详解VB6实现MUI程序

来源:网络时间:2011-06-23

  本文将为大家详细讲述的是VB6实现MUI程序方法,希望本文能给大家的日常开发工作带来一些启示。

  之前,我负责一个VB6编写的办公自动化系统,要求能在运行时,支持在不同语言间切换(英文,中文,日文,德文,法文和西班牙文);实质就是实现一个VB6的MUI程序.

  这个需要的困难在于VB6显示文本的标准控件(Label,Textbox等)不支持Unicode;但字符串在其内部是按Unicode保存的,也就是说VB6本身是支持Unicode的.

  VB6中,标准控件显示字符串的过程如下:

  1) 标准控件先将Unicode字符串转换成ANSI字符串;

  2) 标准控件尝试将ANSI字符串转换成其Font.Charset属性中指定的字符集格式的字符串;如果转换失败,则显示为问号(?).

  具体可参照:Display Unicode Strings in Visual Basic 6.0.

  因此,实现MUI程序的思路有两种:

  1) 将标准控件替换为能支持Unicode的控件;

  2) 将资源文件中不同字符集的文本,转换为ANSI格式,提供给标准控件使用;

  第1)种方式可用 Forms 2.0 (fm20.dll);

  第2)种方式,我在网上找到两篇文章,但各有不足:

  a) Auto-Detect Language and Display Unicode in VB6 TextBox and Label Controls;

  ChilkatCharset2控件需购买,具对日文的一些标点符号(如全角句号)不支持.

  b) How To Convert from ANSI to Unicode & Unicode to ANSI for OLE

  没有测试成功.

  下面,着重介绍我自己认为比较成功的实现,它使用了ADODB.Stream(msado25.tlb);其实现思路如下:

  1) 将程序中用到的文本保存为Unicode格式的资源文件中;

  之所以将资源文本保存为双字节的Unicode格式,而非Utf8或Utf7格式,可省去从其它格式向VB6支持的Unicode格式转换过程.

  2) 将显示文本的标准控件的Font.Charset,设置为程序要显示语言所对应的字符集,并设置一种支持这种字符集的字体到Font.Name属性

  If g_Str.NumJapanese > 0 Then

  charset = "Shift_JIS"

  Text1.Font.Name = "MS UI Gothic"

  Text1.Font.charset = 128

  ElseIf g_Str.NumKorean > 0 Then

  charset = "ks_c_5601-1987"

  Text1.Font.Name = "GulimChe"

  Text1.Font.charset = 129

  ElseIf g_Str.NumCentralEuro > 0 Then

  charset = "windows-1250"

  Text1.Font.Name = "Arial"

  Text1.Font.charset = 238

  ElseIf g_Str.NumArabic > 0 Then

  charset = "windows-1256"

  Text1.Font.Name = "Traditional Arabic"

  Text1.Font.charset = 178

  ElseIf g_Str.NumHebrew > 0 Then

  charset = "windows-1255"

  Text1.Font.Name = "David"

  Text1.Font.charset = 177

  ElseIf g_Str.NumCyrillic > 0 Then

  charset = "windows-1251"

  Text1.Font.Name = "Arial"

  Text1.Font.charset = 204

  ElseIf g_Str.NumGreek > 0 Then

  charset = "windows-1253"

  Text1.Font.Name = "Arial"

  Text1.Font.charset = 161

  ElseIf g_Str.NumThai > 0 Then

  charset = "windows-874"

  Text1.Font.Name = "Angsana New"

  Text1.Font.charset = 222

  ElseIf g_Str.NumChinese > 0 Then

  charset = "gb2312"

  Text1.Font.Name = "SimSun"

  Text1.Font.charset = 134

  ' An alternative is to use Big5:

  ' Text1.Font.Name = "MingLiu"

  'charset = "big5"

  'fontCh = 136

  Else

  charset = "windows-1252"

  Text1.Font.charset = 0

  Text1.Font.Name = "Arial" End If 3)

  根据要显示的语言,利用ADODB.Stream将资源文件中Unicode格式保存的字符串转换成操作系统的区域语言(Locale)支持字符集的字符串;

  ' 调用API来获取操作系统默认的区域语言设置(LocaleID)

  Private Declare Function GetSystemDefaultLCID Lib "kernel32" () As Long

  ' 将Unicode字符串,转换为指定字符集的字节数组;

  ' 用于转换用资源文件中读取的文本;

  Public Function ConvertStringToBytes(ByRef strText As String, charset As String) As Byte()

  Dim objStream As ADODB.Stream

  Dim data() As Byte

  ' init stream

  Set objStream = New ADODB.Stream

  objStream.charset = charset

  objStream.Mode = adModeReadWrite

  objStream.Type = adTypeText

  objStream.Open

  ' write bytes into stream

  objStream.WriteText strText

  objStream.Flush

  ' rewind stream and read text

  objStream.Position = 0

  objStream.Type = adTypeBinary '

  objStream.Read 3 ' skip first 3 bytes as this is the utf-8 marker

  data = objStream.Read()

  ' close up and return

  objStream.Close

  ConvertStringToUtf8Bytes = data

  End Function '

转换为指定字符集的字节数组,转换为ANSI(即LocaleID)对应的字符集的字符串; ' 用于将ConvertStringToBytes()返回的字节数组转换为GetCharset()字符集的字符串.

  Public Function ConvertBytesToString(ByRef data() As Byte, charset As String) As String

  Dim objStream As ADODB.Stream

  Dim strTmp As String

  ' init stream

  Set objStream = New ADODB.Stream

  objStream.charset = charset

  objStream.Mode = adModeReadWrite

  objStream.Type = adTypeBinary

  objStream.Open

  ' write bytes into stream

  objStream.Write data

  objStream.Flush

  ' rewind stream and read text

  objStream.Position = 0

  objStream.Type = adTypeText

  strTmp = objStream.ReadText

  ' close up and return

  objStream.Close

  ConvertUtf8BytesToString = strTmp

  End Function

  '获取操作系统默认区域语言对应的字符集

  Public Function GetCharset() As String

  Dim localeId As Long

  Dim charset As String

  ' 获取操作系统的LocaleId

  localeId = GetSystemDefaultLCID()

  Select Case localeId

  Case 1033

  charset = "windows-1252"

  Case 2052

  charset = "gb2312"

  Case 1041

  charset = "Shift_JIS"

  Case Else

  charset = "windows-1252"

  End Select

  GetCharset = charset End Function

  '显示资源文本中的文本

  Private Sub DisplayText(filename As String)

  '保存资源文本中的文本的变量

  Dim textBytes As Variant

  Dim f As New FileSystemObject

  Dim fs As TextStream

  '将Unicode文本读取到变量中

  Set fs = f.OpenTextFile(filename, ForReading, False, TristateTrue)

  Do While Not fs.AtEndOfStream

  textBytes = fs.ReadAll

  Loop fs.Close

  ' Convert to a Unicode string:

  Dim s As String

  s = textBytes

  Dim t As Long

  ' CkString是免费的第三方组件,可自动判定一个字符串所对应的字符集

  ' 下载地址:http://www.chilkatsoft.com/download/CkString.zip

  Dim g_Str As New CkString

  g_Str.Str = s

  '获取资源文本所代表的字符集名称,设置对应的字体和字符集到textbox上

  Dim charset As String

  If g_Str.NumJapanese > 0 Then '日文

  charset = "Shift_JIS"

  Text1.Font.Name = "MS UI Gothic"

  Text1.Font.charset = 128

  ElseIf g_Str.NumKorean > 0 Then '韩语

  charset = "ks_c_5601-1987"

  Text1.Font.Name = "GulimChe"

  Text1.Font.charset = 129

  ElseIf g_Str.NumCentralEuro > 0 Then '中欧语言

  charset = "windows-1250"

  Text1.Font.Name = "Arial"

  Text1.Font.charset = 238

  ElseIf g_Str.NumArabic > 0 Then '阿拉伯语

  charset = "windows-1256"

  Text1.Font.Name = "Traditional Arabic"

  Text1.Font.charset = 178

  ElseIf g_Str.NumGreek > 0 Then '希腊语

  charset = "windows-1253"

  Text1.Font.Name = "Arial"

  Text1.Font.charset = 161

  ElseIf g_Str.NumThai > 0 Then '泰语

  charset = "windows-874"

  Text1.Font.Name = "Angsana New"

  Text1.Font.charset = 222

  ElseIf g_Str.NumChinese > 0 Then '中文

  charset = "gb2312"

  Text1.Font.Name = "SimSun"

  Text1.Font.charset = 134

  ' 繁体则使用Big5:

  ' Text1.Font.Name = "MingLiu"

  'charset = "big5"

  'Text1.Font.charset = 136

  Else '默认值

  charset = "windows-1252"

  Text1.Font.charset = 0

  Text1.Font.Name = "Arial"

  End If

  Dim bytes() As Byte

  Dim g_OSCharset As String

  '获取操作系统默认语言对应的字符集

  g_OSCharset = GetCharset()

  '先将Unicode资源文本转换成对应的字节数组;

  bytes = ConvertStringToBytes(s, charset)

  '将字节数组转换成ANSI(即默认字符集)对应的字符串

  vbstr2 = ConvertBytesToString(bytes, g_OSCharset)

  ' 设置字符串到VB6的标准控件中

  Me.Text1.Text = vbstr2 End Sub

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