要在ListView中使用很多种图标，怎么办？
我在做一个文件浏览器，主要用ListView实现。控制ListView中项目的图标只能用ImageList，然后指定ImageIndex,我希望能和Windows的文件浏览器那样，对于不同的文件类型用不同的图标，最好是运行是把图标读出来，请问要怎么办？
以前都是预先把几种常见的文件类型的图标加到ImageList中，但我希望能像Explorer那样。
问题点数：50、回复次数：7Top
1 楼chinchy（糟老头）回复于 2003-03-04 09:15:22 得分 20
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Runtime.InteropServices;
namespace ListView
{
/// <summary>
/// Provides static methods to read system icons for both folders and files.
/// </summary>
/// <example>
/// <code>IconReader.GetFileIcon("c:\\general.xls");</code>
/// </example>
public class IconReader
{
/// <summary>
/// Options to specify the size of icons to return.
/// </summary>
public enum IconSize
{
/// <summary>
/// Specify large icon - 32 pixels by 32 pixels.
/// </summary>
Large = 0,
/// <summary>
/// Specify small icon - 16 pixels by 16 pixels.
/// </summary>
Small = 1
}
/// <summary>
/// Options to specify whether folders should be in the open or closed state.
/// </summary>
public enum FolderType
{
/// <summary>
/// Specify open folder.
/// </summary>
Open = 0,
/// <summary>
/// Specify closed folder.
/// </summary>
Closed = 1
}
/// <summary>
/// Returns an icon for a given file - indicated by the name parameter.
/// </summary>
/// <param name="name">Pathname for file.</param>
/// <param name="size">Large or small</param>
/// <param name="linkOverlay">Whether to include the link icon</param>
/// <returns>System.Drawing.Icon</returns>
public static System.Drawing.Icon GetFileIcon(string name, IconSize size, bool linkOverlay)
{
Shell32.SHFILEINFO shfi = new Shell32.SHFILEINFO();
uint flags = Shell32.SHGFI_ICON | Shell32.SHGFI_USEFILEATTRIBUTES;
if (true == linkOverlay) flags += Shell32.SHGFI_LINKOVERLAY;
/* Check the size specified for return. */
if (IconSize.Small == size)
{
flags += Shell32.SHGFI_SMALLICON ;
}
else
{
flags += Shell32.SHGFI_LARGEICON ;
}
Shell32.SHGetFileInfo( name,
Shell32.FILE_ATTRIBUTE_NORMAL,
ref shfi,
(uint) System.Runtime.InteropServices.Marshal.SizeOf(shfi),
flags );
// Copy (clone) the returned icon to a new object, thus allowing us to clean-up properly
System.Drawing.Icon icon = (System.Drawing.Icon)System.Drawing.Icon.FromHandle(shfi.hIcon).Clone();
User32.DestroyIcon( shfi.hIcon ); // Cleanup
return icon;
}
/// <summary>
/// Used to access system folder icons.
/// </summary>
/// <param name="size">Specify large or small icons.</param>
/// <param name="folderType">Specify open or closed FolderType.</param>
/// <returns>System.Drawing.Icon</returns>
public static System.Drawing.Icon GetFolderIcon( IconSize size, FolderType folderType )
{
// Need to add size check, although errors generated at present!
uint flags = Shell32.SHGFI_ICON | Shell32.SHGFI_USEFILEATTRIBUTES;
if (FolderType.Open == folderType)
{
flags += Shell32.SHGFI_OPENICON;
}
if (IconSize.Small == size)
{
flags += Shell32.SHGFI_SMALLICON;
}
else
{
flags += Shell32.SHGFI_LARGEICON;
}
// Get the folder icon
Shell32.SHFILEINFO shfi = new Shell32.SHFILEINFO();
Shell32.SHGetFileInfo( null,
Shell32.FILE_ATTRIBUTE_DIRECTORY,
ref shfi,
(uint) System.Runtime.InteropServices.Marshal.SizeOf(shfi),
flags );
System.Drawing.Icon.FromHandle(shfi.hIcon); // Load the icon from an HICON handle
// Now clone the icon, so that it can be successfully stored in an ImageList
System.Drawing.Icon icon = (System.Drawing.Icon)System.Drawing.Icon.FromHandle(shfi.hIcon).Clone();
User32.DestroyIcon( shfi.hIcon ); // Cleanup
return icon;
}
}
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2 楼chinchy（糟老头）回复于 2003-03-04 09:15:44 得分 20
/// <summary>
/// Wraps necessary Shell32.dll structures and functions required to retrieve Icon Handles using SHGetFileInfo. Code
/// courtesy of MSDN Cold Rooster Consulting case study.
/// </summary>
///
// This code has been left largely untouched from that in the CRC example. The main changes have been moving
// the icon reading code over to the IconReader type.
public class Shell32
{
public const int MAX_PATH = 256;
[StructLayout(LayoutKind.Sequential)]
public struct SHITEMID
{
public ushort cb;
[MarshalAs(UnmanagedType.LPArray)]
public byte[] abID;
}
[StructLayout(LayoutKind.Sequential)]
public struct ITEMIDLIST
{
public SHITEMID mkid;
}
[StructLayout(LayoutKind.Sequential)]
public struct BROWSEINFO
{
public IntPtr hwndOwner;
public IntPtr pidlRoot;
public IntPtr pszDisplayName;
[MarshalAs(UnmanagedType.LPTStr)]
public string lpszTitle;
public uint ulFlags;
public IntPtr lpfn;
public int lParam;
public IntPtr iImage;
}
// Browsing for directory.
public const uint BIF_RETURNONLYFSDIRS = 0x0001;
public const uint BIF_DONTGOBELOWDOMAIN = 0x0002;
public const uint BIF_STATUSTEXT = 0x0004;
public const uint BIF_RETURNFSANCESTORS = 0x0008;
public const uint BIF_EDITBOX = 0x0010;
public const uint BIF_VALIDATE = 0x0020;
public const uint BIF_NEWDIALOGSTYLE = 0x0040;
public const uint BIF_USENEWUI = (BIF_NEWDIALOGSTYLE | BIF_EDITBOX);
public const uint BIF_BROWSEINCLUDEURLS = 0x0080;
public const uint BIF_BROWSEFORCOMPUTER = 0x1000;
public const uint BIF_BROWSEFORPRINTER = 0x2000;
public const uint BIF_BROWSEINCLUDEFILES = 0x4000;
public const uint BIF_SHAREABLE = 0x8000;
[StructLayout(LayoutKind.Sequential)]
public struct SHFILEINFO
{
public const int NAMESIZE = 80;
public IntPtr hIcon;
public int iIcon;
public uint dwAttributes;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=MAX_PATH)]
public string szDisplayName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=NAMESIZE)]
public string szTypeName;
};
public const uint SHGFI_ICON = 0x000000100; // get icon
public const uint SHGFI_DISPLAYNAME = 0x000000200; // get display name
public const uint SHGFI_TYPENAME = 0x000000400; // get type name
public const uint SHGFI_ATTRIBUTES = 0x000000800; // get attributes
public const uint SHGFI_ICONLOCATION = 0x000001000; // get icon location
public const uint SHGFI_EXETYPE = 0x000002000; // return exe type
public const uint SHGFI_SYSICONINDEX = 0x000004000; // get system icon index
public const uint SHGFI_LINKOVERLAY = 0x000008000; // put a link overlay on icon
public const uint SHGFI_SELECTED = 0x000010000; // show icon in selected state
public const uint SHGFI_ATTR_SPECIFIED = 0x000020000; // get only specified attributes
public const uint SHGFI_LARGEICON = 0x000000000; // get large icon
public const uint SHGFI_SMALLICON = 0x000000001; // get small icon
public const uint SHGFI_OPENICON = 0x000000002; // get open icon
public const uint SHGFI_SHELLICONSIZE = 0x000000004; // get shell size icon
public const uint SHGFI_PIDL = 0x000000008; // pszPath is a pidl
public const uint SHGFI_USEFILEATTRIBUTES = 0x000000010; // use passed dwFileAttribute
public const uint SHGFI_ADDOVERLAYS = 0x000000020; // apply the appropriate overlays
public const uint SHGFI_OVERLAYINDEX = 0x000000040; // Get the index of the overlay
public const uint FILE_ATTRIBUTE_DIRECTORY = 0x00000010;
public const uint FILE_ATTRIBUTE_NORMAL = 0x00000080;
[DllImport("Shell32.dll")]
public static extern IntPtr SHGetFileInfo(
string pszPath,
uint dwFileAttributes,
ref SHFILEINFO psfi,
uint cbFileInfo,
uint uFlags
);
}
/// <summary>
/// Wraps necessary functions imported from User32.dll. Code courtesy of MSDN Cold Rooster Consulting example.
/// </summary>
public class User32
{
/// <summary>
/// Provides access to function required to delete handle. This method is used internally
/// and is not required to be called separately.
/// </summary>
/// <param name="hIcon">Pointer to icon handle.</param>
/// <returns>N/A</returns>
[DllImport("User32.dll")]
public static extern int DestroyIcon( IntPtr hIcon );
}
}
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3 楼chinchy（糟老头）回复于 2003-03-04 09:18:50 得分 10
使用:
//lvFiles是一个listview
DirectoryInfo dirInfo=new DirectoryInfo(sPath);//spath是目录
FileInfo[] fInfo=dirInfo.GetFiles();
string[] sFileItems;
foreach(FileInfo fileinfo in fInfo)
{
sFileItems=new string[]{fileinfo.Name.ToString(),fileinfo.Length.ToString(),getFileType(fileinfo.Extension.ToString()),fileinfo.LastWriteTime.ToString()};
//get icon of file
this.imglSmallIcon.Images.Add(IconReader.GetFileIcon(fileinfo.FullName.ToString(),IconReader.IconSize.Small,false));
this.imglLargeIcon.Images.Add(IconReader.GetFileIcon(fileinfo.FullName.ToString(),IconReader.IconSize.Large,false));
//add item to listview
this.lvFiles.Items.Add(new ListViewItem(sFileItems,this.imglSmallIcon.Images.Count-1));
}Top
4 楼hbuser（soleracker）回复于 2003-03-04 09:27:35 得分 0
listview有一个属性就是对应IMAGELIST集合，一查就知道Top
5 楼yinwu2003（鹦鹉）回复于 2003-03-04 09:29:37 得分 0
同意楼上的Top
6 楼Brunhild（）回复于 2003-03-17 11:43:06 得分 0
markTop
7 楼DannyChen（）回复于 2003-03-17 11:59:14 得分 0
markTop
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