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如何让自定义的菜单右上角的 X （关闭）失效 ？

beforeCloseProject事件

e.cancel =  not vars("允许关闭")

如果要关闭，就赋值再关闭

vars("允许关闭") = true

mark 禁用关闭按钮

全局代码

Public Const SC_CLOSE As Integer = &Hf060
Public Const MF_ENABLED As Integer = &H0
Public Const MF_GRAYED As Integer = &H1
Public Const MF_DISABLED As Integer = &H2

<DllImport("user32.dll", EntryPoint := "GetSystemMenu")> _
Public Function GetSystemMenu(hWnd As IntPtr, bRevert As Integer) As IntPtr
End Function

<DllImport("User32.dll")> _
Public Function EnableMenuItem(hMenu As IntPtr, uIDEnableItem As Integer, uEnable As Integer) As Boolean
End Function

调用代码

Dim hMenu As IntPtr = GetSystemMenu(basemainform.Handle, 0)
EnableMenuItem(hMenu, SC_CLOSE, (MF_DISABLED + MF_GRAYED) Or MF_ENABLED)