VB字符与 UTF8格式互转

叁歲伎倆 2021-09-19 21:50 1538阅读 0赞

**在VB模块文件中加入下面代码：**

Private Declare Function MultiByteToWideChar Lib "kernel32 " (ByVal CodePage As Long, ByVal dwFlags As Long, ByVal lpMultiByteStr As Long, ByVal cchMultiByte As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long) As Long
    Private Declare Function WideCharToMultiByte Lib "kernel32 " (ByVal CodePage As Long, ByVal dwFlags As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long, ByVal lpMultiByteStr As Long, ByVal cchMultiByte As Long, ByVal lpDefaultChar As Long, ByVal lpUsedDefaultChar As Long) As Long
    Private Const CP_ACP = 0 ' default to ANSI code page
    Private Const CP_UTF8 = 65001 ' default to UTF-8 code page
    
    '字符转 UTF8
    Public Function EncodeToBytes(ByVal sData As String) As Byte() ' Note: Len(sData) > 0
    Dim aRetn() As Byte
    Dim nSize As Long
    nSize = WideCharToMultiByte(CP_UTF8, 0, StrPtr(sData), -1, 0, 0, 0, 0) - 1
    If nSize = 0 Then Exit Function
    ReDim aRetn(0 To nSize - 1) As Byte
    WideCharToMultiByte CP_UTF8, 0, StrPtr(sData), -1, VarPtr(aRetn(0)), nSize, 0, 0
    EncodeToBytes = aRetn
    Erase aRetn
    End Function
    
    ' UTF8 转字符
    Public Function DecodeToBytes(ByVal sData As String) As Byte() ' Note: Len(sData) > 0
    Dim aRetn() As Byte
    Dim nSize As Long
    nSize = MultiByteToWideChar(CP_UTF8, 0, StrPtr(sData), -1, 0, 0) - 1
    If nSize = 0 Then Exit Function
    ReDim aRetn(0 To 2 * nSize - 1) As Byte
    MultiByteToWideChar CP_UTF8, 0, StrPtr(sData), -1, VarPtr(aRetn(0)), nSize
    DecodeToBytes = aRetn
    Erase aRetn
    End Function
    Private Sub Command1_Click()
    Dim s As String
    s = StrConv(EncodeToBytes("中文"), vbUnicode) '将utf编码的数组转VB可处理字符
    MsgBox s
    t = DecodeToBytes(StrConv(s, vbFromUnicode))
    MsgBox t
    End Sub
    
    '

**使用方法：**  
1、utf8转VB字符串

Private Sub Utf8ToVBstr_Click()
            Dim vbstr As String
            vbstr  = DecodeToBytes(StrConv(这里填待转换的utf8字符串, vbFromUnicode))
            MsgBox vbstr 
        End Sub

2、VB字符串转utf8

Private Sub VBstrToUtf8_Click()
        Dim utf8str As String
    	utf8str =EncodeToBytes(这里填待转换的VB字符串);
        MsgBox utf8str 
    End Sub