vb.net获取字典键值 c#获取字典中指定键所对应的值
vb.net怎样读取并更改指定注册表目录下的REG_SZ键值
VB.NET 参考代码：
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Imports Microsoft.Win32
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim regKey As RegistryKey = Registry.LocalMachine.OpenSubKey("SYSTEM\CurrentControlSet\Control\Windows", False)
For Each strSubKeyName In regKey.GetValueNames()
If regKey.GetValueKind(strSubKeyName) = RegistryValueKind.String Then
MessageBox.Show(regKey.GetValue(strSubKeyName))
' regKey.SetValue(strSubKeyName, "修改后的值")
End If
Next
End Sub
End Class
vb中如何获得键盘方向键的键值
将窗体KeyPreview属性设置为True并对Form_KeyDown事件编程，可以获取键盘箭头键的键值。实现方法如下：
Option Explicit
Private Sub Form_Load()
'允许窗体拦截键盘按键
Me.KeyPreview = True
End Sub
Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
' KeyCode 键盘码是键盘上每个按键的唯一编码
' 在VB中，符号常数表示键盘码，例如 vbKeyF1 表示F1键,
' vbKeyHome 表示HOME键……
Select Case KeyCode
Case vbKeyLeft: Print "左箭头键值：" + CStr(KeyCode)
Case vbKeyRight: Print "右箭头键值：" + CStr(KeyCode)
Case vbKeyUp: Print "上箭头键值：" + CStr(KeyCode)
Case vbKeyDown: Print "下箭头键值：" + CStr(KeyCode)
End Select
End Sub
VB.net 中如何获取键盘输入的ASCii码
Private Sub Form1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
If Asc(0) Then
textbox1.text="0"
end if
end sub
vb获取注册表键值模块？
从一个VB编写的注册表程序中整理出来的，功能是获取注册表指定键值，内含注释，模块可用于注册表的操作中：
01
Function GetRegistryValue(ByVal hKey As RootKeyEnum, ByVal KeyName As String, _
02
ByVal ValueName As String, Optional DefaultValue As Variant) As Variant
03
Dim handle As Long
04
Dim resLong As Long
05
Dim resString As String
06
Dim resBinary() As Byte
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Dim length As Long
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Dim retVal As Long
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Dim valueType As Long
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Const KEY_READ = H20019
11
'// 默认结果
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GetRegistryValue = IIf(IsMissing(DefaultValue), Empty, DefaultValue)
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'// 打开键, 不存在则退出
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If RegOpenKeyEx(hKey, KeyName, 0, KEY_READ, handle) Then Exit Function
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'// 准备 1K resBinary 用于接收
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length = 1024
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ReDim resBinary(0 To length - 1) As Byte
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'// 读注册表值
19
retVal = RegQueryValueEx(handle, ValueName, 0, valueType, resBinary(0), length)
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'// 若resBinary 太小则重读
21
If retVal = ERROR_MORE_DATA Then
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'// resBinary放大,且重新读取
23
ReDim resBinary(0 To length - 1) As Byte
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retVal = RegQueryValueEx(handle, ValueName, 0, valueType, resBinary(0), _
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length)
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End If
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'// 返回相应值类型
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Select Case valueType
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Case REG_DWORD, REG_DWORD_LITTLE_ENDIAN
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'// REG_DWORD 和 REG_DWORD_LITTLE_ENDIAN 相同
31
CopyMemory resLong, resBinary(0), 4
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GetRegistryValue = resLong
33
Case REG_DWORD_BIG_ENDIAN
34
'// Big Endian's 用在非-Windows环境, 如Unix系统, 本地计算机远程访问
35
CopyMemory resLong, resBinary(0), 4
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GetRegistryValue = SwapEndian(resLong)
37
Case REG_SZ, REG_EXPAND_SZ
38
resString = Space$(length - 1)
39
CopyMemory ByVal resString, resBinary(0), length - 1
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If valueType = REG_EXPAND_SZ Then
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'// 查询对应的环境变量
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GetRegistryValue = ExpandEnvStr(resString)
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Else
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GetRegistryValue = resString
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End If
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Case REG_MULTI_SZ
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'// 复制时需指定2个空格符
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resString = Space$(length - 2)
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CopyMemory ByVal resString, resBinary(0), length - 2
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GetRegistryValue = resString
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Case Else ' 包含 REG_BINARY
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'// resBinary 调整
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If length UBound(resBinary) + 1 Then
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ReDim Preserve resBinary(0 To length - 1) As Byte
55
End If
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GetRegistryValue = resBinary()
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End Select
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'// 关闭注册表
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