基于VB做的串口编程调试软件

'**********************************

'窗体 main(main.frm)_程序
'**********************************

'**********************************
'字符表示的十六进制数转化为相应的整数
'错误则返回  -1
'**********************************

Function ConvertHexChr(str As String) As Integer
   
    Dim test As Integer
   
    test = Asc(str)
    If test >= Asc("0") And test <= Asc("9") Then
        test = test - Asc("0")
    ElseIf test >= Asc("a") And test <= Asc("f") Then
        test = test - Asc("a") + 10
    ElseIf test >= Asc("A") And test <= Asc("F") Then
        test = test - Asc("A") + 10
    Else
        test = -1                                       '出错信息
    End If
    ConvertHexChr = test
   
End Function

'**********************************
'字符串表示的十六进制数据转化为相应的字节串
'返回转化后的字节数
'**********************************

Function strHexToByteArray(strText As String, bytByte() As Byte) As Integer
   
    Dim HexData As Integer          '十六进制(二进制)数据字节对应值
    Dim hstr As String * 1          '高位字符
    Dim lstr As String * 1          '低位字符
    Dim HighHexData As Integer      '高位数值
    Dim LowHexData As Integer       '低位数值
    Dim HexDataLen As Integer       '字节数
    Dim StringLen As Integer        '字符串长度
    Dim ACCount As Integer          '计数
       
    strTestn = ""                   '设初值
    HexDataLen = 0
    strHexToByteArray = 0
   
    StringLen = Len(strText)
    Account = StringLen \ 2
    ReDim bytByte(Account)
   
    For n = 1 To StringLen
   
        Do                                              '清除空格
            hstr = Mid(strText, n, 1)
            n = n + 1
            If (n - 1) > StringLen Then
                HexDataLen = HexDataLen - 1
               
                Exit For
            End If
        Loop While hstr = " "
       
        Do
            lstr = Mid(strText, n, 1)
            n = n + 1
            If (n - 1) > StringLen Then
                HexDataLen = HexDataLen - 1
               
                Exit For
            End If
        Loop While lstr = " "
        n = n - 1
        If n > StringLen Then
            HexDataLen = HexDataLen - 1
            Exit For
        End If
       
        HighHexData = ConvertHexChr(hstr)
        LowHexData = ConvertHexChr(lstr)
       
        If HighHexData = -1 Or LowHexData = -1 Then     '遇到非法字符中断转化
            HexDataLen = HexDataLen - 1
           
            Exit For
        Else
           
            HexData = HighHexData * 16 + LowHexData
            bytByte(HexDataLen) = HexData
            HexDataLen = HexDataLen + 1
           
           
        End If
                       
    Next n
   
    If HexDataLen > 0 Then                              '修正最后一次循环改变的数值
        HexDataLen = HexDataLen - 1
        ReDim Preserve bytByte(HexDataLen)
    Else
        ReDim Preserve bytByte(0)
    End If
   
   
    If StringLen = 0 Then                               '如果是空串,则不会进入循环体

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本文关键字：软件  自动控制-单片机，电子制作 - 自动控制-单片机