VB中怎么让From1的关闭键失灵？

简单的办法：把Form的ControlBox设置为False。
麻烦的办法：用API函数。代码如下。
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Option Explicit
Private Declare Function GetSystemMenu Lib "user32" (ByVal hwnd As Long, ByVal bRevert As Long) As Long
Private Declare Function GetMenuItemCount Lib "user32" (ByVal hMenu As Long) As Long
Private Declare Function RemoveMenu Lib "user32" (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long) As Long
Private Declare Function DrawMenuBar Lib "user32" (ByVal hwnd As Long) As Long
Private Const MF_BYPOSITION = &H400&
Private Const MF_REMOVE = &H1000&
Private Sub Form_Load()
Dim hMenu As Long
Dim nCount As Long
hMenu = GetSystemMenu(hwnd, 0)
nCount = GetMenuItemCount(hMenu)
Call RemoveMenu(hMenu, nCount - 1, MF_REMOVE Or MF_BYPOSITION)
Call RemoveMenu(hMenu, nCount - 2, MF_REMOVE Or MF_BYPOSITION)
End Sub