84 lines
4.2 KiB
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84 lines
4.2 KiB
HTML
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<HTML><HEAD><TITLE>Tcl Built-In Commands - encoding manual page</TITLE></HEAD><BODY>
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<DL>
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<DD><A HREF="encoding.htm#M2" NAME="L180">NAME</A>
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<DL><DD>encoding - Manipulate encodings</DL>
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<DD><A HREF="encoding.htm#M3" NAME="L181">SYNOPSIS</A>
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<DL>
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<DD><B>encoding </B><I>option</I> ?<I>arg arg ...</I>?
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</DL>
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<DD><A HREF="encoding.htm#M4" NAME="L182">INTRODUCTION</A>
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<DD><A HREF="encoding.htm#M5" NAME="L183">DESCRIPTION</A>
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<DL>
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<DD><A HREF="encoding.htm#M6" NAME="L184"><B>encoding convertfrom ?</B><I>encoding</I>? <I>data</I></A>
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<DD><A HREF="encoding.htm#M7" NAME="L185"><B>encoding convertto ?</B><I>encoding</I>? <I>string</I></A>
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<DD><A HREF="encoding.htm#M8" NAME="L186"><B>encoding names</B></A>
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<DD><A HREF="encoding.htm#M9" NAME="L187"><B>encoding system</B> ?<I>encoding</I>?</A>
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</DL>
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<DD><A HREF="encoding.htm#M10" NAME="L188">EXAMPLE</A>
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<DD><A HREF="encoding.htm#M11" NAME="L189">SEE ALSO</A>
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<DD><A HREF="encoding.htm#M12" NAME="L190">KEYWORDS</A>
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</DL><HR>
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<H3><A NAME="M2">NAME</A></H3>
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encoding - Manipulate encodings
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<H3><A NAME="M3">SYNOPSIS</A></H3>
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<B>encoding </B><I>option</I> ?<I>arg arg ...</I>?<BR>
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<H3><A NAME="M4">INTRODUCTION</A></H3>
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Strings in Tcl are encoded using 16-bit Unicode characters. Different
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operating system interfaces or applications may generate strings in
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other encodings such as Shift-JIS. The <B>encoding</B> command helps
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to bridge the gap between Unicode and these other formats.
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<H3><A NAME="M5">DESCRIPTION</A></H3>
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Performs one of several encoding related operations, depending on
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<I>option</I>. The legal <I>option</I>s are:
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<P>
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<DL>
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<P><DT><A NAME="M6"><B>encoding convertfrom ?</B><I>encoding</I>? <I>data</I></A><DD>
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Convert <I>data</I> to Unicode from the specified <I>encoding</I>. The
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characters in <I>data</I> are treated as binary data where the lower
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8-bits of each character is taken as a single byte. The resulting
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sequence of bytes is treated as a string in the specified
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<I>encoding</I>. If <I>encoding</I> is not specified, the current
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system encoding is used.
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<P><DT><A NAME="M7"><B>encoding convertto ?</B><I>encoding</I>? <I>string</I></A><DD>
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Convert <I>string</I> from Unicode to the specified <I>encoding</I>.
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The result is a sequence of bytes that represents the converted
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string. Each byte is stored in the lower 8-bits of a Unicode
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character. If <I>encoding</I> is not specified, the current
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system encoding is used.
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<P><DT><A NAME="M8"><B>encoding names</B></A><DD>
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Returns a list containing the names of all of the encodings that are
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currently available.
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<P><DT><A NAME="M9"><B>encoding system</B> ?<I>encoding</I>?</A><DD>
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Set the system encoding to <I>encoding</I>. If <I>encoding</I> is
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omitted then the command returns the current system encoding. The
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system encoding is used whenever Tcl passes strings to system calls.
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<P></DL>
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<H3><A NAME="M10">EXAMPLE</A></H3>
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It is common practice to write script files using a text editor that
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produces output in the euc-jp encoding, which represents the ASCII
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characters as singe bytes and Japanese characters as two bytes. This
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makes it easy to embed literal strings that correspond to non-ASCII
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characters by simply typing the strings in place in the script.
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However, because the <B><A HREF="../TkCmd/source.htm">source</A></B> command always reads files using the
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ISO8859-1 encoding, Tcl will treat each byte in the file as a separate
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character that maps to the 00 page in Unicode. The
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resulting Tcl strings will not contain the expected Japanese
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characters. Instead, they will contain a sequence of Latin-1
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characters that correspond to the bytes of the original string. The
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<B>encoding</B> command can be used to convert this string to the
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expected Japanese Unicode characters. For example,
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<PRE>set s [encoding convertfrom euc-jp "\xA4\xCF"]</PRE>
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would return the Unicode string "\u306F", which is the Hiragana
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letter HA.
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<H3><A NAME="M11">SEE ALSO</A></H3>
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<B><A HREF="../TkLib/Encoding.htm">Tcl_GetEncoding</A></B>
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<H3><A NAME="M12">KEYWORDS</A></H3>
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<A href="../Keywords/E.htm#encoding">encoding</A>
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<HR><PRE>
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<A HREF="../copyright.htm">Copyright</A> © 1998 by Scriptics Corporation.
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<A HREF="../copyright.htm">Copyright</A> © 1995-1997 Roger E. Critchlow Jr.</PRE>
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</BODY></HTML>
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