VB.NET获取文件默认图标的方法

 Private Structure SHFILEINFO Public hIcon As IntPtr Public iIcon As Integer Public dwAttributes As Integer  _ Public szDisplayName As String  _ Public szTypeName As String End Structure Private Declare Auto Function SHGetFileInfo Lib "shell32.dll" _ (ByVal pszPath As String, _ ByVal dwFileAttributes As Integer, _ ByRef psfi As SHFILEINFO, _ ByVal cbFileInfo As Integer, _ ByVal uFlags As Integer) As IntPtr Private Const SHGFI_ICON = &H100 Private Const SHGFI_SMALLICON = &H1 Private Const SHGFI_LARGEICON = &H0 Private nIndex = 0 Private hImgLarge As IntPtr 'The handle to the system image list. Private Function GetLargeIcon(ByVal FilePath As String) As System.Drawing.Icon Dim fName As String Dim shinfo As SHFILEINFO shinfo = New SHFILEINFO() shinfo.szDisplayName = New String(Chr(0), 260) shinfo.szTypeName = New String(Chr(0), 80) fName = FilePath hImgLarge = SHGetFileInfo(fName, 0, shinfo, Marshal.SizeOf(shinfo), SHGFI_ICON Or SHGFI_LARGEICON) Dim myIcon As System.Drawing.Icon myIcon = System.Drawing.Icon.FromHandle(shinfo.hIcon) Return myIcon End Function Private Function GetSmallIcon(ByVal FilePath As String) As System.Drawing.Icon Dim fName As String Dim shinfo As SHFILEINFO shinfo = New SHFILEINFO() shinfo.szDisplayName = New String(Chr(0), 260) shinfo.szTypeName = New String(Chr(0), 80) fName = FilePath hImgLarge = SHGetFileInfo(fName, 0, shinfo, Marshal.SizeOf(shinfo), SHGFI_ICON Or SHGFI_SMALLICON) Dim myIcon As System.Drawing.Icon myIcon = System.Drawing.Icon.FromHandle(shinfo.hIcon) Return myIcon End Function