initial checkin of yaulw (locally)
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Donald Duck
249
Installer/FileIcon.cs
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249
Installer/FileIcon.cs
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Runtime.InteropServices;
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using System.Drawing;
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namespace Yaulw.Installer
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{
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/// <summary>
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/// Enables extraction of icons for any file type from
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/// the Shell.
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/// </summary>
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/// <seealso cref="http://www.vbaccelerator.com/home/NET/Code/Libraries/Shell_Projects/Creating_and_Modifying_Shortcuts/ShellLink_Code_zip_ShellLink/FileIcon_cs.asp"/>
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public class FileIcon
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{
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#region UnmanagedCode
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private const int MAX_PATH = 260;
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[StructLayout(LayoutKind.Sequential)]
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private struct SHFILEINFO
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{
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public IntPtr hIcon;
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public int iIcon;
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public int dwAttributes;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = MAX_PATH)]
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public string szDisplayName;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
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public string szTypeName;
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}
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[DllImport("shell32")]
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private static extern int SHGetFileInfo(
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string pszPath,
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int dwFileAttributes,
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ref SHFILEINFO psfi,
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uint cbFileInfo,
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uint uFlags);
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[DllImport("user32.dll")]
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private static extern int DestroyIcon(IntPtr hIcon);
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private const int FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x100;
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private const int FORMAT_MESSAGE_ARGUMENT_ARRAY = 0x2000;
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private const int FORMAT_MESSAGE_FROM_HMODULE = 0x800;
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private const int FORMAT_MESSAGE_FROM_STRING = 0x400;
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private const int FORMAT_MESSAGE_FROM_SYSTEM = 0x1000;
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private const int FORMAT_MESSAGE_IGNORE_INSERTS = 0x200;
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private const int FORMAT_MESSAGE_MAX_WIDTH_MASK = 0xFF;
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[DllImport("kernel32")]
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private extern static int FormatMessage(
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int dwFlags,
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IntPtr lpSource,
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int dwMessageId,
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int dwLanguageId,
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string lpBuffer,
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uint nSize,
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int argumentsLong);
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[DllImport("kernel32")]
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private extern static int GetLastError();
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#endregion
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#region Member Variables
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private string fileName;
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private string displayName;
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private string typeName;
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private SHGetFileInfoConstants flags;
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private Icon fileIcon;
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#endregion
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#region Enumerations
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[Flags]
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public enum SHGetFileInfoConstants : int
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{
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SHGFI_ICON = 0x100, // get icon
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SHGFI_DISPLAYNAME = 0x200, // get display name
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SHGFI_TYPENAME = 0x400, // get type name
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SHGFI_ATTRIBUTES = 0x800, // get attributes
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SHGFI_ICONLOCATION = 0x1000, // get icon location
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SHGFI_EXETYPE = 0x2000, // return exe type
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SHGFI_SYSICONINDEX = 0x4000, // get system icon index
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SHGFI_LINKOVERLAY = 0x8000, // put a link overlay on icon
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SHGFI_SELECTED = 0x10000, // show icon in selected state
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SHGFI_ATTR_SPECIFIED = 0x20000, // get only specified attributes
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SHGFI_LARGEICON = 0x0, // get large icon
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SHGFI_SMALLICON = 0x1, // get small icon
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SHGFI_OPENICON = 0x2, // get open icon
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SHGFI_SHELLICONSIZE = 0x4, // get shell size icon
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//SHGFI_PIDL = 0x8, // pszPath is a pidl
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SHGFI_USEFILEATTRIBUTES = 0x10, // use passed dwFileAttribute
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SHGFI_ADDOVERLAYS = 0x000000020, // apply the appropriate overlays
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SHGFI_OVERLAYINDEX = 0x000000040 // Get the index of the overlay
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}
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#endregion
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#region Implementation
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/// <summary>
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/// Gets/sets the flags used to extract the icon
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/// </summary>
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public FileIcon.SHGetFileInfoConstants Flags
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{
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get
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{
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return flags;
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}
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set
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{
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flags = value;
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}
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}
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/// <summary>
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/// Gets/sets the filename to get the icon for
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/// </summary>
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public string FileName
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{
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get
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{
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return fileName;
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}
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set
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{
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fileName = value;
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}
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}
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/// <summary>
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/// Gets the icon for the chosen file
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/// </summary>
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public Icon ShellIcon
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{
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get
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{
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return fileIcon;
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}
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}
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/// <summary>
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/// Gets the display name for the selected file
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/// if the SHGFI_DISPLAYNAME flag was set.
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/// </summary>
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public string DisplayName
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{
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get
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{
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return displayName;
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}
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}
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/// <summary>
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/// Gets the type name for the selected file
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/// if the SHGFI_TYPENAME flag was set.
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/// </summary>
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public string TypeName
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{
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get
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{
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return typeName;
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}
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}
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/// <summary>
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/// Gets the information for the specified
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/// file name and flags.
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/// </summary>
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public void GetInfo()
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{
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fileIcon = null;
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typeName = "";
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displayName = "";
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SHFILEINFO shfi = new SHFILEINFO();
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uint shfiSize = (uint)Marshal.SizeOf(shfi.GetType());
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int ret = SHGetFileInfo(
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fileName, 0, ref shfi, shfiSize, (uint)(flags));
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if (ret != 0)
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{
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if (shfi.hIcon != IntPtr.Zero)
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{
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fileIcon = System.Drawing.Icon.FromHandle(shfi.hIcon);
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// Now owned by the GDI+ object
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//DestroyIcon(shfi.hIcon);
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}
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typeName = shfi.szTypeName;
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displayName = shfi.szDisplayName;
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}
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else
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{
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int err = GetLastError();
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Console.WriteLine("Error {0}", err);
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string txtS = new string('\0', 256);
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int len = FormatMessage(
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FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
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IntPtr.Zero, err, 0, txtS, 256, 0);
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Console.WriteLine("Len {0} text {1}", len, txtS);
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// throw exception
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}
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}
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/// <summary>
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/// Constructs a new, default instance of the FileIcon
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/// class. Specify the filename and call GetInfo()
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/// to retrieve an icon.
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/// </summary>
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public FileIcon()
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{
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flags = SHGetFileInfoConstants.SHGFI_ICON |
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SHGetFileInfoConstants.SHGFI_DISPLAYNAME |
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SHGetFileInfoConstants.SHGFI_TYPENAME |
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SHGetFileInfoConstants.SHGFI_ATTRIBUTES |
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SHGetFileInfoConstants.SHGFI_EXETYPE;
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}
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/// <summary>
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/// Constructs a new instance of the FileIcon class
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/// and retrieves the icon, display name and type name
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/// for the specified file.
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/// </summary>
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/// <param name="fileName">The filename to get the icon,
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/// display name and type name for</param>
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public FileIcon(string fileName)
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: this()
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{
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this.fileName = fileName;
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GetInfo();
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}
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/// <summary>
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/// Constructs a new instance of the FileIcon class
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/// and retrieves the information specified in the
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/// flags.
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/// </summary>
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/// <param name="fileName">The filename to get information
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/// for</param>
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/// <param name="flags">The flags to use when extracting the
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/// icon and other shell information.</param>
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public FileIcon(string fileName, FileIcon.SHGetFileInfoConstants flags)
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{
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this.fileName = fileName;
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this.flags = flags;
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GetInfo();
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}
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#endregion
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}
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}
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