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窗体问题：如何使某个窗体永远在最上层

楼主jxgzay（jxgzay）2005-07-04 10:55:20 在 VB / 基础类提问

form1为全屏最大华窗体，FORM2为播放AVI的演示窗体，FORM1下一个COMMAND1，

Private Sub Command1_Click()
Form2.Show
End Sub
现在当FORM1获得焦点时，FORM2就被覆盖了，如何让form2在最上层？我用：当FORM2失去焦点时或FORM1获得焦点时，Form2.ZOrder 无效。

就是想实现一边操作mis（输入资料、切换其他窗体等）,一边看VCD的效果。
问题点数：20、回复次数：9Top

1 楼w3k（网络3K）回复于 2005-07-04 11:02:53 得分 1

Private Sub Command1_Click()
Form2.Show 1
End Sub
FORM2的为可用,但关闭form2时,FORM1获得焦点Top

2 楼LBwu（大鸟）回复于 2005-07-04 11:03:47 得分 2

BOOL SetWindowPos(
HWND hWnd, // handle to window
HWND hWndInsertAfter, // placement-order handle
int X, // horizontal position
int Y, // vertical position
int cx, // width
int cy, // height
UINT uFlags // window-positioning flags
);

Parameters
hWnd
Handle to the window.
hWndInsertAfter
Handle to the window to precede the positioned window in the Z order. This parameter must be a window handle or one of the following values: Value Meaning
HWND_BOTTOM Places the window at the bottom of the Z order. If the hWnd parameter identifies a topmost window, the window loses its topmost status and is placed at the bottom of all other windows.
HWND_NOTOPMOST Places the window above all non-topmost windows (that is, behind all topmost windows). This flag has no effect if the window is already a non-topmost window.
HWND_TOP Places the window at the top of the Z order.
HWND_TOPMOST Places the window above all non-topmost windows. The window maintains its topmost position even when it is deactivated.

For more information about how this parameter is used, see the following Remarks section.

X
Specifies the new position of the left side of the window, in client coordinates.
Y
Specifies the new position of the top of the window, in client coordinates.
cx
Specifies the new width of the window, in pixels.
cy
Specifies the new height of the window, in pixels.
uFlags
Specifies the window sizing and positioning flags. This parameter can be a combination of the following values: Value Meaning
SWP_ASYNCWINDOWPOS If the calling thread does not own the window, the system posts the request to the thread that owns the window. This prevents the calling thread from blocking its execution while other threads process the request.
SWP_DEFERERASE Prevents generation of the WM_SYNCPAINT message.
SWP_DRAWFRAME Draws a frame (defined in the window's class description) around the window.
SWP_FRAMECHANGED Sends a WM_NCCALCSIZE message to the window, even if the window's size is not being changed. If this flag is not specified, WM_NCCALCSIZE is sent only when the window's size is being changed.
SWP_HIDEWINDOW Hides the window.
SWP_NOACTIVATE Does not activate the window. If this flag is not set, the window is activated and moved to the top of either the topmost or non-topmost group (depending on the setting of the hWndInsertAfter parameter).
SWP_NOCOPYBITS Discards the entire contents of the client area. If this flag is not specified, the valid contents of the client area are saved and copied back into the client area after the window is sized or repositioned.
SWP_NOMOVE Retains the current position (ignores the X and Y parameters).
SWP_NOOWNERZORDER Does not change the owner window's position in the Z order.
SWP_NOREDRAW Does not redraw changes. If this flag is set, no repainting of any kind occurs. This applies to the client area, the nonclient area (including the title bar and scroll bars), and any part of the parent window uncovered as a result of the window being moved. When this flag is set, the application must explicitly invalidate or redraw any parts of the window and parent window that need redrawing.
SWP_NOREPOSITION Same as the SWP_NOOWNERZORDER flag.
SWP_NOSENDCHANGING Prevents the window from receiving the WM_WINDOWPOSCHANGING message.
SWP_NOSIZE Retains the current size (ignores the cx and cy parameters).
SWP_NOZORDER Retains the current Z order (ignores the hWndInsertAfter parameter).
SWP_SHOWWINDOW Displays the window.

Return Values
If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, callGetLastError.

调用这个api就可以了~~~
Top

3 楼jxgzay（jxgzay）回复于 2005-07-04 11:09:07 得分 0

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
Const HWND_TOPMOST = -1
Const SWP_SHOWWINDOW = &H40
Private Sub Form_load()
Dim retValue As Long
'将窗体设置为处于所有窗口的顶层，注意在 VB 中运行时，可能不行，但编译成EXE后就可以了
retValue = SetWindowPos(Me.hwnd, HWND_TOPMOST, Me.CurrentX, Me.CurrentY, 300, 300, SWP_SHOWWINDOW)
End Sub

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4 楼wangtopcool（逆水行舟,不进则退）回复于 2005-07-04 11:16:14 得分 5

用api函数
Public Declare Function SetParent Lib "user32" (ByVal hWndChild As Long, ByVal hWndNewParent As Long) As Long
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
Public Const HWND_TOPMOST = -1

在form1上放两个按钮
Private Sub Command1_Click()
SetParent Form2.hWnd, Form1.hWnd
Form2.Visible = True
End Sub

Private Sub Command2_Click()
Unload Form2
End Sub

Private Sub Form_Load()
SetWindowPos Me.hWnd, HWND_TOPMOST, 0, 0, 0, 0, 0
End SubTop

5 楼bee6803（欢笑人生）回复于 2005-07-04 11:16:31 得分 5

Public Declare Function SetWindowPos Lib "user32" (ByVal hWnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, y, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
' Various constants used by the above functions
Public Const HWND_TOPMOST = -1
Public Const HWND_NOTOPMOST = -2
Public Const TOPMOST_FLAGS = SWP_NOMOVE Or SWP_NOSIZE

Public Sub AlwaysOnTop(TheForm As Form, Toggle As Boolean)
' TheForm: 窗体是否置顶
' Toggle: Boolean (True/False) - True 永远置顶 , False 正常

If Toggle = True Then
SetWindowPos TheForm.hWnd, HWND_TOPMOST, 0, 0, 0, 0, TOPMOST_FLAGS
Else
SetWindowPos TheForm.hWnd, HWND_NOTOPMOST, 0, 0, 0, 0, TOPMOST_FLAGS
End If
End Sub
'窗体调用

Private Sub Form_Load()
AlwaysOnTop Me, True
End SubTop

6 楼bee6803（欢笑人生）回复于 2005-07-04 11:18:44 得分 5

'模块中定义API
Public Declare Function SetWindowPos Lib "user32" (ByVal hWnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, y, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
' Various constants used by the above functions
Public Const HWND_TOPMOST = -1
Public Const HWND_NOTOPMOST = -2
Public Const TOPMOST_FLAGS = SWP_NOMOVE Or SWP_NOSIZE
''模块中定义
Public Sub AlwaysOnTop(TheForm As Form, Toggle As Boolean)
' TheForm: 窗体名称
' Toggle: Boolean (True/False) - True 永远置顶 , False 正常

If Toggle = True Then
SetWindowPos TheForm.hWnd, HWND_TOPMOST, 0, 0, 0, 0, TOPMOST_FLAGS
Else
SetWindowPos TheForm.hWnd, HWND_NOTOPMOST, 0, 0, 0, 0, TOPMOST_FLAGS
End If
End Sub
'窗体调用

Private Sub Form_Load()
AlwaysOnTop Me, True
End Sub
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7 楼wosirius（神经第六）回复于 2005-07-04 13:16:00 得分 0

mTop

8 楼penguinMII（企鹅）回复于 2005-07-04 14:25:12 得分 1

用AIP函数就可以了。
楼上都说完了。。。。Top

9 楼fujlt（菜鸟）回复于 2005-07-04 15:32:56 得分 1

同上 SetWindowPosTop