vb编程 如何让一个WINDOWS窗口置顶

Option Explicit

Private Const HWND_TOPMOST = -1

Private Const HWND_BOTTOM = 1

Private Const HWND_NOTOPMOST = -2

Private Const SWP_NOSIZE = &H1

Private Const SWP_NOMOVE = &H2

Private Const SWP_NOZORDER = &H4

Private Const SWP_NOACTIVATE = &H10

Private Const SWP_SHOWWINDOW = &H40

Private Const SWP_HIDEWINDOW = &H80

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 Sub Command1_Click()

SetWindowPos MehWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOACTIVATE Or SWP_SHOWWINDOW Or SWP_NOSIZE Or SWP_NOMOVE'置顶

End Sub

Private Sub Command2_Click()

SetWindowPos MehWnd, HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOACTIVATE Or SWP_SHOWWINDOW Or SWP_NOSIZE Or SWP_NOMOVE'不置顶

End Sub

这个只要获取他的窗口句柄就可以了

whWnd 是 窗口句柄

SetWindowPos whWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOACTIVATE Or SWP_SHOWWINDOW Or SWP_NOSIZE Or SWP_NOMOVE'置顶

用API

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

Public Const SWP_NOMOVE = &H2

Public Const SWP_NOSIZE = &H1

Public Const SWP_NOZORDER = &H8

将下面的子程序放到模块中

Public Sub SetFormTopmost(TheForm As Form)

SetWindowPos TheFormhwnd, HWND_TOPMOST, 0, 0, 0, 0, _

SWP_NOZORDER + SWP_NOMOVE + SWP_NOSIZE

End Sub

最后，通过调用该子程序设置你想要放置的窗体。例如，你想将窗体frmMyForm放在最前面，代码如下：

SetFormTopmost frmMyForm

'设置顶层窗口的API函数

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

SetWindowPos Mehwnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE Or SWP_NOSIZE '调用api函数SetWindowPos使窗体不能被遮盖

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