1encoding(n) Tcl Built-In Commands encoding(n)
2______________________________________________________________________________
6
8 encoding - Manipulate encodings
9
11 encoding option ?arg arg ...?
12_________________________________________________________________
13
16 Strings in Tcl are encoded using 16-bit Unicode characters. Different
17 operating system interfaces or applications may generate strings in
18 other encodings such as Shift-JIS. The encoding command helps to
19 bridge the gap between Unicode and these other formats.
20
22 Performs one of several encoding related operations, depending on
23 option. The legal options are:
24 encoding convertfrom ?encoding? data
26 Convert data to Unicode from the specified encoding. The char‐
27 acters in data are treated as binary data where the lower 8-bits
28 of each character is taken as a single byte. The resulting
29 sequence of bytes is treated as a string in the specified encod‐
30 ing. If encoding is not specified, the current system encoding
31 is used.
32 encoding convertto ?encoding? string
34 Convert string from Unicode to the specified encoding. The
35 result is a sequence of bytes that represents the converted
36 string. Each byte is stored in the lower 8-bits of a Unicode
37 character. If encoding is not specified, the current system
38 encoding is used.
39 encoding dirs ?directoryList?
41 Tcl can load encoding data files from the file system that │
42 describe additional encodings for it to work with. This command │
43 sets the search path for *.enc encoding data files to the list │
44 of directories directoryList. If directoryList is omitted then │
45 the command returns the current list of directories that make up │
46 the search path. It is an error for directoryList to not be a │
47 valid list. If, when a search for an encoding data file is hap‐ │
48 pening, an element in directoryList does not refer to a read‐ │
49 able, searchable directory, that element is ignored.
50 encoding names
52 Returns a list containing the names of all of the encodings that
53 are currently available.
54 encoding system ?encoding?
56 Set the system encoding to encoding. If encoding is omitted then
57 the command returns the current system encoding. The system
58 encoding is used whenever Tcl passes strings to system calls.
59
61 It is common practice to write script files using a text editor that
62 produces output in the euc-jp encoding, which represents the ASCII
63 characters as singe bytes and Japanese characters as two bytes. This
64 makes it easy to embed literal strings that correspond to non-ASCII
65 characters by simply typing the strings in place in the script. How‐
66 ever, because the source command always reads files using the current
67 system encoding, Tcl will only source such files correctly when the
68 encoding used to write the file is the same. This tends not to be true
69 in an internationalized setting. For example, if such a file was
70 sourced in North America (where the ISO8859-1 is normally used), each
71 byte in the file would be treated as a separate character that maps to
72 the 00 page in Unicode. The resulting Tcl strings will not contain the
73 expected Japanese characters. Instead, they will contain a sequence of
74 Latin-1 characters that correspond to the bytes of the original string.
75 The encoding command can be used to convert this string to the expected
76 Japanese Unicode characters. For example,
77 set s [encoding convertfrom euc-jp "\xA4\xCF"]
78 would return the Unicode string “\u306F”, which is the Hiragana letter
79 HA.
80
83 Tcl_GetEncoding(3)
84
87 encoding
88Tcl 8.1 encoding(n)