vb 位操作代码,VB.Net代码库,德仔网

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【VB.Net】 vb 位操作
作者:Dezai.CN / 发布于2013/6/18/ 1024

	'功能： 将字节变量循环左移n位
	'入口参数：MoveByte 需要移位的字节变量
	' n 移动的位数
	'返回值： 移位后的字节变量
	Public Function ByteLeftMove(MoveByte As Byte, N As Integer) As Byte
	Dim Intem As Byte '临时变量
	Dim Intem1 As Byte '临时变量
	Dim x As Integer, y As Integer
	 Intem1 = MoveByte
	 For x = 1 To N '移多少位就循环多少次
	 For y = 8 To 1 Step -1 '从第八位(左边第一位)开始循环左移
	 Select Case y
	 Case 8
	 '如果临时变量intem1的第八位是1,
	 If (Intem1 And &H80) = &H80 Then
	 '则将临时变量intem置1,
	 Intem = &H1
	 Else
	 Intem = &H0 '反之置0
	 End If
	 Case 7
	 '如果临时变量intem1的第七位是1,
	 If (Intem1 And &H40) = &H40 Then
	 '则将其第八位置1(其它位不变),
	 Intem1 = Intem1 Or &H80
	 Else
	 '反之将第八位置0(其它位不变)
	 Intem1 = Intem1 And &H7F
	 End If
	 Case 6
	 '操作与上面相同
	 If (Intem1 And &H20) = &H20 Then
	 Intem1 = Intem1 Or &H40
	 Else
	 Intem1 = Intem1 And &HBF
	 End If
	 Case 5
	 If (Intem1 And &H10) = &H10 Then
	 Intem1 = Intem1 Or &H20
	 Else
	 Intem1 = Intem1 And &HDF
	 End If
	 Case 4
	 If (Intem1 And &H8) = &H8 Then
	 Intem1 = Intem1 Or &H10
	 Else
	 Intem1 = Intem1 And &HEF
	 End If
	 Case 3
	 If (Intem1 And &H4) = &H4 Then
	 Intem1 = Intem1 Or &H8
	 Else
	 Intem1 = Intem1 And &HF7
	 End If
	 Case 2
	 If (Intem1 And &H2) = &H2 Then
	 Intem1 = Intem1 Or &H4
	 Else
	 Intem1 = Intem1 And &HFB
	 End If
	 Case 1
	 If (Intem1 And &H1) = &H1 Then
	 Intem1 = Intem1 Or &H2
	 Else
	 Intem1 = Intem1 And &HFD
	 End If
	 If Intem = &H1 Then '移完第一位后,如果intem是1(即第八位是1)
	 Intem1 = Intem1 Or &H1 '则将intem1的第一位置1
	 Else
	 Intem1 = Intem1 And &HFE '反之置0
	 End If
	 End Select
	 Next y
	 Next x
	 ByteLeftMove = Intem1 '将intem1的值返回给函数名
	End Function



	'功能： 将字节变量循环右移n位
	'入口参数：MoveByte 需要移位的字节变量
	' n 移动的位数
	'返回值： 移位后的字节变量
	Public Function ByteRightMOve(MoveByte As Byte, N As Integer) As Byte
	Dim Intem As Byte '临时变量
	Dim Intem1 As Byte '临时变量
	Dim x As Integer, y As Integer
	 Intem1 = MoveByte
	 For x = 1 To N '移多少位就循环多少次
	 For y = 1 To 8 Step 1 '从第一位(右边第一位)开始循环右移
	 Select Case y
	 Case 1
	 '如果临时变量intem1的第一位是1,
	 If (Intem1 And &H1) = &H1 Then
	 '则将临时变量intem置1,
	 Intem = &H1
	 Else
	 Intem = &H0 '反之置0
	 End If
	 Case 2
	 '如果临时变量intem1的第二位是1,
	 If (Intem1 And &H2) = &H2 Then
	 '则将其第一位置1(其它位不变),
	 Intem1 = Intem1 Or &H1
	 Else
	 '反之将第一位置0(其它位不变)
	 Intem1 = Intem1 And &HFE
	 End If
	 Case 3
	 '操作与上面相同
	 If (Intem1 And &H4) = &H4 Then
	 Intem1 = Intem1 Or &H2
	 Else
	 Intem1 = Intem1 And &HFD
	 End If
	 Case 4
	 If (Intem1 And &H8) = &H8 Then
	 Intem1 = Intem1 Or &H4
	 Else
	 Intem1 = Intem1 And &HFB
	 End If
	 Case 5
	 If (Intem1 And &H10) = &H10 Then
	 Intem1 = Intem1 Or &H8
	 Else
	 Intem1 = Intem1 And &HF7
	 End If
	 Case 6
	 If (Intem1 And &H20) = &H20 Then
	 Intem1 = Intem1 Or &H10
	 Else
	 Intem1 = Intem1 And &HEF
	 End If
	 Case 7
	 If (Intem1 And &H40) = &H40 Then
	 Intem1 = Intem1 Or &H20
	 Else
	 Intem1 = Intem1 And &HDF
	 End If
	 Case 8
	 If (Intem1 And &H80) = &H80 Then
	 Intem1 = Intem1 Or &H40
	 Else
	 Intem1 = Intem1 And &HBF
	 End If
	 If Intem = &H1 Then '移完第八位后,如果intem是1(即第一位是1)
	 Intem1 = Intem1 Or &H80 '则将intem1的第八位置1
	 Else
	 Intem1 = Intem1 And &H7F '反之置0
	 End If
	 End Select
	 Next y
	 Next x
	 ByteRightMOve = Intem1 '将intem1的值返回给函数名
	End Function

	'功能： 将字节数据的某一位置 1 或置 0
	'入口参数： ByteData 数据
	' BitNumber 位号
	' BitHandleType 位操作类型 0 置0 ， 1 置1
	'返回值： 处理后的字节数据
	Public Function BitHandle(ByVal BitHandleType As Long, ByVal ByteData As Byte, ByVal BitNumber As Long) As Byte
	 Select Case BitHandleType
	 '置0
	 Case 0
	 Select Case BitNumber
	 '1位
	 Case 1
	 BitHandle = ByteData And &HFE
	 '2位
	 Case 2
	 BitHandle = ByteData And &HFD
	 '3位
	 Case 3
	 BitHandle = ByteData And &HFB
	 '4位
	 Case 4
	 BitHandle = ByteData And &HF7
	 '5位
	 Case 5
	 BitHandle = ByteData And &HEF
	 '6位
	 Case 6
	 BitHandle = ByteData And &HDF
	 '7位
	 Case 7
	 BitHandle = ByteData And &HBF
	 '8位
	 Case 8
	 BitHandle = ByteData And &H7F
	 End Select
	
	 '置1
	 Case 1
	 Select Case BitNumber
	 '1位
	 Case 1
	 BitHandle = ByteData Or &H1
	 '2位
	 Case 2
	 BitHandle = ByteData Or &H2
	 '3位
	 Case 3
	 BitHandle = ByteData Or &H4
	 '4位
	 Case 4
	 BitHandle = ByteData Or &H8
	 '5位
	 Case 5
	 BitHandle = ByteData Or &H10
	 '6位
	 Case 6
	 BitHandle = ByteData Or &H20
	 '7位
	 Case 7
	 BitHandle = ByteData Or &H40
	 '8位
	 Case 8
	 BitHandle = ByteData Or &H80
	 End Select
	 End Select
	End Function
	
	'功能： 判断字节数据的某一位是 0 还是 1
	'入口参数： ByteData 数据
	' BitNumber位号
	'返回值： 检测位的数据
	Public Function CheckBit(ByVal ByteData As Byte, BitNumber As Long) As Byte
	 Select Case BitNumber
	 '1位
	 Case 1
	 If (ByteData And &H1) = &H1 Then
	 CheckBit = 1
	 Else
	 CheckBit = 0
	 End If
	 '2位
	 Case 2
	 If (ByteData And &H2) = &H2 Then
	 CheckBit = 1
	 Else
	 CheckBit = 0
	 End If
	
	 '3位
	 Case 3
	 If (ByteData And &H4) = &H4 Then
	 CheckBit = 1
	 Else
	 CheckBit = 0
	 End If
	
	 '4位
	 Case 4
	 If (ByteData And &H8) = &H8 Then
	 CheckBit = 1
	 Else
	 CheckBit = 0
	 End If
	
	 '5位
	 Case 5
	 If (ByteData And &H10) = &H10 Then
	 CheckBit = 1
	 Else
	 CheckBit = 0
	 End If
	
	 '6位
	 Case 6
	 If (ByteData And &H20) = &H20 Then
	 CheckBit = 1
	 Else
	 CheckBit = 0
	 End If
	
	 '7位
	 Case 7
	 If (ByteData And &H40) = &H40 Then
	 CheckBit = 1
	 Else
	 CheckBit = 0
	 End If
	
	 '8位
	 Case 8
	 If (ByteData And &H80) = &H80 Then
	 CheckBit = 1
	 Else
	 CheckBit = 0
	 End If
	
	 End Select
	End Function
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