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SHGetFileInfo 함수를 사용 하는 방법

using System.Runtime.InteropServices;

[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;
};

class Win32
{
	public const uint SHGFI_ICON = 0x100;
	public const uint SHGFI_LARGEICON = 0x0; // 'Large icon
	public const uint SHGFI_SMALLICON = 0x1; // 'Small icon
		
	[DllImport("shell32.dll")]
	public static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);
}

private int nIndex = 0;

IntPtr hImgSmall; //the handle to the system image list
IntPtr hImgLarge; //the handle to the system image list
string fName; //  'the file name to get icon from
SHFILEINFO shinfo = new SHFILEINFO();
   
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.InitialDirectory = "c:\\temp\\";
openFileDialog1.Filter = "All files (*.*)|*.*";
openFileDialog1.FilterIndex = 2;
openFileDialog1.RestoreDirectory = true ;

listView1.SmallImageList = imageList1;
listView1.LargeImageList = imageList1;
			
if(openFileDialog1.ShowDialog() == DialogResult.OK) 
{
     fName = openFileDialog1.FileName;
     //Use this to get the small Icon
     hImgSmall = Win32.SHGetFileInfo(fName, 0, ref shinfo,(uint)Marshal.SizeOf(shinfo),Win32.SHGFI_ICON |Win32.SHGFI_SMALLICON);

    //Use this to get the large Icon
    //hImgLarge = SHGetFileInfo(fName, 0, 
    //	ref shinfo, (uint)Marshal.SizeOf(shinfo), 
    //	Win32.SHGFI_ICON | Win32.SHGFI_LARGEICON);

    //The icon is returned in the hIcon member of the shinfo struct
    System.Drawing.Icon myIcon = System.Drawing.Icon.FromHandle(shinfo.hIcon);
				
    imageList1.Images.Add(myIcon);
				
    //Add file name and icon to listview
    listView1.Items.Add(fName, nIndex++); 
}

출처 : http://support.microsoft.com/kb/319350/ko

FileIcon_Src.zip

OSIcon_src_v2.0.zip