自己是否想过重画控件，现在用强大的VB来实现吧。
下例就是简单的利用VB中的CommandButton改变成Flat3DButton风格。其实就是利用VB的SubClass去处理父窗口的WM_DRAWITEM消息。
1. 建立一个标准EXE工程，加入Command1和Command2，将Command1的Style属性设为Graphical。
2. 加入模块，取名SubClass_Flat3DButton，贴进代码：
Option Explicit
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'Copyright 2002 40Star, All Rights Reserved.
'
'E-Mail ：[email protected]
'Distribution：你可以完全自由随便的使用这段代码，不管你用于任何目的
' 程序在于交流和学习
' 如有任何BUG请和我联系
'
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Private Declare Function GetParent Lib "user32" _
(ByVal hWnd As Long) As Long
Private Declare Function GetWindowLong Lib "user32" Alias _
"GetWindowLongA" (ByVal hWnd As Long, _
ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias _
"SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex _
As Long, ByVal dwNewLong As Long) As Long
Private Declare Function CallWindowProc Lib "user32" Alias _
"CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal _
hWnd As Long, ByVal Msg As Long, ByVal wParam As _
Long, ByVal lParam As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
(Destination As Any, Source As Any, ByVal Length As Long)
Const GWL_WNDPROC = (-4&)
Dim PrevWndProc&
Private Const WM_DESTROY = &H2
Private Const WM_DRAWITEM = &H2B
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Type DRAWITEMSTRUCT
CtlType As Long
CtlID As Long
itemID As Long
itemAction As Long
itemState As Long
hwndItem As Long
hdc As Long
rcItem As RECT
itemData As Long
End Type
' Owner draw constants
Private Const ODT_BUTTON = 4
' Owner draw actions
Private Const ODA_DRAWENTIRE = &H1
Private Const ODA_SELECT = &H2
Private Const ODA_FOCUS = &H4
' Owner draw state
Private Const ODS_SELECTED = &H1
Private Const ODS_GRAYED = &H2
Private Const ODS_DISABLED = &H4
Private Const ODS_CHECKED = &H8
Private Const ODS_FOCUS = &H10
Private Declare Function GetWindowText Lib "user32" Alias _
"GetWindowTextA" (ByVal hWnd As Long, ByVal lpString As String, _
ByVal cch As Long) As Long
'Various GDI painting-related functions
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function CreateSolidBrush Lib "gdi32" (ByVal crColor As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Declare Function GetSysColor Lib "user32" (ByVal nIndex As Long) As Long
' Color Types
Const CTLCOLOR_MSGBOX = 0
Const CTLCOLOR_EDIT = 1
Const CTLCOLOR_LISTBOX = 2
Const CTLCOLOR_BTN = 3
Const CTLCOLOR_DLG = 4
Const CTLCOLOR_SCROLLBAR = 5
Const CTLCOLOR_STATIC = 6
Const CTLCOLOR_MAX = 8 ' three bits max
Const COLOR_SCROLLBAR = 0
Const COLOR_BACKGROUND = 1
Const COLOR_ACTIVECAPTION = 2
Const COLOR_INACTIVECAPTION = 3
Const COLOR_MENU = 4
Const COLOR_WINDOW = 5
Const COLOR_WINDOWFRAME = 6
Const COLOR_MENUTEXT = 7
Const COLOR_WINDOWTEXT = 8
Const COLOR_CAPTIONTEXT = 9
Const COLOR_ACTIVEBORDER = 10
Const COLOR_INACTIVEBORDER = 11
Const COLOR_APPWORKSPACE = 12
Const COLOR_HIGHLIGHT = 13
Const COLOR_HIGHLIGHTTEXT = 14
Const COLOR_BTNFACE = 15
Const COLOR_BTNSHADOW = 16
Const COLOR_GRAYTEXT = 17
Const COLOR_BTNTEXT = 18
Const COLOR_INACTIVECAPTIONTEXT = 19
Const COLOR_BTNHIGHLIGHT = 20
Private Declare Function FillRect Lib "user32" (ByVal hdc As Long, lpRect As RECT, ByVal hBrush As Long) As Long
Private Declare Function FrameRect Lib "user32" (ByVal hdc As Long, lpRect As RECT, ByVal hBrush As Long) As Long
Private Declare Function RoundRect Lib "gdi32" (ByVal hdc As Long, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long, ByVal X3 As Long, ByVal Y3 As Long) As Long
'pen Api
Private Declare Function CreatePen Lib "gdi32" (ByVal nPenStyle As Long, ByVal nWidth As Long, ByVal crColor As Long) As Long
' Pen Styles
Const PS_SOLID = 0
Const PS_DASH = 1 ' -------
Const PS_DOT = 2 ' .......
Const PS_DASHDOT = 3 ' _._._._
Const PS_DASHDOTDOT = 4 ' _.._.._
Const PS_NULL = 5
Const PS_INSIDEFRAME = 6
Const PS_USERSTYLE = 7
Const PS_ALTERNATE = 8
Const PS_STYLE_MASK = &HF
Private Declare Function MoveToEx Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, lpPoint As POINTAPI) As Long
Private Declare Function LineTo Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long) As Long
Private Type POINTAPI
x As Long
y As Long
End Type
Private Declare Function DrawText Lib "user32" Alias "DrawTextA" _
(ByVal hdc As Long, ByVal lpStr As String, ByVal nCount As Long, _
lpRect As RECT, ByVal wFormat As Long) As Long
Private Const DT_SINGLELINE = &H20
Private Const DT_CENTER = &H1
Private Const DT_VCENTER = &H4
Private Declare Function SetTextColor Lib "gdi32" (ByVal hdc As Long, _
ByVal crColor As Long) As Long
Private Declare Function SetBkMode Lib "gdi32" (ByVal hdc As Long, _
ByVal nBkMode As Long) As Long
Private Const TRANSPARENT = 1
Private Sub DrawButton(ByVal hWnd As Long, ByVal hdc As Long, _
rct As RECT, ByVal nState As Long)
Dim P As POINTAPI
Dim s As String
Dim hbr As Long
Dim hpen As Long
hbr = CreateSolidBrush(GetSysColor(COLOR_BTNFACE))
SelectObject hdc, hbr
FillRect hdc, rct, hbr
DeleteObject hbr
'画文字时背景为透明状
SetBkMode hdc, TRANSPARENT
'得到Button的Caption
s = String$(255, 0)
GetWindowText hWnd, s, 255
s = Left$(s, InStr(s, Chr$(0)) - 1)
'根据Button的Enabled状态进行重画
If (nState And ODS_DISABLED) = ODS_DISABLED Then
'画内侧3D效果->亮色
hpen = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_BTNHIGHLIGHT))
SelectObject hdc, hpen
MoveToEx hdc, rct.Left, rct.Top, P
LineTo hdc, rct.Right, rct.Top
MoveToEx hdc, rct.Left, rct.Top, P
LineTo hdc, rct.Left, rct.Bottom
DeleteObject hpen
'画内侧3D效果->暗色
hpen = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_BTNSHADOW))
SelectObject hdc, hpen
MoveToEx hdc, rct.Left, rct.Bottom - 1, P
LineTo hdc, rct.Right, rct.Bottom - 1
MoveToEx hdc, rct.Right - 1, rct.Top, P
LineTo hdc, rct.Right - 1, rct.Bottom
DeleteObject hpen
'画阴影文字
rct.Left = rct.Left + 1
rct.Right = rct.Right + 1
rct.Bottom = rct.Bottom + 1
rct.Top = rct.Top + 1
SetTextColor hdc, GetSysColor(COLOR_BTNHIGHLIGHT)
DrawText hdc, s, Len(s), rct, DT_CENTER Or DT_SINGLELINE Or DT_VCENTER
rct.Left = rct.Left - 1
rct.Right = rct.Right - 1
rct.Bottom = rct.Bottom - 1
rct.Top = rct.Top - 1
SetTextColor hdc, GetSysColor(COLOR_GRAYTEXT)
DrawText hdc, s, Len(s), rct, DT_CENTER Or DT_SINGLELINE Or DT_VCENTER
Exit Sub
End If
'按下Button时重画
If (nState And ODS_SELECTED) = ODS_SELECTED Then
'画外围黑框
hbr = CreateSolidBrush(GetSysColor(COLOR_BTNTEXT))
SelectObject hdc, hbr
FrameRect hdc, rct, hbr
DeleteObject hbr
hbr = CreateSolidBrush(GetSysColor(COLOR_BTNSHADOW))
SelectObject hdc, hbr
rct.Left = rct.Left + 1
rct.Right = rct.Right - 1
rct.Bottom = rct.Bottom - 1
rct.Top = rct.Top + 1
FrameRect hdc, rct, hbr
DeleteObject hbr
rct.Left = rct.Left + 1
rct.Right = rct.Right + 1
rct.Bottom = rct.Bottom + 1
rct.Top = rct.Top + 1
SetTextColor hdc, GetSysColor(COLOR_BTNTEXT)
DrawText hdc, s, Len(s), rct, DT_CENTER Or DT_SINGLELINE Or DT_VCENTER
Exit Sub
End If
'Button得到焦点时重画
If (nState And ODS_FOCUS) = ODS_FOCUS Then
'画外围黑框
hbr = CreateSolidBrush(GetSysColor(COLOR_BTNTEXT))
SelectObject hdc, hbr
FrameRect hdc, rct, hbr
DeleteObject hbr
'画内侧3D效果->亮色
hpen = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_BTNHIGHLIGHT))
SelectObject hdc, hpen
MoveToEx hdc, rct.Left + 1, rct.Top + 1, P
LineTo hdc, rct.Right - 1, rct.Top + 1
MoveToEx hdc, rct.Left + 1, rct.Top + 1, P
LineTo hdc, rct.Left + 1, rct.Bottom - 1
DeleteObject hpen
'画内侧3D效果->暗色
hpen = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_BTNSHADOW))
SelectObject hdc, hpen
MoveToEx hdc, rct.Left + 1, rct.Bottom - 2, P
LineTo hdc, rct.Right - 1, rct.Bottom - 2
MoveToEx hdc, rct.Right - 2, rct.Top + 1, P
LineTo hdc, rct.Right - 2, rct.Bottom - 1
DeleteObject hpen
SetTextColor hdc, GetSysColor(COLOR_BTNTEXT)
DrawText hdc, s, Len(s), rct, DT_CENTER Or DT_SINGLELINE Or DT_VCENTER
Else
'画内侧3D效果->亮色
hpen = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_BTNHIGHLIGHT))
SelectObject hdc, hpen
MoveToEx hdc, rct.Left, rct.Top, P
LineTo hdc, rct.Right, rct.Top
MoveToEx hdc, rct.Left, rct.Top, P
LineTo hdc, rct.Left, rct.Bottom
DeleteObject hpen
'画内侧3D效果->暗色
hpen = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_BTNSHADOW))
SelectObject hdc, hpen
MoveToEx hdc, rct.Left, rct.Bottom - 1, P
LineTo hdc, rct.Right, rct.Bottom - 1
MoveToEx hdc, rct.Right - 1, rct.Top, P
LineTo hdc, rct.Right - 1, rct.Bottom
DeleteObject hpen
'画阴影文字
SetTextColor hdc, GetSysColor(COLOR_BTNTEXT)
DrawText hdc, s, Len(s), rct, DT_CENTER Or DT_SINGLELINE Or DT_VCENTER
End If
End Sub
Private Function SubWndProc(ByVal hWnd As Long, ByVal Msg As Long, _
ByVal wParam As Long, ByVal lParam As Long) _
As Long
Dim di As DRAWITEMSTRUCT
If Msg = WM_DESTROY Then Terminate (hWnd)
'处理自画消息
If Msg = WM_DRAWITEM Then
CopyMemory di, ByVal lParam, Len(di)
'判断是自画Button
If di.CtlType = ODT_BUTTON Then
DrawButton di.hwndItem, di.hdc, di.rcItem, di.itemState
'不返回VB的默认Button绘制过程
SubWndProc = 1
Exit Function
End If
End If
SubWndProc = CallWindowProc(PrevWndProc, hWnd, Msg, wParam, lParam)
End Function
Public Sub Init(hWnd As Long)
PrevWndProc = SetWindowLong(hWnd, GWL_WNDPROC, AddressOf SubWndProc)
End Sub
Public Sub Terminate(hWnd As Long)
Call SetWindowLong(hWnd, GWL_WNDPROC, PrevWndProc)
End Sub
' -- 模块结束 -- '
3. Form1中的代码：
Option Explicit
Private Sub Form_Load()
Call Init(Me.hWnd)
End Sub
Private Sub Form_Unload(Cancel As Integer)
Call Terminate(Me.hWnd)
End Sub
4. 结束语
怎么样，看到两个Button之间的不同了么
本程序在Win2000 + Vb6中调试通过。 
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