VB UTF-8编码与解码

Option ExplicitPrivate Declare Function WideCharToMultiByte Lib "kernel32" (ByVal CodePage As Long, ByVal dwFlags As Long, ByVal lpWideCharStr As Long, ByVal cchWideChar As Long, ByRef lpMultiByteStr As Any, ByVal cchMultiByte As Long, ByVal lpDefaultChar As String, ByVal lpUsedDefaultChar As Long) As LongPrivate 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 LongPrivate Const CP_UTF8 = 65001Private Declare Sub MoveMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)Public Function UTF8_Encode(ByVal strUnicode As String) As Byte()'UTF-8 编码 Dim TLen As Long Dim lngBufferSize As Long Dim lngResult As Long Dim bytUtf8() As Byte TLen = Len(strUnicode) If TLen = 0 Then Exit Function lngBufferSize = TLen * 3 + 1 ReDim bytUtf8(lngBufferSize - 1) lngResult = WideCharToMultiByte(CP_UTF8, 0, StrPtr(strUnicode), TLen, bytUtf8(0), lngBufferSize, vbNullString, 0) If lngResult <> 0 Then lngResult = lngResult - 1 ReDim Preserve bytUtf8(lngResult) End If UTF8_Encode = bytUtf8End FunctionPublic Function UTF8_Decode(ByRef bUTF8() As Byte) As String'UTF-8 解码 Dim lRet As Long Dim lLen As Long Dim lBufferSize As Long Dim sBuffer As String Dim bBuffer() As Byte lLen = UBound(bUTF8) + 1 If lLen = 0 Then Exit Function lBufferSize = lLen * 2 sBuffer = String$(lBufferSize, Chr(0)) lRet = MultiByteToWideChar(CP_UTF8, 0, VarPtr(bUTF8(0)), lLen, StrPtr(sBuffer), lBufferSize) If lRet <> 0 Then sBuffer = Left(sBuffer, lRet) End If UTF8_Decode = sBufferEnd FunctionPublic Function CreateStringFromByte(ByRef byteArray() As Byte, ByVal ByteLength As Long) As String'字节数组中的数据连接成字符串 Dim StringData As String '** 分配字符串空间 StringData = Space(ByteLength) '** 复制字符数组地址内容到字符串地址 MoveMemory ByVal StringData, ByVal VarPtr(byteArray(0)), ByteLength '** 返回字符串 CreateStringFromByte = StringDataEnd FunctionPublic Function SaveStringToByteArry(ByRef strString As String) As Byte()'把字符串存入字节数组 Dim BytArray() As Byte, lngStrLen As Long '** 获取字符串的长度(字节) lngStrLen = LenB(StrConv(strString, vbFromUnicode)) '** 分配数组空间 ReDim BytArray(lngStrLen - 1) '** 将字符串地址中的内容拷贝到数组 MoveMemory ByVal VarPtr(BytArray(0)), ByVal strString, lngStrLen SaveStringToByteArry = BytArrayEnd Function