API函数SetWindowPos
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'这个函数能为窗口指定一个新位置和状态。它也可改变窗口在内部窗口列表中的位置。该函数与DeferWindowPos函数相似，只是它的作用是立即表现出来的（在vb里使用：针对vb窗体，如它们在win32下屏蔽或最小化，则需重设最顶部状态。如有必要，请用一个子类处理模块来重设最顶部状态）
Public
Declare
Function
SetWindowPos
Lib
"user32"
_
(ByVal
hwnd
As
Long,
_
ByVal
hWndInsertAfter
As
Long,
_
ByVal
x
As
Long,
_
ByVal
y
As
Long,
_
ByVal
cx
As
Long,
_
ByVal
cy
As
Long,
_
ByVal
wFlags
As
Long)
As
Long
'hwnd
-----------
Long，欲定位的窗口
'hWndInsertAfter
-
Long，窗口句柄。在窗口列表中，窗口hwnd会置于这个窗口句柄的后面。也可能选用下述值之一：
Public
Const
HWND_BOTTOM
=
1
'将窗口置于窗口列表底部
Public
Const
HWND_TOP
=
'将窗口置于Z序列的顶部；Z序列代表在分级结构中，窗口针对一个给定级别的窗口显示的顺序
Public
Const
HWND_TOPMOST
=
-1
'将窗口置于列表顶部，并位于任何最顶部窗口的前面
Public
Const
HWND_NOTOPMOST
=
-2
'将窗口置于列表顶部，并位于任何最顶部窗口的后面
'x
--------------
Long，窗口新的x坐标。如hwnd是一个子窗口，则x用父窗口的客户区坐标表示
'y
--------------
Long，窗口新的y坐标。如hwnd是一个子窗口，则y用父窗口的客户区坐标表示
'cx
-------------
Long，指定新的窗口宽度
'cy
-------------
Long，指定新的窗口高度
'wFlags
---------
Long，包含了旗标的一个整数
Public
Const
SWP_FRAMECHANGED
=
H20
'强迫一条WM_NCCALCSIZE消息进入窗口，即使窗口的大小没有改变
Public
Const
SWP_DRAWFRAME
=
SWP_FRAMECHANGED
'围绕窗口画一个框
Public
Const
SWP_HIDEWINDOW
=
H80
'隐藏窗口
Public
Const
SWP_NOACTIVATE
=
H10
'不激活窗口
Public
Const
SWP_NOMOVE
=
H2
'保持当前位置
(x和y设定将被忽略)
Public
Const
SWP_NOREDRAW
=
H8
'窗口不自动重画
Public
Const
SWP_NOSIZE
=
H1
'保持当前大小
(cx和cy会被忽略)
Public
Const
SWP_NOZORDER
=
H4
'保持窗口在列表的当前位置
(hWndInsertAfter将被忽略)
Public
Const
SWP_SHOWWINDOW
=
H40
'显示窗口
'用法示例
SetWindowPos
Form1.hwnd,
HWND_TOPMOST,
0,
0,
0,
0,
SWP_NOMOVE
Or
SWP_NOSIZE
你可以这样做，设置窗体的TopMost 属性为真！
Me.TopMost = True
Form.TopMost 属性
获取或设置一个值，指示该窗体是否应显示为最顶层窗体。
用SetWindowPos,参数TOP_MOST
就是直接设置窗口的TOPMOST属性也行啊，把默认的false改成true,自己在窗口的属性列表里找找吧
用SetWindowPos函数，通用部分声明：Private Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
Private Const a = -1
Private Const b = H1
Private Const c = H2窗体部分：
Private Sub Form_Load()
SetWindowPos Me.hwnd, a, 0, 0, 0, 0, b Or c
End Sub这个是在窗体加载的时候置顶，SetWindowPos Me.hwnd, a, 0, 0, 0, 0, b Or c 是窗体置顶的实现代码如果你要按下按钮就实现指定可以把它添加到command1_click事件中即可
你说的是保持在最前面吧！你再说明白点！
Private Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, _
ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, _
ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long)
Private Sub Form_Load()
Call SetWindowPos(Me.hwnd, -1, 0, 0, 0, 0, 3)
'其它代码
End Sub
将下面的代码复制到记事本中，并将其保持为Form1.frm
VERSION 5.00
Begin VB.Form Form1
BorderStyle = 0 'None
ClientHeight = 4695
ClientLeft = 0
ClientTop = 0
ClientWidth = 6975
LinkTopic = "Form1"
ScaleHeight = 4695
ScaleWidth = 6975
ShowInTaskbar = 0 'False
StartUpPosition = 3 '窗口缺省
Begin VB.Shape Shape3
BackColor = H000080FF
BackStyle = 1 'Opaque
BorderStyle = 0 'Transparent
Height = 855
Left = 3480
Shape = 3 'Circle
Top = 960
Width = 975
End
Begin VB.Shape Shape2
BackColor = H000080FF
BackStyle = 1 'Opaque
BorderStyle = 0 'Transparent
Height = 855
Left = 1560
Shape = 3 'Circle
Top = 960
Width = 975
End
Begin VB.Shape Shape1
BackColor = H000080FF
BackStyle = 1 'Opaque
BorderStyle = 0 'Transparent
Height = 1095
Left = 1920
Shape = 2 'Oval
Top = 1320
Width = 2055
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, _
ByVal hWndInsertAfter As Long, ByVal X As Long, ByVal Y As Long, _
ByVal cx As Long, ByVal cy As Long, ByVal wFlags 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 SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long
Dim mouse_x As Single
Dim mouse_y As Single
Private Sub Form_Load()
Call SetWindowPos(Me.hwnd, -1, 0, 0, 0, 0, 3)
Me.BackColor = HFF0000
Dim rtn As Long
BorderStyler = 0
rtn = GetWindowLong(hwnd, -20)
rtn = rtn Or H80000
SetWindowLong hwnd, -20, rtn
SetLayeredWindowAttributes hwnd, HFF0000, 0, H1
End Sub
Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
mouse_x = 0
mouse_y = 0
If Button = 1 Then
mouse_x = X
mouse_y = Y
End If
End Sub
Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 1 Then
Form1.Left = Form1.Left + (X - mouse_x)
Form1.Top = Form1.Top + (Y - mouse_y)
End If
End Sub