VB 各种进制相互转换大全

            Case "E": B = B + 16 ^ (i - 1) * 14
            Case "F": B = B + 16 ^ (i - 1) * 15
        End Select
    Next i
    HEX_to_DEC = B
End Function
' 用途：将十进制转化为十六进制
' 输入：Dec(十进制数)
' 输入数据类型：Long
' 输出：DEC_to_HEX(十六进制数)
' 输出数据类型：String
' 输入的最大数为2147483647,输出最大数为7FFFFFFF
Public Function DEC_to_HEX(Dec As Long) As String
    Dim a As String
    DEC_to_HEX = ""
    Do While Dec > 0
        a = CStr(Dec Mod 16)
        Select Case a
            Case "10": a = "A"
            Case "11": a = "B"
            Case "12": a = "C"
            Case "13": a = "D"
            Case "14": a = "E"
            Case "15": a = "F"
        End Select
        DEC_to_HEX = a & DEC_to_HEX
        Dec = Dec \ 16
    Loop
End Function

' 用途：将十进制转化为八进制
' 输入：Dec(十进制数)
' 输入数据类型：Long
' 输出：DEC_to_OCT(八进制数)
' 输出数据类型：String
' 输入的最大数为2147483647,输出最大数为17777777777
Public Function DEC_to_OCT(Dec As Long) As String
    DEC_to_OCT = ""
    Do While Dec > 0
        DEC_to_OCT = Dec Mod 8 & DEC_to_OCT
        Dec = Dec \ 8
    Loop
End Function

' 用途：将八进制转化为十进制
' 输入：Oct(八进制数)
' 输入数据类型：String
' 输出：OCT_to_DEC(十进制数)
' 输出数据类型：Long
' 输入的最大数为17777777777,输出的最大数为2147483647
Public Function OCT_to_DEC(ByVal Oct As String) As Long
    Dim i As Long
    Dim B As Long
   
    For i = 1 To Len(Oct)
        Select Case Mid(Oct, Len(Oct) - i + 1, 1)
            Case "0": B = B + 8 ^ (i - 1) * 0
            Case "1": B = B + 8 ^ (i - 1) * 1
            Case "2": B = B + 8 ^ (i - 1) * 2
            Case "3": B = B + 8 ^ (i - 1) * 3
            Case "4": B = B + 8 ^ (i - 1) * 4
            Case "5": B = B + 8 ^ (i - 1) * 5
            Case "6": B = B + 8 ^ (i - 1) * 6
            Case "7": B = B + 8 ^ (i - 1) * 7
        End Select
    Next i
    OCT_to_DEC = B
End Function

' 用途：将二进制转化为八进制
' 输入：Bin(二进制数)
' 输入数据类型：String
' 输出：BIN_to_OCT(八进制数)
' 输出数据类型：String
' 输入的最大数为2147483647个字符
Public Function BIN_to_OCT(ByVal Bin As String) As String
    Dim i As Long
    Dim H As String
    If Len(Bin) Mod 3 <> 0 Then
        Bin = String(3 - Len(Bin) Mod 3, "0") & Bin
    End If
   
    For i = 1 To Len(Bin) Step 3
        Select Case Mid(Bin, i, 3)
            Case "000": H = H & "0"
            Case "001": H = H & "1"
            Case "010": H = H & "2"
            Case "011": H = H & "3"
            Case "100": H = H & "4"
            Case "101": H = H & "5"
            Case "110": H = H & "6"
            Case "111": H = H & "7"
        End Select
    Next i
    While Left(H, 1) = "0"
        H = Right(H, Len(H) - 1)
    Wend
    BIN_to_OCT = H
End Function

' 用途：将八进制转化为二进制
' 输入：Oct(八进制数)
' 输入数据类型：String
' 输出：OCT_to_BIN(二进制数)
' 输出数据类型：String
' 输入的最大数为2147483647个字符
Public Function OCT_to_BIN(ByVal Oct As String) As String
    Dim i As Long
    Dim B As String
   
    For i = 1 To Len(Oct)
        Select Case Mid(Oct, i, 1)
            Case "0": B = B & "000"
            Case "1": B = B & "001"
            Case "2": B = B & "010"
            Case "3": B = B & "011"
            Case "4": B = B & "100"
            Case "5": B = B & "101"
            Case "6": B = B & "110"
            Case "7": B = B & "111"
        End Select
    Next i
    While Left(B, 1) = "0"
        B = Right(B, Len(B) - 1)
    Wend
    OCT_to_BIN = B
End Function

' 用途：将八进制转化为十六进制
' 输入：Oct(八进制数)
' 输入数据类型：String
' 输出：OCT_to_HEX(十六进制数)
' 输出数据类型：String
' 输入的最大数为2147483647个字符
Public Function OCT_to_HEX(ByVal Oct As String) As String
    Dim Bin As String
    Bin = OCT_to_BIN(Oct)
    OCT_to_HEX = BIN_to_HEX(Bin)
End Function

' 用途：将十六进制转化为八进制
' 输入：Hex(十六进制数)
' 输入数据类型：String
' 输出：HEX_to_OCT(八进制数)
' 输出数据类型：String
' 输入的最大数为2147483647个字符
Public Function HEX_to_OCT(ByVal Hex As String) As String
    Dim Bin As String
    Hex = UCase(Hex)
    Bin = HEX_to_BIN(Hex)
    HEX_to_OCT = BIN_to_OCT(Bin)
End Function

VB自带函数：
十进制转八进制：Oct(num)
十六进制转八进制：oct("&H" & num)
十进制转十六进制：hex(num)
八进制转十六进制：hex("&O" & num)

十六进制转换为十进制
    Dim str As String                    
    str = Text2.Text
    Text10.Text = CLng("&H" & str) 

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