VB.net KeyPress

'只允许输入0至9以及倒退键的示例

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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

vb.net,怎么做全局快捷键？？

'vb全局快捷键是个大大滴难题，不好整。以下是个演示，办法比较笨，本人自用的，你试试。

'窗体放上控件：Command1、Label1、Check1、Check2、Text1、Text2、Timer1

'加入以下代码，运行，设置"确定"键的快捷键

'可选"CTRL+某键"或者"SHIFT+某键"

'"某键"自己设置，只能设置为字母或数字

Private Declare Function GetAsyncKeyState Lib "user32" _

(ByVal vKey As Long) As Integer 'API声明

Dim i

'================================================================

'这部分是设置各控件的大小、位置和初始属性，为了便于演示才加的，

'你可以自行设计好各控件的大小、位置和初始属性，无需这些代码。

Private Sub Form_Load()

Form1.Width = 2690: Form1.Height = 2100

Command1.Width = 1215: Command1.Height = 495

Command1.Top = 120: Command1.Left = 120

Command1.Caption = "确定"

Label1.Width = 2175: Label1.Height = 255

Label1.Top = 720: Label1.Left = 120

Label1.Caption = "设置 确定 键的快捷键："

Check1.Width = 975: Check1.Height = 255

Check1.Top = 960: Check1.Left = 120

Check1.Caption = "CTRL +"

Check2.Width = 975: Check2.Height = 255

Check2.Top = 1320: Check2.Left = 120

Check2.Caption = "SHIFT +"

Text1.Width = 255: Text1.Height = 270

Text1.Top = 960: Text1.Left = 1080

Text1.Text = ""

Text2.Width = 255: Text2.Height = 270

Text2.Top = 1320: Text2.Left = 1080

Text2.Text = ""

Timer1.Interval = 10 'Timer的属性，必须设置

End Sub

'以上部分是设置各控件的大小、位置和初始属性，为了便于演示才加的，

'你可以自行设计好各控件的大小、位置和初始属性，无需这些代码。

'================================================================

Private Sub Timer1_Timer()

If Text1 "" Then

If Len(Text1) 1 Then Text1 = Left(Text1, 1)

If Asc("a") = Asc(Text1) And Asc(Text1) = Asc("z") _

Then Text1 = Chr(Asc(Text1) - 32)

If Check1.Value = 1 And GetAsyncKeyState(vbKeyControl) 0 _

And GetAsyncKeyState(Asc(Text1)) 0 Then

i = i + 1

If i = 1 Then Call Command1_Click

Else

i = 0

End If

End If

If Text2 "" Then

If Len(Text2) 1 Then Text2 = Left(Text2, 1)

If Asc("a") = Asc(Text2) And Asc(Text2) = Asc("z") _

Then Text2 = Chr(Asc(Text2) - 32)

If Check2.Value = 1 And GetAsyncKeyState(vbKeyShift) 0 _

And GetAsyncKeyState(Asc(Text2)) 0 Then

i = i + 1

If i = 1 Then Call Command1_Click

Else

i = 0

End If

End If

End Sub

Private Sub Command1_Click()

print "你好"

SendKeys "你好"

End Sub

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 keypress问题

Private Sub DataGridView1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles DataGridView1.KeyPress

Select Case Asc(e.KeyChar)

Case 13

SendKeys.SendWait("{TAB}")

SendKeys.SendWait("{UP}")

End Select

End Sub

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

以上事件触发的时间不同,顺序 down press up

keychar:按键对应的字符

keycode:获取 KeyDown 或 KeyUp 事件的键盘代码

char不能获取 控制键如tab Insert delete 方向键等

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