pointflag是VB里的关键字或者函数吗？

不是，自己定义的，下面是所有的保留字

AddHandler AddressOf And
AndAlso Ansi Alias
As Assembly Auto
Boolean ByRef Byte
ByVal Call Case
Catch CByte CBool
CChar CDate Cdec
CDbl Char CInt
CStr CType Date
Decimal Declre Default
Delegante Dim DirectCast
Do Double Each
Else Elseif End
Enum Erase Error
Event Exit False
Finally For Friend
Function Get GetType
GoTo Handles If
Implements Imports In
Inherits Integer Interface
Is Let Lib
Like Long Loop
Me Mod Module
MustInherit MustOverride MyBase
MyClass Namespace New
Next Not Nothing
NotInheritable NotOverridble Object
On Option Optional
Or OrElse Overloads
Overridable Overrides ParamArray
Preserve Private Property
Protected Public RaiseEvent
ReadOnly ReDim REM
RemoverHandleer Resume Return
Select Set Shadows
S