在窗體的on key press \ on key down事件里面判斷,并根據(jù)你的限制條件決定是否show你的窗體
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用API ?GetKeyboardState?,判斷所有的鍵里哪些被按下了。
下面的是判斷鍵盤燈的狀態(tài)
Public?Class?NativeMethods
Private?Shared?keyState()?As?Byte
DllImport("user32.dll")?_
Private?Shared?Function?GetKeyboardState(ByVal?keyState()?As?Byte)?As?Boolean
End?Function
Private?Shared?Sub?Update()
keyState?=?New?Byte(256)?{}
Dim?result?As?Boolean?=?GetKeyboardState(keyState)
'?Check?for?error:
If?result?=?False?Then
Debug.WriteLine("GetKeyBoardState?error:?"??Marshal.GetLastWin32Error)
Throw?New?Exception("GetKeyBoardState?error:?"??Marshal.GetLastWin32Error)
End?If
End?Sub
Public?Enum?LightState
Off
[On]
End?Enum
'?Example?-?the?keyboard?lights...
Public?Shared?ReadOnly?Property?CapsLockState()?As?LightState
Get
Update()
Dim?isOn?As?Boolean?=?(keyState(Keys.CapsLock)?=?1)
Return?IIf(isOn,?LightState.On,?LightState.Off)
End?Get
End?Property
Public?Shared?ReadOnly?Property?NumLockState()?As?LightState
Get
Update()
Dim?isOn?As?Boolean?=?(keyState(Keys.NumLock)?=?1)
Return?IIf(isOn,?LightState.On,?LightState.Off)
End?Get
End?Property
Public?Shared?ReadOnly?Property?ScrollLockState()?As?LightState
Get
Update()
Dim?isOn?As?Boolean?=?(keyState(Keys.Scroll)?=?1)
Return?IIf(isOn,?LightState.On,?LightState.Off)
End?Get
End?Property
End?Class
這就要調(diào)用API函數(shù)了 給你代碼吧 記得給點(diǎn)分啊
Private Const KeysM = H8000
Private Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As Integer
Private Sub TextBox1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox1.KeyDown
Me.Text = e.KeyValue
If e.KeyValue = Keys.ShiftKey And GetAsyncKeyState(160) And KeysM Then
MsgBox("你按的是左SHIFT")
ElseIf e.KeyValue = Keys.ShiftKey And GetAsyncKeyState(161) And KeysM Then
MsgBox("你按的是右SHIFT")
End If
End Sub
窗體內(nèi)檢測(cè)按鍵
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Me.KeyPreview = True '注冊(cè)窗體的鍵盤事件
End Sub
在TextBox1中顯示按鍵代碼
Private Sub Form1_KeyDown(sender As Object, e As KeyEventArgs) Handles Me.KeyDown
TextBox1.Text = Str(e.KeyCode) + vbCrLf
End Sub
窗體沒有焦點(diǎn),用窗體監(jiān)測(cè)鍵盤輸入緩沖區(qū)可以解決,但這似乎可以用于監(jiān)測(cè)用戶輸入內(nèi)容,不要用于非法目的呀!所以就是知道也不會(huì)告訴你的。
當(dāng)前文章:vb.net檢測(cè)按鍵 vbs檢測(cè)按鍵是否按下
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