mirror of https://github.com/dahall/Vanara.git
125 lines
6.6 KiB
C#
125 lines
6.6 KiB
C#
using System;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace Vanara.PInvoke
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{
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public static partial class Shell32
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{
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/// <summary>Flags used by <see cref="IExtractIcon.GetIconLocation(GetIconLocationFlags, StringBuilder, int, out int, out GetIconLocationResultFlags)"/>.</summary>
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[Flags]
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public enum GetIconLocationFlags : uint
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{
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/// <summary>
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/// Set this flag to determine whether the icon should be extracted asynchronously. If the icon can be extracted rapidly, this
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/// flag is usually ignored. If extraction will take more time, GetIconLocation should return E_PENDING. See the Remarks for
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/// further discussion.
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/// </summary>
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GIL_ASYNC = 0x0020,
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/// <summary>
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/// Retrieve information about the fallback icon. Fallback icons are usually used while the desired icon is extracted and added
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/// to the cache.
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/// </summary>
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GIL_DEFAULTICON = 0x0040,
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/// <summary>The icon is displayed in a Shell folder.</summary>
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GIL_FORSHELL = 0x0002,
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/// <summary>
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/// The icon indicates a shortcut. However, the icon extractor should not apply the shortcut overlay; that will be done later.
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/// Shortcut icons are state-independent.
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/// </summary>
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GIL_FORSHORTCUT = 0x0080,
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/// <summary>
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/// The icon is in the open state if both open-state and closed-state images are available. If this flag is not specified, the
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/// icon is in the normal or closed state. This flag is typically used for folder objects.
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/// </summary>
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GIL_OPENICON = 0x0001,
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/// <summary>Explicitly return either GIL_SHIELD or GIL_FORCENOSHIELD in pwFlags. Do not block if GIL_ASYNC is set.</summary>
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GIL_CHECKSHIELD = 0x0200
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}
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/// <summary>
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/// Flags returned by <see cref="IExtractIcon.GetIconLocation(GetIconLocationFlags, StringBuilder, int, out int, out GetIconLocationResultFlags)"/>.
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/// </summary>
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[Flags]
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public enum GetIconLocationResultFlags : uint
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{
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/// <summary>The physical image bits for this icon are not cached by the calling application.</summary>
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GIL_DONTCACHE = 0x0010,
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/// <summary>
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/// The location is not a file name/index pair. The values in pszIconFile and piIndex cannot be passed to ExtractIcon or
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/// ExtractIconEx. When this flag is omitted, the value returned in pszIconFile is a fully-qualified path name to either a .ico
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/// file or to a file that can contain icons. Also, the value returned in piIndex is an index into that file that identifies
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/// which of its icons to use. Therefore, when the GIL_NOTFILENAME flag is omitted, these values can be passed to ExtractIcon or ExtractIconEx.
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/// </summary>
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GIL_NOTFILENAME = 0x0008,
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/// <summary>
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/// All objects of this class have the same icon. This flag is used internally by the Shell. Typical implementations of
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/// IExtractIcon do not require this flag because the flag implies that an icon handler is not required to resolve the icon on a
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/// per-object basis. The recommended method for implementing per-class icons is to register a DefaultIcon for the class.
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/// </summary>
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GIL_PERCLASS = 0x0004,
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/// <summary>
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/// Each object of this class has its own icon. This flag is used internally by the Shell to handle cases like Setup.exe, where
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/// objects with identical names can have different icons. Typical implementations of IExtractIcon do not require this flag.
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/// </summary>
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GIL_PERINSTANCE = 0x0002,
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/// <summary>The calling application should create a document icon using the specified icon.</summary>
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GIL_SIMULATEDOC = 0x0001,
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/// <summary>Windows Vista only. The calling application must stamp the icon with the UAC shield.</summary>
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GIL_SHIELD = 0x0200, //Windows Vista only
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/// <summary>Windows Vista only. The calling application must not stamp the icon with the UAC shield.</summary>
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GIL_FORCENOSHIELD = 0x0400 //Windows Vista only
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}
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/// <summary>Exposes methods that allow a client to retrieve the icon that is associated with one of the objects in a folder.</summary>
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// https://msdn.microsoft.com/en-us/library/windows/desktop/bb761854(v=vs.85).aspx
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[PInvokeData("Shlobj_core.h", MSDNShortId = "bb761854")]
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[ComImport, Guid("000214fa-0000-0000-c000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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public interface IExtractIcon
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{
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/// <summary>Gets the location and index of an icon.</summary>
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/// <param name="uFlags">One or more of the following values. This parameter can also be NULL.use GIL_ Consts</param>
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/// <param name="szIconFile">
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/// A pointer to a buffer that receives the icon location. The icon location is a null-terminated string that identifies the file
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/// that contains the icon.
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/// </param>
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/// <param name="cchMax">The size of the buffer, in characters, pointed to by pszIconFile.</param>
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/// <param name="piIndex">A pointer to an int that receives the index of the icon in the file pointed to by pszIconFile.</param>
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/// <param name="pwFlags">A pointer to a UINT value that receives zero or a combination of the following value</param>
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/// <returns>
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/// Returns S_OK if the function returned a valid location, or S_FALSE if the Shell should use a default icon. If the GIL_ASYNC
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/// flag is set in uFlags, the method can return E_PENDING to indicate that icon extraction will be time-consuming.
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/// </returns>
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[PreserveSig]
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HRESULT GetIconLocation(GetIconLocationFlags uFlags, StringBuilder szIconFile, int cchMax, out int piIndex, out GetIconLocationResultFlags pwFlags);
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/// <summary>Extracts an icon image from the specified location.</summary>
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/// <param name="pszFile">A pointer to a null-terminated string that specifies the icon location.</param>
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/// <param name="nIconIndex">The index of the icon in the file pointed to by pszFile.</param>
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/// <param name="phiconLarge">
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/// A pointer to an HICON value that receives the handle to the large icon. This parameter may be NULL.
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/// </param>
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/// <param name="phiconSmall">
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/// A pointer to an HICON value that receives the handle to the small icon. This parameter may be NULL.
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/// </param>
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/// <param name="nIconSize">
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/// The desired size of the icon, in pixels. The low word contains the size of the large icon, and the high word contains the
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/// size of the small icon. The size specified can be the width or height. The width of an icon always equals its height.
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/// </param>
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/// <returns>Returns S_OK if the function extracted the icon, or S_FALSE if the calling application should extract the icon.</returns>
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void Extract([MarshalAs(UnmanagedType.LPTStr)] string pszFile, uint nIconIndex, out IntPtr phiconLarge,
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out IntPtr phiconSmall, uint nIconSize);
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}
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}
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} |