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vb.net键盘按键 vba用键盘按键
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相关问答
Q1: vb.net 怎么知道按下了多个按键
用API GetKeyboardState ，判断所有的键里哪些被按下了。
下面的是判断键盘灯的状态
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
Q2: vb.net中如何执行键盘事件？
执行键盘事件方法如下：
第一步，点击VS工具。
第二步，打开后，新建一个Windows窗体应用程序。
第三步，请看右下方Form的属性栏。
第四步，双击KeyDown。
第五步，输入提示按键代码，如图所示。
第六步，再次输入代码，设置属性KeyPreview为true。
第七步，运行程序，按下举例F5，则会弹出提示，表明已经成功获。
Q3: vb.net在for循环中如何获取键盘按键
Public Sub TextBox_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs)
Dim SplitStr As String = ","
Dim SelectionStart As Integer = sender.SelectionStart
Dim TextLength As Integer = sender.Text.Length
'------------------------------------------------------------------
Select Case Asc(e.KeyChar)
Case Is = 8 '"回删"
Dim str As String = sender.text
Dim Array = Split(sender.text, ",", -1)
If sender.SelectionStart = str.Length Then
If str.Contains(",") Then
Dim text = ""
For x = 0 To UBound(Array) - 1
If text = "" Then
text += Array(x)
Else
text += "," + Array(x)
End If
Next
sender.text = text
sender.SelectionStart = text.Length
e.KeyChar = Chr(0)
End If
End If
Case Asc("0") To Asc("9") '" 0 to 9 "
e.KeyChar = e.KeyChar
Case Is = 44, 45 '","
Select Case TextLength
Case Is = 0
e.KeyChar = Chr(0)
Case Else
Select Case SelectionStart
Case 0
e.KeyChar = Chr(0)
Case 1 To TextLength - 1
If Mid(sender.text, SelectionStart, 1) = SplitStr Or Mid(sender.text, SelectionStart + 1, 1) = SplitStr Then
e.KeyChar = Chr(0)
Else
e.KeyChar = e.KeyChar
End If
Case TextLength
If Mid(sender.text, SelectionStart, 1) = SplitStr Then
e.KeyChar = Chr(0)
Else
e.KeyChar = e.KeyChar
End If
End Select
End Select
Case Else
e.KeyChar = Chr(0)
End Select
End Sub
这是vb.net键盘按键我vb.net键盘按键的程序中复制过来vb.net键盘按键的,只能输入数据字与逗号还有下划线,vb.net键盘按键你查一下F和Jvb.net键盘按键的Ass吗是多少,改写一下就OK
Q4: vb.net中，如何通过键盘上的按键触发button _click事件
1、将窗口的KeyPreview属性设置为True
Me.KeyPreview = True
2、处理窗口的KeyDown事件
Sub MainFormKeyDown(sender As Object, e As KeyEventArgs)
Select Case e.KeyCode
Case Keys.Escape
Me.button1.PerformClick
Case Keys.Enter
Me.button2.PerformClick
End Select
End Sub
Q5: 在VB.NET中如何实现键盘上两个键长按！在线等~~
长按你可以用计时器来实现啊，写个例子：
Private blCtrl As Boolean = False
Private Sub Form1_KeyDown(sender As Object, e As KeyEventArgs) Handles Me.KeyDown
If e.KeyCode = Keys.LControlKey Then blCtrl = True
End Sub
Private Sub Form1_KeyUp(sender As Object, e As KeyEventArgs) Handles Me.KeyUp
If e.KeyCode = Keys.LControlKey Then blCtrl = False
End Sub
然后你可以在计时器里检测blCtrl的状态来确定，不知道你的具体情况是什么样的
总之是用一个布尔变量来记录按键状态，配合计时器来达到你想要的功能
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