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Public Declare Function ShowScrollBar Lib "user32" (ByVal hwnd As Long, ByVal wBar As Long, ByVal bShow As Long) As Long
Public Const SB_HORZ = 0        'ˮƽ
Public Const SB_VERT = 1         '´¹Ö±
Public Const SB_BOTH = 3        'Á½Õß¶¼ÓÐ
ÔÚChangeʼþÖÐ,µ÷ÓþͿÉÒÔÁË:
Private bShow As Boolean        'ÊÇ·ñÒѾ­¸Ä±äScrollbarsÊôÐÔ,ÄãÒ²¿ÉÒÔÊ¡ÂÔÕâ¸ö¿ØÖÆ
Private Sub txtText_Change()
    txtText.SelStart = Len(txtText.Text)
    If bShow = True Then Exit Sub    '¶Áȡһ¸ö±äÁ¿µÄËÙ¶ÈÒª±È¶Áȡһ¸öÊôÐÔ¿ì,¿´ÏÂC++
       If TextHeight(txtText.Text) > txtText.Height Then
          ShowScrollBar txtText.hwnd, SB_VERT, True
          bShow = True                        'Ï´β»ÓÃÔÙÅжÏ
       End If
       
End Sub


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