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是否可以检测到UDP响应编码?

udp vb.net c#

Stefan Steiger Marco van de Voort · 技术社区 · 16 年前

问题:

我通过UDP查询Quake3主服务器,得到如下响应。如您所见,我很难确定服务器发送的内容的编码… 有没有办法检测或设置接收编码?

            baBuffer = new byte[1024*100]; // 100 kb should be enough
        int recv = sctServerConnection.ReceiveFrom(baBuffer, ref tmpRemote);

        Console.WriteLine("Message received from {0}:", tmpRemote.ToString());

        System.Text.Encoding encResponseEncoding = System.Text.Encoding.Default; // Wrong...
        //encResponseEncoding = System.Text.Encoding.ASCII;
        //encResponseEncoding = System.Text.Encoding.UTF8;
        //encResponseEncoding = System.Text.Encoding.GetEncoding(437); // ANSI-DOS
        //encResponseEncoding = System.Text.Encoding.GetEncoding(1252);// ANSI-WestEurope
        //encResponseEncoding = System.Text.Encoding.GetEncoding(1250); // Ansi-Centraleuro
        //encResponseEncoding = System.Text.Encoding.GetEncoding("ISO-8859-1");
        //encResponseEncoding = System.Text.Encoding.GetEncoding("ISO-8859-9");
        //encResponseEncoding = System.Text.Encoding.UTF32;
        encResponseEncoding = System.Text.Encoding.UTF7; // Bingo !

3 回复 | 直到 16 年前

Hans Passant 16 年前

编码(如果实际是文本)由协议决定。如果您没有协议规范,也没有源代码,那么,是的,您必须进行猜测。

Community Mohan Dere 8 年前

没有办法安全地检测编码,您可以猜测它。也见 How can I detect the encoding/codepage of a text file .

Chris Haas 16 年前

你可以找 Byte Order Mark (BOM) . 下面是我使用的一些vb.net代码:

Private Shared Function GetStringFromBytes(ByVal bytes() As Byte) As String
    Dim ByteLegth = bytes.Count
    If (ByteLegth >= 3) AndAlso (bytes(0) = &HEF) AndAlso (bytes(1) = &HBB) AndAlso (bytes(2) = &HBF) Then
        Return System.Text.Encoding.UTF8.GetString(bytes)
    ElseIf (ByteLegth >= 2) AndAlso (bytes(0) = &HFE) AndAlso (bytes(1) = &HFF) Then
        Return System.Text.Encoding.BigEndianUnicode.GetString(bytes)
    ElseIf (ByteLegth >= 2) AndAlso (bytes(0) = &HFF) AndAlso (bytes(1) = &HFE) Then
        Return System.Text.Encoding.Unicode.GetString(bytes)
    ElseIf (ByteLegth >= 2) AndAlso (bytes(0) = &H0) AndAlso (bytes(1) = &H0) AndAlso (bytes(2) = &HFE) AndAlso (bytes(3) = &HFF) Then
        Return New System.Text.UTF32Encoding(True, True).GetString(bytes)
    ElseIf (ByteLegth >= 2) AndAlso (bytes(0) = &HFF) AndAlso (bytes(1) = &HFE) AndAlso (bytes(2) = &H0) AndAlso (bytes(3) = &H0) Then
        Return System.Text.Encoding.UTF32.GetString(bytes)
    Else
        'No BOM, assume ASCII
        Return System.Text.Encoding.ASCII.GetString(bytes)
    End If
End Function

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