C#怎么获取文件默认图标 - 黑马程序员技术交流社区

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Drawing;
namespace test8
{
class FileIcon
{
[StructLayout(LayoutKind.Sequential)]
public struct SHFILEINFO
{
public IntPtr hIcon;
public IntPtr iIcon;
public uint dwAttributes;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
public string szDisplayName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
public string szTypeName;
}
public enum SHGFI
{
SHGFI_ICON = 0x100,
SHGFI_LARGEICON = 0x0,
SHGFI_USEFILEATTRIBUTES = 0x10
}
[DllImport("shell32.dll")]
public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);
/// <summary>
/// 获取文件图标
/// </summary>
/// <param name="p_Path">文件路径</param>
/// <returns></returns>
public Icon GetFileIcon(string p_Path)
{
SHFILEINFO _SHFILEINFO = new SHFILEINFO();
IntPtr _IconIntPtr = SHGetFileInfo(p_Path, 0, ref _SHFILEINFO, (uint)Marshal.SizeOf(_SHFILEINFO), (uint)(SHGFI.SHGFI_ICON | SHGFI.SHGFI_LARGEICON | SHGFI.SHGFI_USEFILEATTRIBUTES));
if (_IconIntPtr.Equals(IntPtr.Zero)) return null;
Icon _Icon = System.Drawing.Icon.FromHandle(_SHFILEINFO.hIcon);
return _Icon;
}
/// <summary>
/// 获取文件夹图标
/// </summary>
/// <returns></returns>
public Icon GetDirectoryIcon()
{
SHFILEINFO _SHFILEINFO = new SHFILEINFO();
IntPtr _IconIntPtr = SHGetFileInfo(@"", 0, ref _SHFILEINFO, (uint)Marshal.SizeOf(_SHFILEINFO), (uint)(SHGFI.SHGFI_ICON | SHGFI.SHGFI_LARGEICON));
if (_IconIntPtr.Equals(IntPtr.Zero)) return null;
Icon _Icon = System.Drawing.Icon.FromHandle(_SHFILEINFO.hIcon);
return _Icon;
}
}
}

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