用vb写一个hex转bin程序

以下是使用VB语言编写的Hex转Bin程序：

Private Function HexToBin(ByVal HexString As String) As String
    Dim i As Integer
    Dim BinString As String
    For i = 1 To Len(HexString)
        Select Case Mid(HexString, i, 1)
            Case "0"
                BinString = BinString & "0000"
            Case "1"
                BinString = BinString & "0001"
            Case "2"
                BinString = BinString & "0010"
            Case "3"
                BinString = BinString & "0011"
            Case "4"
                BinString = BinString & "0100"
            Case "5"
                BinString = BinString & "0101"
            Case "6"
                BinString = BinString & "0110"
            Case "7"
                BinString = BinString & "0111"
            Case "8"
                BinString = BinString & "1000"
            Case "9"
                BinString = BinString & "1001"
            Case "A", "a"
                BinString = BinString & "1010"
            Case "B", "b"
                BinString = BinString & "1011"
            Case "C", "c"
                BinString = BinString & "1100"
            Case "D", "d"
                BinString = BinString & "1101"
            Case "E", "e"
                BinString = BinString & "1110"
            Case "F", "f"
                BinString = BinString & "1111"
            Case Else
                ' Invalid hex character
                HexToBin = ""
                Exit Function
        End Select
    Next i
    HexToBin = BinString
End Function

使用方法：

Dim HexString As String
Dim BinString As String
' 输入16进制字符串
HexString = "1ACF"
' 调用函数转换成二进制字符串
BinString = HexToBin(HexString)
' 显示结果
MsgBox "二进制字符串：" & BinString