在C#中要獲取各種文件的圖標，可以通過API調用來完成。主要的函數是SHGetFileInfo.在C#中操作的方式如下 :
第一步：准備SHGetFileInfo需要的各種參數類型。
1.FileInfoStruct
[StructLayout( LayoutKind.Sequential)]
public struct FileInfoStruct
...{
public IntPtr hIcon;
public int iIcon;
public int dwAttributes;
[ MarshalAs( UnmanagedType.ByValTStr, SizeConst = 260 )]
public string szDisplayName;
[ MarshalAs( UnmanagedType.ByValTStr, SizeConst = 80 )]
public string szTypeName;
}
2.FileInfoFlags
public enum FileInfoFlags : int
...{
SHGFI_ICON = 0x000000100 , // get icon
SHGFI_DISPLAYNAME = 0x000000200 , // get display name
SHGFI_TYPENAME = 0x000000400 , // get type name
SHGFI_ATTRIBUTES = 0x000000800 , // get attributes
SHGFI_ICONLOCATION = 0x000001000 , // get icon location
SHGFI_EXETYPE = 0x000002000 , // return exe type
SHGFI_SYSICONINDEX = 0x000004000 , // get system icon index
SHGFI_LINKOVERLAY = 0x000008000 , // put a link overlay on icon [Page]
SHGFI_SELECTED = 0x000010000 , // show icon in selected state
SHGFI_ATTR_SPECIFIED = 0x000020000 , // get only specifIEd attributes
SHGFI_LARGEICON = 0x000000000 , // get large icon
SHGFI_SMALLICON = 0x000000001 , // get small icon
SHGFI_OPENICON = 0x000000002 , // get open icon
SHGFI_SHELLICONSIZE = 0x000000004 , // get shell size icon
SHGFI_PIDL = 0x000000008 , // pszPath is a pidl
SHGFI_USEFILEATTRIBUTES = 0x000000010 , // use passed dwFileAttribute
SHGFI_ADDOVERLAYS = 0x000000020 , // apply the appropriate overlays
SHGFI_OVERLAYINDEX = 0x000000040 // Get the index of the overlay
}
3.FileAttributeFlags(這個.Net中好像已經有了)
public enum FileAttributeFlags : int
...{
FILE_ATTRIBUTE_READONLY = 0x00000001 ,
FILE_ATTRIBUTE_HIDDEN = 0x00000002 ,
FILE_ATTRIBUTE_SYSTEM = 0x00000004 ,
FILE_ATTRIBUTE_DIRECTORY = 0x00000010 ,
FILE_ATTRIBUTE_ARCHIVE = 0x00000020 ,
FILE_ATTRIBUTE_DEVICE = 0x00000040 , [Page]
FILE_ATTRIBUTE_NORMAL = 0x00000080 ,
FILE_ATTRIBUTE_TEMPORARY = 0x00000100 ,
FILE_ATTRIBUTE_SPARSE_FILE = 0x00000200 ,
FILE_ATTRIBUTE_REPARSE_POINT = 0x00000400 ,
FILE_ATTRIBUTE_COMPRESSED = 0x00000800 ,
FILE_ATTRIBUTE_OFFLINE = 0x00001000 ,
FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 0x00002000 ,
FILE_ATTRIBUTE_ENCRYPTED = 0x00004000
}
然後 開始准備調用SHELL API了 :
[DllImport(\"shell32.dll \" , EntryPoint =\"SHGetFileInfo\")]
public static extern int GetFileInfo( string pszPath, int dwFileAttributes,
ref FileInfoStruct psfi, int cbFileInfo, int uFlags);
好了現在一切都准備好了 我們現在通過下面的兩個方法來獲取圖標
public static Icon GetLargeIcon(string pFilePath)
...{
FileInfoStruct _info = new FileInfoStruct();
Win32API.GetFileInfo(pFilePath, 0 , ref _info, Marshal.SizeOf(_info),
( int )(FileInfoFlags.SHGFI_ICON | FileInfoFlags.SHGFI_LARGEICON));
try
...{
return Icon.FromHandle(_info.hIcon);
} [Page]
catch
...{
return null ;
}
}
public static Icon GetSmallIcon(string pFilePath)
...{
FileInfoStruct _info = new FileInfoStruct();
Win32API.GetFileInfo(pFilePath, 0 , ref _info, Marshal.SizeOf(_info),
( int )(FileInfoFlags.SHGFI_ICON | FileInfoFlags.SHGFI_SMALLICON));
try
...{
return Icon.FromHandle(_info.hIcon);
}
catch
...{
return null ;
}
}
呵呵 工作就做完了。但是我發現這樣取出來的Icon在TreeVIEw 中顯示的時候特別難看。但是目前也沒有什麼好方法。畢竟圖標太多了。
