问题描述
我有以下的code这适用于Windows XP和Vista - 32位和64位：
I have the following code which works on Windows XP and Vista - both 32 and 64 bit:
public static 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
var shfi = new Shell32.SHFILEINFO();
Shell32.SHGetFileInfo( null,
Shell32.FILE_ATTRIBUTE_DIRECTORY,
ref shfi,
(uint) Marshal.SizeOf(shfi),
flags );
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
var icon = (Icon)Icon.FromHandle(shfi.hIcon).Clone();
User32Dll.DestroyIcon( shfi.hIcon ); // Cleanup
return icon;
}
的常数的定义如下方式：
The constants are defined the following way:
public const uint SHGFI_ICON = 0x000000100;
public const uint SHGFI_USEFILEATTRIBUTES = 0x000000010;
public const uint SHGFI_OPENICON = 0x000000002;
public const uint SHGFI_SMALLICON = 0x000000001;
public const uint SHGFI_LARGEICON = 0x000000000;
public const uint FILE_ATTRIBUTE_DIRECTORY = 0x00000010;
取的文件夹图标时，这给了在Windows 7中，结果如下：
This gives the following results in windows 7 when fetching the folder icon:
而在Vista中 - 用同样的方法结果在下面的文件夹图标：
While at Vista - using the same method result in the following folder icon:
我想正确的Windows文件夹中的Windows 7图标也 - 不是用来表示在安装Windows的驱动器图标
I would like the "correct" Windows folder icon for Windows 7 also - not the icon used to indicate the drive where Windows is installed.
我不知道在Win32 API和我的非托管编程是旁边没有在Windows平台上。
I don't know the win32 API and my non-managed programming is next to none on the Windows platform.
推荐答案
您不应指定空的请示第一个参数 SHGeFileInfo 。使用的文件夹路径，而不是（请注意，某些文件夹有不同的（非标）图标）。您可以使用临时文件夹或例如应用程序的根目录下。
You shouldn't specify null as yur first parameter to SHGeFileInfo. Use the path to a folder instead (please note that some folders have different (non-standard) icons). You could use the temp folder or your application's root folder for example.
最好的做法是让每个文件夹的正确的图标（换句话说：对 GetFolderIcon 签名更改为公共静态图标GetFolderIcon（串FOLDERPATH，IconSize大小，FolderType folderType）并调用它为你显示每个文件夹）。
Best practise would be to get the correct icon for each folder (in other words: Change the signature of GetFolderIcon to public static Icon GetFolderIcon(string folderPath, IconSize size, FolderType folderType) and call it for each folder you display).
似乎有其已经具备了获取的文件夹图标的托管包装的开源库。在PInvoke.net（为的SHGetFileInfo项）已找到：
There seems to be an open source library which already has a managed wrapper for fetching folder icons.Found on PInvoke.net (the entry for SHGetFileInfo):
然而，这并不重要，如果你想要一个磁盘或文件夹的图标的工作。
在这种情况下，你可以使用由ManagedWindowsApi项目所提供的ExtendedFileInfo类（ http://mwinapi.sourceforge.net ）。
In that case, you can use the ExtendedFileInfo class provided by the ManagedWindowsApi project (http://mwinapi.sourceforge.net).
如果你想坚持一个手工制作的解决方案，这对我的作品（Win7的X64 RTM，.NET 3.5 SP1）：
If you want to stick to a hand-crafted solution, this works for me (Win7 x64 RTM, .NET 3.5 SP1):
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace IconExtractor
{
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct SHFILEINFO
{
public IntPtr hIcon;
public int iIcon;
public uint dwAttributes;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string szDisplayName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
public string szTypeName;
};
public enum FolderType
{
Closed,
Open
}
public enum IconSize
{
Large,
Small
}
public partial class Form1 : Form
{
[DllImport("shell32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, out SHFILEINFO psfi, uint cbFileInfo, uint uFlags);
[DllImport("user32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool DestroyIcon(IntPtr hIcon);
public const uint SHGFI_ICON = 0x000000100;
public const uint SHGFI_USEFILEATTRIBUTES = 0x000000010;
public const uint SHGFI_OPENICON = 0x000000002;
public const uint SHGFI_SMALLICON = 0x000000001;
public const uint SHGFI_LARGEICON = 0x000000000;
public const uint FILE_ATTRIBUTE_DIRECTORY = 0x00000010;
public static Icon GetFolderIcon(IconSize size, FolderType folderType)
{
// Need to add size check, although errors generated at present!
uint flags = SHGFI_ICON | SHGFI_USEFILEATTRIBUTES;
if (FolderType.Open == folderType)
{
flags += SHGFI_OPENICON;
}
if (IconSize.Small == size)
{ flags += SHGFI_SMALLICON;
}
else
{
flags += SHGFI_LARGEICON;
}
// Get the folder icon
var shfi = new SHFILEINFO();
var res = SHGetFileInfo(@"C:\Windows",
FILE_ATTRIBUTE_DIRECTORY,
out shfi,
(uint) Marshal.SizeOf(shfi),
flags );
if (res == IntPtr.Zero)
throw Marshal.GetExceptionForHR(Marshal.GetHRForLastWin32Error());
// Load the icon from an HICON handle
Icon.FromHandle(shfi.hIcon);
// Now clone the icon, so that it can be successfully stored in an ImageList
var icon = (Icon)Icon.FromHandle(shfi.hIcon).Clone();
DestroyIcon( shfi.hIcon ); // Cleanup
return icon;}
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
try
{
Icon icon = GetFolderIcon(IconSize.Large, FolderType.Open);
pictureBox1.Image = icon.ToBitmap();
// Note: The image actually should be disposed somewhere
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}
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