Ansi,Unicode(little endian),Unicode big endian,UTF-8编码文件相互转换

Option Explicit
Private Declare Function MultiByteToWideChar Lib "kernel32.dll" (ByVal CodePage As Long, ByVal dwFlags As Long, ByVal lpMultiByteStr As String, ByVal cchMultiByte As Long, ByVal lpWideCharStr As String, ByVal cchWideChar As Long) As Long
Private Declare Function WideCharToMultiByte Lib "kernel32.dll" (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 Long
Private Const CP_ACP As Long = 0
Private Const CP_UTF8 As Long = 65001

'Ansi纯文本文件转换为Unicode(Little Endian)文本文件
Private Function AnsiToULE(ByVal Inputansifile As String, ByVal OutputULEfile As String) As Boolean
Dim Filebyte() As Byte, sAnsi As String, retLen As Long, FileNumber As Long
Dim sUnicodeBuffer As String

On Error Resume Next

'打开Ansi纯文本文件Inputansifile
FileNumber = FreeFile
If Dir(Inputansifile) = "" Then AnsiToULE = False: Exit Function
Open Inputansifile For Binary As #FileNumber
ReDim Filebyte(LOF(FileNumber) - 1)
Get #FileNumber, , Filebyte
Close #FileNumber

sAnsi = StrConv(Filebyte, vbUnicode) '转换为VB6可显示的字符串
retLen = MultiByteToWideChar(CP_ACP, 0, sAnsi, LenB(sAnsi), vbNullChar, 0) '取得转换后需要的空间大小retLen
sUnicodeBuffer = String$(LenB(sAnsi), vbNullChar)  '设置缓冲区大小
If retLen > 0 Then
retLen = MultiByteToWideChar(CP_ACP, 0, sAnsi, LenB(sAnsi), sUnicodeBuffer, retLen) '开始转换
Else
AnsiToULE = False: Exit Function
End If

'保存为Unicode(Little Endian)文本文件OutputULEfile
If retLen > 0 Then
FileNumber = FreeFile
If Dir(OutputULEfile) <> "" Then Kill (OutputULEfile)
Open OutputULEfile For Binary As #FileNumber
Put #FileNumber, , &HFEFF '加上Unicode(Little Endian)文件头BOM标志FFFE
Put #FileNumber, , sUnicodeBuffer '保存文件内容
Close #FileNumber
AnsiToULE = True
Else
AnsiToULE = False: Exit Function
End If
End Function

'Ansi纯文本文件转换为Unicode Big Endian文本文件
Private Function AnsiToUBE(ByVal Inputansifile As String, ByVal OutputUBEfile As String) As Boolean
Dim Filebyte() As Byte, Fbyte() As Byte
Dim sAnsi As String, retLen As Long, FileNumber As Long
Dim sUnicodeBuffer As String
Dim i As Long

On Error Resume Next

'打开Ansi纯文本文件Inputansifile
FileNumber = FreeFile
If Dir(Inputansifile) = "" Then AnsiToUBE = False: Exit Function
Open Inputansifile For Binary As #FileNumber
ReDim Filebyte(LOF(FileNumber) - 1)
Get #FileNumber, , Filebyte
Close #FileNumber

sAnsi = StrConv(Filebyte, vbUnicode) '转换为VB6可显示的字符串
retLen = MultiByteToWideChar(CP_ACP, 0, sAnsi, LenB(sAnsi), vbNullChar, 0) '取得转换后需要的空间大小retLen
sUnicodeBuffer = String$(LenB(sAnsi), vbNullChar)  '设置缓冲区大小
If retLen > 0 Then
retLen = MultiByteToWideChar(CP_ACP, 0, sAnsi, LenB(sAnsi), sUnicodeBuffer, retLen) '开始转换
Else
AnsiToUBE = False: Exit Function
End If

'保存为Unicode Big Endian文本文件OutputUBEfile
If retLen > 0 Then
ReDim Filebyte(LenB(sAnsi) - 1), Fbyte(LenB(sAnsi) - 1)
Filebyte = StrConv(sUnicodeBuffer, vbFromUnicode)
For i = 0 To UBound(Filebyte)
If i Mod 2 = 0 Then
Fbyte(i) = Filebyte(i + 1)
Else
Fbyte(i) = Filebyte(i - 1)
End If
Next
FileNumber = FreeFile
If Dir(OutputUBEfile) <> "" Then Kill (OutputUBEfile)
Open OutputUBEfile For Binary As #FileNumber
Put #FileNumber, , &HFFFE '加上Unicode(Big Endian)文件头BOM标志FEFF
Put #FileNumber, , Fbyte ' sUnicodeBuffer   '保存文件内容
Close #FileNumber
AnsiToUBE = True
Else
AnsiToUBE = False: Exit Function
End If
End Function

'Ansi纯文本文件转换为UTF-8文本文件
Private Function AnsiToUTF8(ByVal Inputansifile As String, ByVal OutputUTF8file As String) As Boolean
Dim Filebyte() As Byte ', Fbyte() As Byte
Dim sAnsi As String, retLen As Long, FileNumber As Long
Dim sUTF8Buffer() As Byte, S As String

On Error Resume Next

'打开Ansi纯文本文件Inputansifile
FileNumber = FreeFile
If Dir(Inputansifile) = "" Then AnsiToUTF8 = False: Exit Function
Open Inputansifile For Binary As #FileNumber
ReDim Filebyte(LOF(FileNumber) - 1)
Get #FileNumber, , Filebyte
Close #FileNumber

S = Filebyte
sAnsi = StrConv(S, vbUnicode)  '转换为VB6可显示的字符串
retLen = WideCharToMultiByte(CP_UTF8, 0, StrPtr(sAnsi), -1, vbNullString, 0, vbNullString, 0) '取得转换后需要的空间大小retLen

If retLen > 0 Then
ReDim sUTF8Buffer(retLen - 1) ' = String$(retLen, vbNullChar) '设置缓冲区大小
retLen = WideCharToMultiByte(CP_UTF8, 0, StrPtr(sAnsi), -1, sUTF8Buffer(0), retLen, vbNullString, 0) '开始转换
Else
AnsiToUTF8 = False: Exit Function
End If

'保存为UTF-8文本文件OutputUTF8file
If retLen > 0 Then
ReDim Preserve sUTF8Buffer(retLen - 1)
S = StrConv(sUTF8Buffer, vbUnicode)
FileNumber = FreeFile
If Dir(OutputUTF8file) <> "" Then Kill (OutputUTF8file)
Open OutputUTF8file For Binary As #FileNumber
Put #FileNumber, , &HBFBBEF '加上UTF-8文件头BOM标志EFBBBF
Put #FileNumber, 4, S '保存文件内容
Close #FileNumber
AnsiToUTF8 = True
Else
AnsiToUTF8 = False: Exit Function
End If
End Function

'UTF-8文本文件转换为Unicode(Little Endian)文本文件
Private Function UTF8ToULE(ByVal InputUTF8file As String, ByVal OutputULEfile As String) As Boolean
Dim Filebyte() As Byte ', Fbyte() As Byte
Dim sAnsi As String, retLen As Long, FileNumber As Long
Dim sUTF8Buffer As String, S As String

On Error Resume Next

'打开UTF-8文本文件InputUTF8file
FileNumber = FreeFile
If Dir(InputUTF8file) = "" Then UTF8ToULE = False: Exit Function
Open InputUTF8file For Binary As #FileNumber
ReDim Filebyte(LOF(FileNumber) - 1)
Get #FileNumber, , Filebyte
Close #FileNumber

If Hex$(Filebyte(0)) = "EF" And Hex$(Filebyte(1)) = "BB" And Hex$(Filebyte(2)) = "BF" Then
S = Filebyte
Else
MsgBox (InputUTF8file & " 为非UTF-8编码格式文件!")
UTF8ToULE = False: Exit Function
End If
sAnsi = StrConv(S, vbUnicode) '转换为VB6可显示的字符串
retLen = MultiByteToWideChar(CP_UTF8, 0, sAnsi, -1, vbNullChar, 0) '取得转换后需要的空间大小retLen

If retLen > 0 Then
sUTF8Buffer = String$(retLen * 2, vbNullChar)  '设置缓冲区大小
retLen = MultiByteToWideChar(CP_UTF8, 0, sAnsi, -1, sUTF8Buffer, retLen * 2)  '开始转换
Else
UTF8ToULE = False: Exit Function
End If

'保存为Unicode(Little Endian)文本文件OutputULEfile
If retLen > 0 Then
S = Left$(sUTF8Buffer, retLen * 2)
FileNumber = FreeFile
If Dir(OutputULEfile) <> "" Then Kill (OutputULEfile)
Open OutputULEfile For Binary As #FileNumber
Put #FileNumber, , S '保存文件内容，程序自动加上了Unicode(Little Endian)文件头BOM标志FFFE
Close #FileNumber
UTF8ToULE = True
Else
UTF8ToULE = False: Exit Function
End If
End Function

'UTF-8文本文件转换为Unicode(Big Endian)文本文件
Private Function UTF8ToUBE(ByVal InputUTF8file As String, ByVal OutputUBEfile As String) As Boolean
Dim Filebyte() As Byte, Fbyte() As Byte
Dim sAnsi As String, retLen As Long, FileNumber As Long
Dim sUTF8Buffer As String, S As String
Dim i As Long

On Error Resume Next

'打开UTF-8文本文件InputUTF8file
FileNumber = FreeFile
If Dir(InputUTF8file) = "" Then UTF8ToUBE = False: Exit Function
Open InputUTF8file For Binary As #FileNumber
ReDim Filebyte(LOF(FileNumber) - 1)
Get #FileNumber, , Filebyte
Close #FileNumber

If Hex$(Filebyte(0)) = "EF" And Hex$(Filebyte(1)) = "BB" And Hex$(Filebyte(2)) = "BF" Then
S = Filebyte
Else
MsgBox (InputUTF8file & " 为非UTF-8编码格式文件!")
UTF8ToUBE = False: Exit Function
End If
sAnsi = StrConv(S, vbUnicode) '转换为VB6可显示的字符串
retLen = MultiByteToWideChar(CP_UTF8, 0, sAnsi, -1, vbNullString, 0) '取得转换后需要的空间大小retLen

If retLen > 0 Then
sUTF8Buffer = String$(retLen * 2, vbNullChar)  '设置缓冲区大小
retLen = MultiByteToWideChar(CP_UTF8, 0, sAnsi, -1, sUTF8Buffer, retLen * 2)  '开始转换
Else
UTF8ToUBE = False: Exit Function
End If

'保存为Unicode Big Endian文本文件OutputUBEfile
If retLen > 0 Then
ReDim Filebyte(LenB(sAnsi) - 1), Fbyte(LenB(sAnsi) - 1)
Filebyte = StrConv(Left$(sUTF8Buffer, retLen * 2), vbFromUnicode)
For i = 0 To UBound(Filebyte)
If i Mod 2 = 0 Then
Fbyte(i) = Filebyte(i + 1)
Else
Fbyte(i) = Filebyte(i - 1)
End If
Next
FileNumber = FreeFile
If Dir(OutputUBEfile) <> "" Then Kill (OutputUBEfile)
Open OutputUBEfile For Binary As #FileNumber
Put #FileNumber, , Fbyte '保存文件内容，程序自动加上了Unicode(Big Endian)文件头BOM标志FEFF
Close #FileNumber
UTF8ToUBE = True
Else
UTF8ToUBE = False: Exit Function
End If
End Function

'UTF-8文本文件转换为Ansi纯文本文件
Private Function UTF8ToAnsi(ByVal InputUTF8file As String, ByVal OutputAnsifile As String) As Boolean
Dim Filebyte() As Byte ', Fbyte() As Byte
Dim sAnsi As String, retLen As Long, FileNumber As Long
Dim sUTF8Buffer As String, S As String
'Dim i As Long

On Error Resume Next

'打开UTF-8文本文件InputUTF8file
FileNumber = FreeFile
If Dir(InputUTF8file) = "" Then UTF8ToAnsi = False: Exit Function
Open InputUTF8file For Binary As #FileNumber
ReDim Filebyte(LOF(FileNumber) - 1)
Get #FileNumber, , Filebyte
Close #FileNumber

If Hex$(Filebyte(0)) = "EF" And Hex$(Filebyte(1)) = "BB" And Hex$(Filebyte(2)) = "BF" Then
S = Filebyte
Else
MsgBox (InputUTF8file & " 为非UTF-8编码格式文件!")
UTF8ToAnsi = False: Exit Function
End If
sAnsi = StrConv(S, vbUnicode) '转换为VB6可显示的字符串
retLen = MultiByteToWideChar(CP_UTF8, 0, sAnsi, -1, vbNullString, 0) '取得转换后需要的空间大小retLen

If retLen > 0 Then
sUTF8Buffer = String$(retLen * 2, vbNullChar) '设置缓冲区大小
retLen = MultiByteToWideChar(CP_UTF8, 0, sAnsi, -1, sUTF8Buffer, retLen * 2) '开始转换
Else
UTF8ToAnsi = False: Exit Function
End If

'保存为Ansi纯文本文件OutputAnsifile
If retLen > 0 Then
S = Left$(sUTF8Buffer, retLen * 2)
S = StrConv(S, vbFromUnicode)
Mid$(S, 1, 1) = " ": S = Trim(S)
FileNumber = FreeFile
If Dir(OutputAnsifile) <> "" Then Kill (OutputAnsifile)
Open OutputAnsifile For Binary As #FileNumber
Put #FileNumber, , S '保存文件内容
Close #FileNumber
UTF8ToAnsi = True
Else
UTF8ToAnsi = False: Exit Function
End If
End Function

'Unicode(Little Endian)文本文件转换为Ansi纯文本文件
Private Function ULEToAnsi(ByVal InputULEfile As String, ByVal OutputAnsifile As String) As Boolean
Dim Filebyte() As Byte ', Fbyte() As Byte
Dim sAnsi As String, retLen As Long, FileNumber As Long
Dim sUnicodeBuffer() As Byte, S As String
'Dim i As Long

On Error Resume Next

'打开Unicode(Little Endian)文本文件InputULEfile
FileNumber = FreeFile
If Dir(InputULEfile) = "" Then ULEToAnsi = False: Exit Function
Open InputULEfile For Binary As #FileNumber
ReDim Filebyte(LOF(FileNumber) - 1)
Get #FileNumber, , Filebyte
Close #FileNumber

If Hex$(Filebyte(0)) = "FF" And Hex$(Filebyte(1)) = "FE" Then
S = Filebyte
Else
MsgBox (InputULEfile & " 为非Unicode(Little Endian)编码格式文件!")
ULEToAnsi = False: Exit Function
End If
sAnsi = StrConv(S, vbNarrow)  '转换为VB6可显示的字符串
'到这个地方，应该说可以结束了，VB6用StrConv转换，直接将sAnsi存入文件即可
'下面是用API转换为Ansi代码
sAnsi = S
retLen = WideCharToMultiByte(CP_ACP, 0, StrPtr(sAnsi), -1, vbNullString, 0, vbNullString, 0) '取得转换后需要的空间大小retLen

If retLen > 0 Then
ReDim sUnicodeBuffer(retLen * 2 - 1) ' String$(retLen * 2, vbNullChar)'设置缓冲区大小
retLen = WideCharToMultiByte(CP_ACP, 0, StrPtr(sAnsi), -1, sUnicodeBuffer(0), retLen * 2, vbNullString, 0) '开始转换
Else
ULEToAnsi = False: Exit Function
End If

'保存为Ansi纯文本文件OutputAnsifile
If retLen > 0 Then
ReDim Preserve sUnicodeBuffer(retLen - 1)
S = StrConv(sUnicodeBuffer, vbUnicode)
Mid$(S, 1, 1) = " ": S = Trim(S)
FileNumber = FreeFile
If Dir(OutputAnsifile) <> "" Then Kill (OutputAnsifile)
Open OutputAnsifile For Binary As #FileNumber
Put #FileNumber, , S '保存文件内容
Close #FileNumber
ULEToAnsi = True
Else
ULEToAnsi = False: Exit Function
End If
End Function

'Unicode(Little Endian)文本文件转换为Unicode Big Endian文本文件。
'Unicode Big Endian文本文件转换为Unicode(Little Endian)文本文件，
'只须将Hex$(Filebyte(0)) = "FF" And Hex$(Filebyte(1)) = "FE"改为
'Hex$(Filebyte(0)) = "FE" And Hex$(Filebyte(1)) = "FF"即可。
Private Function ULEToUBE(ByVal InputULEfile As String, ByVal OutputUBEfile As String) As Boolean
Dim Filebyte() As Byte, Fbyte() As Byte
'Dim sAnsi As String, retLen As Long
'Dim sUnicodeBuffer() As Byte, S As String
Dim i As Long, FileNumber As Long

On Error Resume Next

'打开Unicode(Little Endian)文本文件InputULEfile
FileNumber = FreeFile
If Dir(InputULEfile) = "" Then ULEToUBE = False: Exit Function
Open InputULEfile For Binary As #FileNumber
ReDim Filebyte(LOF(FileNumber) - 1), Fbyte(LOF(FileNumber) - 1)
Get #FileNumber, , Filebyte
Close #FileNumber

If Hex$(Filebyte(0)) = "FF" And Hex$(Filebyte(1)) = "FE" Then
'Unicode(Little Endian)编码格式文件
Else
MsgBox (InputULEfile & " 为非Unicode(Little Endian)编码格式文件!")
ULEToUBE = False: Exit Function
End If

For i = 0 To UBound(Filebyte)
If i Mod 2 = 0 Then
Fbyte(i) = Filebyte(i + 1)
Else
Fbyte(i) = Filebyte(i - 1)
End If
Next

'保存为Unicode Big Endian文本文件OutputUBEfile

FileNumber = FreeFile
If Dir(OutputUBEfile) <> "" Then Kill (OutputUBEfile)
Open OutputUBEfile For Binary As #FileNumber
Put #FileNumber, , Fbyte '保存文件内容
Close #FileNumber
End Function

'Unicode(Little Endian)文本文件转换为UTF-8文本文件
Private Function ULEToUTF8(ByVal InputULEfile As String, ByVal OutputUTF8file As String) As Boolean
Dim Filebyte() As Byte ', Fbyte() As Byte
Dim sAnsi As String, retLen As Long, FileNumber As Long
Dim sUTF8Buffer() As Byte, S As String

On Error Resume Next

'打开Unicode(Little Endian)文本文件InputULEfile
FileNumber = FreeFile
If Dir(InputULEfile) = "" Then ULEToUTF8 = False: Exit Function
Open InputULEfile For Binary As #FileNumber
ReDim Filebyte(LOF(FileNumber) - 1)
Get #FileNumber, , Filebyte
Close #FileNumber
If Hex$(Filebyte(0)) = "FF" And Hex$(Filebyte(1)) = "FE" Then
S = Filebyte
Else
MsgBox (InputULEfile & " 为非Unicode(Little Endian)编码格式文件!")
ULEToUTF8 = False: Exit Function
End If
sAnsi = StrConv(S, vbNarrow)  '转换为VB6可显示的字符串
Mid$(sAnsi, 1, 1) = " ": sAnsi = Trim(sAnsi)
retLen = WideCharToMultiByte(CP_UTF8, 0, StrPtr(sAnsi), -1, vbNullString, 0, vbNullString, 0) '取得转换后需要的空间大小retLen

If retLen > 0 Then
ReDim sUTF8Buffer(retLen - 1) ' = String$(retLen, vbNullChar) '设置缓冲区大小
retLen = WideCharToMultiByte(CP_UTF8, 0, StrPtr(sAnsi), -1, sUTF8Buffer(0), retLen, vbNullString, 0) '开始转换
Else
ULEToUTF8 = False: Exit Function
End If

'保存为UTF-8文本文件OutputUTF8file
If retLen > 0 Then
ReDim Preserve sUTF8Buffer(retLen - 1)
S = StrConv(sUTF8Buffer, vbUnicode)
FileNumber = FreeFile
If Dir(OutputUTF8file) <> "" Then Kill (OutputUTF8file)
Open OutputUTF8file For Binary As #FileNumber
Put #FileNumber, , &HBFBBEF '加上UTF-8文件头BOM标志EFBBBF
Put #FileNumber, 4, S '保存文件内容
Close #FileNumber
ULEToUTF8 = True
Else
ULEToUTF8 = False: Exit Function
End If
End Function

Private Sub Command1_Click()
'先新建一个Ansi纯文本文件"d:/AnsiCodeFile.txt"
'Ansi纯文本文件转换为Unicode(Little Endian)文本文件
Call AnsiToULE("d:/AnsiCodeFile.txt", "d:/AnsiToUnicodeLEFile.txt")

'Ansi纯文本文件转换为Unicode(Big Endian)文本文件
Call AnsiToUBE("d:/AnsiCodeFile.txt", "d:/AnsiToUnicodeBEFile.txt")

'Ansi纯文本文件转换为UTF-8文本文件
Call AnsiToUTF8("d:/AnsiCodeFile.txt", "d:/AnsiToUTF8File.txt")

'UTF-8文本文件转换为Unicode(Little Endian)文本文件
Call UTF8ToULE("d:/AnsiToUTF8File.txt", "d:/UTF8ToUnicodeLEFile.txt")

'UTF-8文本文件转换为Unicode Big Endian文本文件
Call UTF8ToUBE("d:/AnsiToUTF8File.txt", "d:/UTF8ToUnicodeBEFile.txt")

'UTF-8文本文件转换为Ansi纯文本文件
Call UTF8ToAnsi("d:/AnsiToUTF8File.txt", "d:/UTF8ToAnsiFile.txt")

'Unicode(Little Endian)文本文件转换为Ansi纯文本文件
Call ULEToAnsi("d:/AnsiToUnicodeLEFile.txt", "d:/UnicodeLEToAnsiFile.txt")

'Unicode(Little Endian)文本文件转换为Unicode Big Endian文本文件
Call ULEToUBE("d:/AnsiToUnicodeLEFile.txt", "d:/UnicodeLEToUnicodeBEFile.txt")

'Unicode(Little Endian)文本文件转换为UTF-8文本文件
Call ULEToUTF8("d:/AnsiToUnicodeLEFile.txt", "d:/UnicodeLEToUTF8File.txt")
End Sub