【转】禁止vb文本框粘贴输入负数以及输入多个小数点

本文转自：http://hi.baidu.com/ych0518/blog/item/b3b06559c429c5282834f0c5.html

Dim pd As Boolean

Private Sub Text1_KeyPress(KeyAscii As Integer)
If (KeyAscii < 48 Or KeyAscii > 57) And KeyAscii <> 46 And KeyAscii <> 8 Then
KeyAscii = 0
End If
If pd = True And KeyAscii = 46 Then
KeyAscii = 0
End If
If pd = False And KeyAscii = 46 Then
pd = True
KeyAscii = 46
End If
End Sub

Private Sub Text1_KeyDown(KeyCode As Integer, Shift As Integer)
         '防止Ctrl + V 粘贴
     If KeyCode = vbKeyV And Shift = vbCtrlMask Then
         Text1.Enabled = False
         Clipboard.Clear
         Text1.Enabled = True
     End If
     '防止Shift Insert粘贴
If KeyCode = 45 And Shift = vbShiftMask Then
Text1.Enabled = False
Clipboard.Clear
Text1.Enabled = True
End If
End Sub

Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
    If Button = vbRightButton Then
       Text1.Enabled = False
       Clipboard.Clear
       Text1.Enabled = True
    End If
End Sub