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vb.net虚拟键常量 vbnet button

vb虚拟按键码怎么转换呢

我前面说的只是编程的技巧,如果你单纯是为了让代码好看,那么像我那么做即可,如果你是非要转换键码的键名,用下面的代码:

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Private

Declare

Function

GetKeyNameText

Lib

"user32"

Alias

"GetKeyNameTextA"

(ByVal

lParam

As

Long,

ByVal

lpBuffer

As

String,

ByVal

nSize

As

Long)

As

Long

Private

Declare

Function

MapVirtualKey

Lib

"user32"

Alias

"MapVirtualKeyA"

(ByVal

wCode

As

Long,

ByVal

wMapType

As

Long)

As

Long

Private

Sub

Form_KeyDown(KeyCode

As

Integer,

Shift

As

Integer)

Dim

s

As

String

s

=

String(100,

Chr(0))

GetKeyNameText

MapVirtualKey(KeyCode,

0)

*

65536,

s,

100

s

=

Left(s,

InStr(s,

Chr(0)))

Me.Cls

Print

s

End

Sub

===================================

VB中有预先定义好的键码的常量

你添加这样的定义类型

Dim

k

As

KeyCodeConstants

然后你键入

k

=就可以看到很多常量的选项,就包括所有的虚拟键码

不明白的百度HI我,楼上说的那些方法都不对

===================================

VB.net 怎么制作按键连发功能

用API函数,以下代码Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As LongPrivate Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Private Declare Function SetLayeredWindowAttributes Lib "user32" (ByVal hwnd As Long, ByVal crKey As Long, ByVal bAlpha As Byte, ByVal dwFlags As Long) As LongPrivate Const WS_EX_LAYERED = H80000

Private Const GWL_EXSTYLE = (-20)

Private Const LWA_ALPHA = H2

Private Const LWA_COLORKEY = H1Private Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal X As Long, ByVal Y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long

Private Const HWND_TOPMosT = -1

Private Const SWP_NOMOVE = H2

Private Const SWP_NosIZE = H1

Private Declare Function GetForegroundWindow Lib "user32" () As Long

Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long

Const WM_KEYDOWN = H100

Const WM_KEYUP = H101

Const WM_CHAR = H102

Const VK_F1 = H70

Private Sub SendF1(hwnd) '调用这个过程即可对目标窗体发送F1键

Call PostMessage(hwnd, WM_KEYDOWN, VK_F1, 0)

Call PostMessage(hwnd, WM_KEYUP, VK_F1, 0)

End Sub这里是发送F1的实例,各个按键对应的虚拟键码,要到网上查

关于VB.NET声明符号常量的问题

第三句。在类级别的变量声明语句中必须显式指定类型名称,省略AS语句只可以用在局部变量声明语句中。

Private Const c As String = "ok"

VB中常量如何定义?

常量,是指程序在运行过程中其值可以改变的量;在VB中值常量就是一个固定不变的值,不能修改,变量可以修改内存空间对其进行修改不发生变化的叫常量 。

用Const定义的 在VB中不能参加赋值 比如 Const a as integer=30;隐式声明,只是变量,不经声明,直接使用;显示声明,变量声明后再使用的方式成为显式声明。

扩展资料:

VB变量类型转换规则:

数据型变量之间可以相互赋值。

浮点数转换为整型数时,小数部分“四舍五入”为整数(其中0.5要向最近的偶数靠拢)。

当给一个变量赋予超出它表示范围的值时,会导致“溢出”错误。

例如:

(1)   intN1=45631234   '(超出整型变量范围,系统提示溢出错误)。

(2)   bytN1=-12 '(超出表示范围,报溢出错误)。

参考资料来源:

百度百科-常量


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