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Const
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GWL_EXSTYLE
=
(-20)
Const
WS_EX_LAYERED
=
H80000
Const
WS_EX_
TRANSPARENT
As
Long
=
H20
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
Sub
Command1_Click()
SetWindowLong
Me.hwnd,
GWL_EXSTYLE,
GetWindowLong(Me.hwnd,
GWL_EXSTYLE)
Or
WS_EX_LAYERED
Or
WS_EX_TRANSPARENT
End
Sub
'取消鼠标穿透(一般窗体)
SetWindowLong
Me.hwnd,
GWL_EXSTYLE,
'取消鼠标穿透(UpdateLayeredWindow画窗体)
SetWindowLong
Me.hwnd,
GWL_EXSTYLE,
WS_EX_LAYERED
Declare Sub mouse_event Lib "user32" Alias "mouse_event" (ByVal dwFlags As Integer, ByVal dx As Integer, ByVal dy As Integer, ByVal cButtons As Integer, ByVal dwExtraInfo As Integer)
Dim postion1 As New Point
mouse_event(H1 Or H8000, postion1.X * 65535 / 1366, postion1.Y * 65535 / 768, 0, 0)
'按绝对位置移动鼠标
'在鼠标坐标系统中，屏幕在水平和垂直方向上均匀分割成65535×65535个单元，
'当前所用显示屏分辨率为1366*768
'所以要进行如上转换
mouse_event(H2, 0, 0, 0, 0) '鼠标左键按下
mouse_event(H4, 0, 0, 0, 0) '鼠标左键弹起
msdn上有 mouse_event 的详解，大致使用如上
调用api
在Visual Baisc.net中的声明：
Declare Sub mouse_event Lib "user32" (ByVal dwFlags As Long, ByVal dx As Long, ByVal dy As Long, ByVal cButtons As Long, ByVal dwExtraInfo As Long)
Public Const MOUSEEVENTF_LEFTDOWN = H2 '模拟鼠标左键按下
Public Const MOUSEEVENTF_LEFTUP = H4 ’模拟鼠标左键释放
Public Const MOUSEEVENTF_MIDDLEDOWN = H20 '模拟鼠标中间键按下
Public Const MOUSEEVENTF_MIDDLEUP = H40 '模拟鼠标中间键释放
Public Const MOUSEEVENTF_RIGHTDOWN = H8 '模拟鼠标右键按下
Public Const MOUSEEVENTF_RIGHTUP = H10 '模拟鼠标右键释放
Public Const MOUSEEVENTF_MOVE = H1 '模拟鼠标指针移动
例：
mouse_event MOUSEEVENTF_LEFTDOWN,10,10,0,0
'在（10，10）模拟鼠标左键按下
很简单，通过WindowsAPI，删除窗体菜单项就行了
首先在窗体类中声明API：
Declare Function GetSystemMenu Lib "user32" (ByVal hWnd As IntPtr, ByVal bRevert As Boolean) As IntPtr
Declare Function RemoveMenu Lib "user32" (ByVal lngHmenu As IntPtr, ByVal nPosition As Integer, ByVal wFlags As Integer) As Integer
其次声明API参数常量：
Const MF_BYPOSITION As Integer = H400
然后在窗体类中写入过程：
Private Sub UserForm_Initialize_stopmove() '禁止窗体移动
Dim lngHwnd As IntPtr
Dim lngHmenu As IntPtr
lngHwnd = Me.Handle
If lngHwnd 0 Then
lngHmenu = GetSystemMenu(lngHwnd, False)
RemoveMenu(lngHmenu, 0, MF_BYPOSITION) '这里的0代表菜单中从上往下数第一个菜单项
End If
End Sub
Private Sub UserForm_Initialize_onmove() '恢复窗体移动
Dim lngHwnd As IntPtr
Dim lngHmenu As IntPtr
lngHwnd = Me.Handle
If lngHwnd 0 Then
lngHmenu = GetSystemMenu(lngHwnd, True)
RemoveMenu(lngHmenu, 0, MF_BYPOSITION) '这里的0与禁止代码中的数值同步，原因时虽然表面上删除了菜单项，实则为隐藏了菜单项，各个菜单的索引值并没有变，所以0依然代表初始菜单的第一个菜单项，即被删除的那个菜单项
End If
End Sub
然后如果你的窗口菜单是动态变化的，建议声明常数：
Const MF_BYPOSITION As Integer = H0
然后使用相关的Windows功能的常数进行删除菜单。常数需要自行查看winuser.h头文件
如果找不到该头文件，可以看这里：网页链接
其余信息详见MSDN：网页链接
最后说一下，不建议前面网友说的重写WndProc的方法，因为这样拦截标题栏点击消息会导致窗体本身的菜单也无法显示出来，有损窗体功能，并且像双击左上角图标关闭窗体这样的功能也会跟着拦截消息的操作一起被吞掉。
Const GWL_EXSTYLE = (-20)
Const WS_EX_LAYERED = H80000
Const WS_EX_TRANSPARENT As Integer= H20
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Integer, ByVal nIndex As Integer) As Integer
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Integer, ByVal nIndex As Integer, ByVal dwNewLong As Integer) As Integer
Private Sub Command1_Click()
SetWindowLong Me.hwnd, GWL_EXSTYLE, GetWindowLong(Me.hwnd, GWL_EXSTYLE) Or WS_EX_LAYERED Or WS_EX_TRANSPARENT
End Sub
'取消鼠标穿透(一般窗体) SetWindowLong Me.hwnd, GWL_EXSTYLE, 0
'取消鼠标穿透(UpdateLayeredWindow画窗体) SetWindowLong Me.hwnd, GWL_EXSTYLE, WS_EX_LAYERED