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
文章名称:VB6实现MUI程序方法详解
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