image to be received.</param>
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/// <param name="flags">One or more of the option flags.</param>
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/// <param name="forcePreVista">If set to <see langword="true"/>, ignore the use post vista interfaces like <see cref="IShellItemImageFactory"/>.</param>
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/// <returns>The resulting image.</returns>
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/// <exception cref="PlatformNotSupportedException"></exception>
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public SafeHBITMAP GetImage(SIZE size, ShellItemGetImageOptions flags = 0, bool forcePreVista = false)
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{
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SafeHBITMAP hbmp = SafeHBITMAP.Null;
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HRESULT hr = HRESULT.E_FAIL;
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var sz = (uint)size.Width;
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if (!forcePreVista && ShellItem.IsMinVista)
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{
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if (shellItem.IShellItem is IShellItemImageFactory fctry)
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{
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hr = fctry.GetImage(size, (SIIGBF)flags, out hbmp);
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if (hr == 0x8004B200 && flags.IsFlagSet(ShellItemGetImageOptions.ThumbnailOnly))
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throw new InvalidOperationException("Thumbnails are not supported by this item.");
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if (hr.Succeeded)
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return hbmp;
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}
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//hr = LoadImageFromThumbnailProvider(shellItem.IShellItem, ref sz, out hbmp);
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}
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// If before Vista, or if Vista interfaces failed, try using IExtractImage and IExtractIcon
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var isf = shellItem.Parent?.IShellFolder;
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if (hr != HRESULT.S_OK && !flags.IsFlagSet(ShellItemGetImageOptions.IconOnly) && isf is not null)
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hr = LoadImageFromExtractImage(isf, shellItem.PIDL.LastId, ref sz, out hbmp);
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if (hr != HRESULT.S_OK && isf is not null)
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{
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if (!flags.IsFlagSet(ShellItemGetImageOptions.ThumbnailOnly))
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{
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LoadIconFromExtractIcon(isf, shellItem.PIDL.LastId, ref sz, out SafeHICON hIcon).ThrowIfFailed();
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using (hIcon)
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hbmp = hIcon.ToHBITMAP();
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}
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else
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{
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throw hr.GetException()!;
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}
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}
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// If you got a bitmap, resize based on flags
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if (sz == size.Width || sz > size.Width && flags.IsFlagSet(ShellItemGetImageOptions.BiggerSizeOk))
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return hbmp;
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if (sz > size.Width && flags.IsFlagSet(ShellItemGetImageOptions.ResizeToFit) || sz < size.Width && flags.IsFlagSet(ShellItemGetImageOptions.ScaleUp))
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{
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HANDLE hbmpcp = CopyImage(hbmp.DangerousGetHandle(), LoadImageType.IMAGE_BITMAP, size.Width, size.Height, CopyImageOptions.LR_CREATEDIBSECTION);
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if (hbmpcp.IsNull) Win32Error.ThrowLastError();
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hbmp.Dispose();
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hbmp = new SafeHBITMAP((IntPtr)hbmpcp, true);
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}
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return hbmp;
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}
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/// <summary>
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/// Gets an image that represents this item. The default behavior is to load a thumbnail. If there is no thumbnail for the current
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/// item, it retrieves the icon of the item. The thumbnail or icon is extracted if it is not currently cached.
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/// </summary>
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/// <param name="size">A structure that specifies the size of the image to be received.</param>
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/// <param name="flags">One or more of the option flags.</param>
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/// <param name="forcePreVista">If set to <see langword="true"/>, ignore the use post vista interfaces like <see cref="IShellItemImageFactory"/>.</param>
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/// <returns>The resulting image.</returns>
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/// <exception cref="PlatformNotSupportedException"></exception>
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public async Task<SafeHBITMAP> GetImageAsync(SIZE size, ShellItemGetImageOptions flags = 0, bool forcePreVista = false) => await TaskAgg.Run(() =>
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GetImage(size, flags, forcePreVista), System.Threading.CancellationToken.None);
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}
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} |