VB使用CopyMemory字符串处理

不能直接使用CopyMemoryStr，应该将字符串转为byte数组，然后使用CopyMemory

Property Get item() As String
If h = 0 Then ErrRaise ERROR_INVALID_DATA
'BugAssert p <> pNull
Dim c As Long, ptr0 As Long
Dim ab() As Byte
'取出BSTR的长度
CopyMemory c, ByVal p, 4
If c > 0 Then
ReDim ab(c - 1)
CopyMemory ByVal VarPtr(ab(0)), ByVal (p + 4), c
item = ab
End If
End Property

Property Let item(s As String)
If h = 0 Then ErrRaise ERROR_INVALID_DATA
'BugAssert p <> pNull
Dim c As Long
Dim ab() As Byte
c = LenB(s)
ab = s
' 重新将BSTR放回内存中
CopyMemory ByVal p, c, 4
CopyMemory ByVal (p + 4), ByVal VarPtr(ab(0)), c
End Property