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encoding(n) Tcl Built-In Commands encoding(n)
encoding - Manipulate encodings
encoding option ?arg arg ...?
Strings in Tcl are encoded using 16-bit Unicode characters. Different operating system
interfaces or applications may generate strings in other encodings such as Shift-JIS. The
encoding command helps to bridge the gap between Unicode and these other formats.
Performs one of several encoding related operations, depending on option. The legal
encoding convertfrom ?encoding? data
Convert data to Unicode from the specified encoding. The characters in data are
treated as binary data where the lower 8-bits of each character is taken as a sin-
gle byte. The resulting sequence of bytes is treated as a string in the specified
encoding. If encoding is not specified, the current system encoding is used.
encoding convertto ?encoding? string
Convert string from Unicode to the specified encoding. The result is a sequence of
bytes that represents the converted string. Each byte is stored in the lower
8-bits of a Unicode character. If encoding is not specified, the current system
encoding is used.
Returns a list containing the names of all of the encodings that are currently
encoding system ?encoding?
Set the system encoding to encoding. If encoding is omitted then the command
returns the current system encoding. The system encoding is used whenever Tcl
passes strings to system calls.
It is common practice to write script files using a text editor that produces output in
the euc-jp encoding, which represents the ASCII characters as singe bytes and Japanese
characters as two bytes. This makes it easy to embed literal strings that correspond to
non-ASCII characters by simply typing the strings in place in the script. However,
because the source command always reads files using the ISO8859-1 encoding, Tcl will treat
each byte in the file as a separate character that maps to the 00 page in Unicode. The
resulting Tcl strings will not contain the expected Japanese characters. Instead, they
will contain a sequence of Latin-1 characters that correspond to the bytes of the original
string. The encoding command can be used to convert this string to the expected Japanese
Unicode characters. For example,
set s [encoding convertfrom euc-jp "\xA4\xCF"]
would return the Unicode string "\u306F", which is the Hiragana letter HA.
Tcl 8.1 encoding(n)
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