VB CRC校验问题

大概看了下。有变量定义类型错误，修改如下：

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Public

Function

crc16(ByRef

cmdstring()

As

Byte,

DataLen

As

Integer)

As

String

Dim

data

As

Integer

Dim

i

As

Integer

Dim

CRCHi

As

long,

CRCLo

As

long'这里应该定义为long.因为下面赋值是long型。朋友。

Dim

iIndex

As

Long

Dim

CRCStr

As

String

Dim

DataStr

As

String

CRCLo

=

HFF'看这里的赋值。long型

CRCHi

=

HFF

For

i

=

To

DataLen

iIndex

=

CRCLo

Xor

cmdstring(i)

CRCLo

=

CRCHi

Xor

GetCRCLo(iIndex)

'低位处理

CRCHi

=

GetCRCHi(iIndex)

'高位处理

DataStr

=

DataStr

Chr(cmdstring(i))

Next

i

Dim

ReturnData(1)

As

Byte

ReturnData(1)

=

CRCHi

ReturnData(0)

=

CRCLo

CRCStr

=

StrConv(ReturnData,

vbUnicode)

crc16

=

DataStr

+

CRCStr

End

Function

VB CRC校验码计算

Private Function CRC16(data() As Byte) As String

Dim CRC16Lo As Byte, CRC16Hi As Byte 'CRC寄存器

Dim CL As Byte, CH As Byte '多项式码HA001

Dim CRCLo As String, CRCHi As String

Dim SaveHi As Byte, SaveLo As Byte

Dim i As Integer

Dim Flag As Integer

CRC16Lo = HFF

CRC16Hi = HFF

CL = H1

CH = HA0

For i = 0 To UBound(data)

CRC16Lo = CRC16Lo Xor data(i) '每一个数据与CRC寄存器进行异或

For Flag = 0 To 7

SaveHi = CRC16Hi

SaveLo = CRC16Lo

CRC16Hi = CRC16Hi \ 2 '高位右移一位

CRC16Lo = CRC16Lo \ 2 '低位右移一位

If ((SaveHi And H1) = H1) Then '如果高位字节最后一位为1

CRC16Lo = CRC16Lo Or H80 '否则低位字节右移后前面补1

End If '否则自动补0

If ((SaveLo And H1) = H1) Then '如果LSB为1，则与多项式码进行异或

CRC16Hi = CRC16Hi Xor CH

CRC16Lo = CRC16Lo Xor CL

End If

Next Flag

Next i

If Len(Hex(CRC16Hi)) = 1 Then

CRCHi = "0" + Hex(CRC16Hi)

Else

CRCHi = Hex(CRC16Hi)

End If

If Len(Hex(CRC16Lo)) = 1 Then

CRCLo = "0" + Hex(CRC16Lo)

Else

CRCLo = Hex(CRC16Lo)

End If

CRC16 = CRCLo + CRCHi

End Function

请大侠帮我将C代码转换成VB.Net，谢谢！

public function Calculate_CRC8(byval crc as uint16,byval n as uint16) as uint16

dim i as uint16

crc=crc xor n

for i=0 to 7

if crc and 1 then

crc=(crc1) xor H8c

else

crc=crc1

end if

next

return crc

end function

vb如何实现CRC12校验

Private Sub Form_Load()

'text1为校验对象

Text1.Text = "31303432"

'text2为校验多项式

Text2.Text = "180D"

End Sub

Private Sub Command1_Click()

Text3.Text = CRC(Text1.Text, Text2.Text, 12)

End Sub

Private Function CRC(ByVal Hex_Number As String, ByVal Hex_CRC As String, Optional ByVal C As Integer = 16) As String

'Hex_Number为校验项16进制数字，Hex_CRC为校验多项式，16进制，C为默认位数CRC-16

Dim i As Integer

Dim BinNumber As String

Dim BinCRC As String

Dim Temp As String

CRC = "0"

If Hex_Number = "0" Then Exit Function

BinNumber = HEXtoBin(Hex_Number)

BinCRC = HEXtoBin(Hex_CRC)

i = Len(BinCRC)

BinNumber = BinNumber String(C, "0")

CRC = Left(BinNumber, i)

Temp = Right(BinNumber, Len(BinNumber) - i)

Temp = HEXtoBin(Hex(CLng("H" BINtoHEX(CRC)) Xor CLng("H" Hex_CRC))) Temp

CRC = BINtoHEX(Temp)

If Len(Temp) = i Then

CRC = CRC(CRC, Hex_CRC, 0)

End If

End Function

Private Function HEXtoBin(Hex_Number) As String

'十六进制转换为二进制

Dim i As Long

Dim B As String

Hex_Number = UCase(Hex_Number)

For i = 1 To Len(Hex_Number)

Select Case Mid(Hex_Number, i, 1)

Case "0": B = B "0000"

Case "1": B = B "0001"

Case "2": B = B "0010"

Case "3": B = B "0011"

Case "4": B = B "0100"

Case "5": B = B "0101"

Case "6": B = B "0110"

Case "7": B = B "0111"

Case "8": B = B "1000"

Case "9": B = B "1001"

Case "A": B = B "1010"

Case "B": B = B "1011"

Case "C": B = B "1100"

Case "D": B = B "1101"

Case "E": B = B "1110"

Case "F": B = B "1111"

End Select

Next i

While Left(B, 1) = "0"

B = Right(B, Len(B) - 1)

Wend

HEXtoBin = B

End Function

Private Function BINtoHEX(ByVal Bin_Number As String) As String

'二进制转换为十六进制

Dim i As Long

Dim H As String

If Len(Bin_Number) Mod 4 0 Then

Bin_Number = String(4 - Len(Bin_Number) Mod 4, "0") Bin_Number

End If

For i = 1 To Len(Bin_Number) Step 4

Select Case Mid(Bin_Number, i, 4)

Case "0000": H = H "0"

Case "0001": H = H "1"

Case "0010": H = H "2"

Case "0011": H = H "3"

Case "0100": H = H "4"

Case "0101": H = H "5"

Case "0110": H = H "6"

Case "0111": H = H "7"

Case "1000": H = H "8"

Case "1001": H = H "9"

Case "1010": H = H "A"

Case "1011": H = H "B"

Case "1100": H = H "C"

Case "1101": H = H "D"

Case "1110": H = H "E"

Case "1111": H = H "F"

End Select

Next i

While Left(H, 1) = "0"

H = Right(H, Len(H) - 1)

Wend

BINtoHEX = H

End Function

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