VB6位运算

'位左移
Public Function SHL(nSource As Long, n As Byte) As Long
    SHL = nSource * 2 ^ n
End Function

'位右移
Public Function SHR(nSource As Long, n As Byte) As Long
    SHR = nSource / 2 ^ n
End Function

'获得指定的位
Public Function GetBits(nSource As Long, n As Byte) As Boolean
    GetBits = nSource And 2 ^ n
End Function

'设置指定的位
Public Function SetBits(nSource As Long, n As Byte) As Long
    SetBits = nSource Or 2 ^ n
End Function

'清除指定的位
Public Function ResetBits(nSource As Long, n As Byte) As Long
    ResetBits = nSource And Not 2 ^ n
End Function