C#中呼叫API獲得指定檔案的圖示

最近在寫一個媒體管理的伺服器程式。裡面要用到了一個獲得指定檔案的整合圖示的。所以就寫了一個用C#中呼叫API來獲得指定檔案的圖示的程式碼,程式碼如下：

匯入API的類:

using System;
using System.Runtime.InteropServices;

namespace MediaClient
...{
    public class Win32
    ...{
        [DllImport("shell32.dll", EntryPoint = "ExtractIcon")]
        public static extern int ExtractIcon(IntPtr hInst,string lpFileName,int nIndex);

[DllImport("shell32.dll", EntryPoint = "SHGetFileInfo")]
public static extern IntPtr SHGetFileInfo(string pszPath,uint dwFileAttribute,ref SHFILEINFO psfi,uint cbSizeFileInfo,uint Flags);

[DllImport("User32.dll", EntryPoint = "DestroyIcon")]
public static extern int DestroyIcon(IntPtr hIcon);

        [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;
        };
    }
}

呼叫方法：

/**////

/// 獲得指定路徑下面的所有檔案及資料夾
///

        /// 路徑
        ///
        public ArrayList GetListViewItem(string path,ImageList imglist)
        ...{
            Win32.SHFILEINFO shfi = new Win32.SHFILEINFO();
            try
            ...{
                string[] dirs = Directory.GetDirectories(path);
                string[] files = Directory.GetFiles(path);
                ArrayList itemarr = new ArrayList();

                for (int i = 0; i < dirs.Length; i++)
                ...{
                    string[] info = new string[4];
                    DirectoryInfo dir = new DirectoryInfo(dirs[i]);
                    //獲得圖示
                    Win32.SHGetFileInfo(dirs[i],
                                        (uint)0x80,
                                        ref shfi,
                                        (uint)System.Runtime.InteropServices.Marshal.SizeOf(shfi),
                                        (uint)(0x100 | 0x400)); //取得Icon和TypeName
                    //新增圖示
                    imglist.Images.Add(dir.Name, (Icon)Icon.FromHandle(shfi.hIcon).Clone());
                    info[0] = dir.Name;
                    info[1] = "";
                    info[2] = "資料夾";
                    info[3] = dir.LastWriteTime.ToString();
                    ListViewItem item = new ListViewItem(info,dir.Name);
                    itemarr.Add(item);
                    //銷燬圖示
                    Win32.DestroyIcon(shfi.hIcon);
                }
                for (int i = 0; i < files.Length; i++)
                ...{
                    string[] info = new string[4];
                    FileInfo fi = new FileInfo(files[i]);
                    //獲得圖示
                    Win32.SHGetFileInfo(files[i],
                                        (uint)0x80,
                                        ref shfi,
                                        (uint)System.Runtime.InteropServices.Marshal.SizeOf(shfi),
                                        (uint)(0x100 | 0x400)); //取得Icon和TypeName
                    //新增圖示
                    imglist.Images.Add(fi.Name,(Icon)Icon.FromHandle(shfi.hIcon).Clone());
                    info[0] = fi.Name;
                    info[1] = fi.Length.ToString();
                    info[2] = fi.Extension.ToString();
                    info[3] = fi.LastWriteTime.ToString();
                    ListViewItem item = new ListViewItem(info,fi.Name);
                    itemarr.Add(item);
                    //銷燬圖示
                    Win32.DestroyIcon(shfi.hIcon);
                }
                return itemarr;

            }
            catch
            ...{
                return null;
            }
        }

uFlags常數：
SHGFI_ICON                                   =   0x100
SHGFI_DISPLAYNAME                   =   0x200,
SHGFI_TYPENAME                        =   0x400,
SHGFI_ATTRIBUTES                     =   0x800,
SHGFI_ICONLOCATION                 =   0x1000,
SHGFI_EXETYPE                           =   0x2000,
SHGFI_SYSICONINDEX                 =   0x4000,
SHGFI_LINKOVERLAY                  =   0x8000,
SHGFI_SELECTED                        =   0x10000,
SHGFI_ATTR_SPECIFIED             =   0x20000,
SHGFI_LARGEICON                      =   0x0,
SHGFI_SMALLICON                     =   0x1,
SHGFI_OPENICON                        =   0x2,
SHGFI_SHELLICONSIZE              =   0x4,
SHGFI_PIDL                                 =   0x8,
SHGFI_USEFILEATTRIBUTES      =   0x10

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/14766526/viewspace-562964/，如需轉載，請註明出處，否則將追究法律責任。

C#中呼叫API獲得指定檔案的圖示

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