12-11-2009
Can't the "statistic_program" directly read the input file?
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LEARN ABOUT OPENDARWIN
read
read(n) Tcl Built-In Commands read(n)
__________________________________________________________________________________________________________________________________________________
NAME
read - Read from a channel
SYNOPSIS
read ?-nonewline? channelId
read channelId numChars
_________________________________________________________________
DESCRIPTION
In the first form, the read command reads all of the data from channelId up to the end of the file. If the -nonewline switch is specified
then the last character of the file is discarded if it is a newline. In the second form, the extra argument specifies how many characters
to read. Exactly that many characters will be read and returned, unless there are fewer than numChars left in the file; in this case all
the remaining characters are returned. If the channel is configured to use a multi-byte encoding, then the number of characters read may
not be the same as the number of bytes read.
ChannelId must be an identifier for an open channel such as the Tcl standard input channel (stdin), the return value from an invocation of |
open or socket, or the result of a channel creation command provided by a Tcl extension. The channel must have been opened for input.
If channelId is in nonblocking mode, the command may not read as many characters as requested: once all available input has been read, the
command will return the data that is available rather than blocking for more input. If the channel is configured to use a multi-byte
encoding, then there may actually be some bytes remaining in the internal buffers that do not form a complete character. These bytes will
not be returned until a complete character is available or end-of-file is reached. The -nonewline switch is ignored if the command returns
before reaching the end of the file.
Read translates end-of-line sequences in the input into newline characters according to the -translation option for the channel. See the
fconfigure manual entry for a discussion on ways in which fconfigure will alter input.
USE WITH SERIAL PORTS
For most applications a channel connected to a serial port should be configured to be nonblocking: fconfigure channelId -blocking 0. Then
read behaves much like described above. Care must be taken when using read on blocking serial ports:
read channelId numChars
In this form read blocks until numChars have been received from the serial port.
read channelId
In this form read blocks until the reception of the end-of-file character, see fconfigure -eofchar. If there no end-of-file charac-
ter has been configured for the channel, then read will block forever.
SEE ALSO
file(n), eof(n), fblocked(n), fconfigure(n), Tcl_StandardChannels(3)
KEYWORDS
blocking, channel, end of line, end of file, nonblocking, read, translation, encoding
Tcl 8.1 read(n)