vb.netkey vbnet可以开发手机应用吗

有关VB.NET keypress 事件的问题

定义两个变量

Private run As Boolean = False'过程是否在运行

Private Key_L As Boolean = False'L键是否按下

变通方法：加定时器，要执行的过程放在定时器中调用

keypress事件只检测某个键是否按下

在家里没有VS，引用我以前的例子给你，定义的是全局键盘，也就是在程序不激活的状态也能执行

下面是完整代码： ----按下L键过程xx只会执行一次，直到过程执行完成才再次响应

Public Class Form1

Private run As Boolean = False

Private Key_L As Boolean = False

Public Declare Auto Function RegisterHotKey Lib "user32.dll" Alias _

"RegisterHotKey" (ByVal hwnd As IntPtr, ByVal id As Integer, ByVal fsModifiers As Integer, ByVal vk As Integer) As Boolean

Public Declare Auto Function UnRegisterHotKey Lib "user32.dll" Alias _

"UnregisterHotKey" (ByVal hwnd As IntPtr, ByVal id As Integer) As Boolean

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

'注册全局热键

RegisterHotKey(Handle, 0, 7, Keys.C)

RegisterHotKey(Handle, 1, Nothing, Keys.L)

' 0=nothing 1 -alt 2-ctrl 3-ctrl+alt 4-shift 5-alt+shift 6-ctrl+shift 7-ctrl+shift+alt

End Sub

Private Sub Form1_Closed(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Closed

UnRegisterHotKey(Handle, 0)

UnRegisterHotKey(Handle, 1)

End Sub

Protected Overrides Sub WndProc(ByRef m As Message)

If m.Msg = 786 Then

If m.WParam.ToInt32 = 1 Then

Key_L = True

'MsgBox(m.Msg "我1")

ElseIf m.WParam.ToInt32 = 0 Then

MsgBox(m.Msg "我2")

End If

'TextBox1.Text = " " m.Msg

End If

MyBase.WndProc(m)

End Sub

Sub xx()

run = True

Button1.Enabled = False

For i = 0 To 100

TextBox1.Text = i.ToString

Threading.Thread.Sleep(1)

Application.DoEvents()

Next

Button1.Enabled = True

Key_L = False

run = False

End Sub

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

If run = True Then Exit Sub

If Key_L = True Then xx()

End Sub

End Class

VB.NET中keypress、keydown、keyup事件有什么区别？e.keychar和e.keycode的区别？

keypress:操作窗格具有焦点并按下某个键时发生,不能由非字符键引发

keydown:按下键盘按键时发生

keyup:键盘按键弹起时发生

以上事件触发vb.netkey的时间不同,顺序 down press up

keychar:按键对应vb.netkey的字符

keycode:获取 KeyDown 或 KeyUp 事件vb.netkey的键盘代码

char不能获取 控制键如tab Insert delete 方向键等

vb.net 响应窗体keydown不响应控件

在button1的Click事件处理方法中加上一句试试看

private void button1_Click(object sender, EventArgs e)

{

    // 原来的代码不变……

    

    // 最后加上这句

   this.Focus();

}

另外，必须保让你窗口是当前活动窗口！

VB.net KeyPress

'只允许输入0至9以及倒退键的示例

If (e.KeyChar = Chr(Asc("0")) And e.KeyChar = Chr(Asc("9"))) Or e.KeyChar = Chr(8) Then Exit Sub

e.KeyChar = Chr(0) ‘拦截其他键值

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