笨办法:
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加个菜单控件,设置个空选项
再把这个菜单选项的快捷键设置成ctrl+alt+del
.net的代码真木有写过。
VB 可以屏蔽 包括ctrl+alt+del在内的所有键盘按键消息
其实你只要后台截获按键的消息后，直接屏蔽掉就可以了。
VB代码我有 net木有。
最简单的就是把属性改一下,效果跟无框的差不多。
Me.FormBorderStyle = Windows.Forms.FormBorderStyle.FixedSingle
Me.ControlBox = False
Me.MaximizeBox = False
Me.Text = ""
至于hook的问题,它确实是比系统慢了一步得到消息,当前线程或全局的都一样,不过你可以先拦截Windows键或者Up键其中一键来阻拦组合键。
只是文本框的话:
Private Const charSet As String = "abcdefghijklmnopqrstuvwxyz"
Private Sub textbox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles textbox1.KeyPress
If charSet.IndexOf(e.KeyChar) = -1 And e.KeyChar "" Then
e.Handled = True
End If
End Sub
这样只能输入charset 规定的字符
'点击窗体隐藏，按Alt
+
Tab回调窗体
Option
Explicit
Private
Declare
Function
GlobalAddAtom
Lib
"kernel32"
Alias
"GlobalAddAtomA"
(ByVal
lpString
_
As
String)
As
Integer
'为全局热键添加一个标识符
Private
Declare
Function
RegisterHotKey
Lib
"user32"
(ByVal
hWnd
As
Long,
ByVal
ID
As
Long,
_
ByVal
fsModifiers
As
Long,
ByVal
vk
As
Long)
As
Long
'hWnd：接收热键产生WM_HOTKEY消息的窗口句柄
'id：定义热键的标识符,GlobalAddAtom函数获得热键的标识符.
'MOD_ALT为Alt键，MOD_CONTROL为Ctrl键，MOD_SHIFT为Shift键，MOD_WIN为Windows按键。
'vk：定义热键的虚拟键码。
Private
Declare
Function
UnregisterHotKey
Lib
"user32"
(ByVal
hWnd
As
Long,
ByVal
ID
As
Long
_
)
As
Long
Private
Declare
Function
PeekMessage
Lib
"user32"
Alias
"PeekMessageA"
(lpMsg
As
Msg,
ByVal
_
hWnd
As
Long,
ByVal
wMsgFilterMin
As
Long,
ByVal
wMsgFilterMax
As
Long,
ByVal
_
wRemoveMsg
As
Long)
As
Long
Private
Declare
Function
WaitMessage
Lib
"user32"
()
As
Long
Private
Type
POINTAPI
x
As
Long
y
As
Long
End
Type
Private
Type
Msg
hWnd
As
Long
Message
As
Long
wParam
As
Long
lParam
As
Long
time
As
Long
pt
As
POINTAPI
End
Type
Const
MOD_ALT
=
H1
Const
PM_REMOVE
=
H1
Const
WM_HOTKEY
=
H312
Dim
HotKey_ID
As
Long
Private
HotKey_Flg
As
Boolean
Dim
Message
As
Msg
Private
Sub
Form_Click()
Me.Hide
HotKey_ID
=
GlobalAddAtom("Alt
+
Tab")
'RegisterHotKey
Me.hWnd,
HBFFF,
MOD_CONTROL
+
MOD_ALT,
vbKeyG
'注册
Ctrl+Alt+
G
为热键
RegisterHotKey
Me.hWnd,
HotKey_ID,
MOD_ALT,
9
'注册
Ctrl+Alt+
G
为热键
Me.Hide
HotKey_Flg
=
False
Do
While
Not
HotKey_Flg
WaitMessage
'等待消息
If
PeekMessage(Message,
Me.hWnd,
WM_HOTKEY,
WM_HOTKEY,
PM_REMOVE)
Then
'检查是否热键被按下
''''可以在此写入你要阻止的代码
Me.Show
End
If
DoEvents
'转让控制权,允许操作系统处理其他事件
Loop
End
Sub
Private
Sub
Form_Unload(Cancel
As
Integer)
'撤销热键的注册
HotKey_Flg
=
True
Call
UnregisterHotKey(Me.hWnd,
HotKey_ID)
End
Sub