08-10-2012
Quote:
Originally Posted by
LMSteed
More details.. line one of my files contains the same thing.. which represents the filename I'd like to use as my output file. The second line contains statistics on a single channel of data. All of this is because I can't get the software vendor to export the statistics nicely. So the process is to open a file, read the first line, set it as the output variable name, and then process all the files for data on their second line sending all of this data to the same output file. This was my easiest option.. The only other option I have is to process a file that contains all of the data streams in column form. Column 1 would be abscissa data, Column 2 oridinate for channel 2, then ordinate for channel 3, so on and so on.. but when talking time domain data, these files are too large to 1) output and 2) process. When talking frequency domain data, I think it would be easy but I would most likely switch over to Matlab. I wrote an AWK script awhile ago for interactively switching RBE2s to RBE3s in NEdit and found that it was a great utility. Thanks for all your help.. one of these days I will understand the {}. I would like to find a good way to generate an awk error file, but based on all my recent google searches I think I can find a way to do it. Thanks again!
You're welcome.
Note that if you had given us all of this information in your original post you would have had a working solution hours earlier and saved some of us a lot of extra work.
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close(n) Tcl Built-In Commands close(n)
__________________________________________________________________________________________________________________________________________________
NAME
close - Close an open channel
SYNOPSIS
close channelId
_________________________________________________________________
DESCRIPTION
Closes the channel given by channelId.
ChannelId must be an identifier for an open channel such as a Tcl standard channel (stdin, stdout, or stderr), the return value from an
invocation of open or socket, or the result of a channel creation command provided by a Tcl extension.
All buffered output is flushed to the channel's output device, any buffered input is discarded, the underlying file or device is closed,
and channelId becomes unavailable for use.
If the channel is blocking, the command does not return until all output is flushed. If the channel is nonblocking and there is unflushed
output, the channel remains open and the command returns immediately; output will be flushed in the background and the channel will be
closed when all the flushing is complete.
If channelId is a blocking channel for a command pipeline then close waits for the child processes to complete.
If the channel is shared between interpreters, then close makes channelId unavailable in the invoking interpreter but has no other effect
until all of the sharing interpreters have closed the channel. When the last interpreter in which the channel is registered invokes close,
the cleanup actions described above occur. See the interp command for a description of channel sharing.
Channels are automatically closed when an interpreter is destroyed and when the process exits. Channels are switched to blocking mode, to
ensure that all output is correctly flushed before the process exits.
The command returns an empty string, and may generate an error if an error occurs while flushing output. If a command in a command pipe-
line created with open returns an error, close generates an error (similar to the exec command.)
EXAMPLE
This illustrates how you can use Tcl to ensure that files get closed even when errors happen by combining catch, close and return:
proc withOpenFile {filename channelVar script} {
upvar 1 $channelVar chan
set chan [open $filename]
catch {
uplevel 1 $script
} result options
close $chan
return -options $options $result
}
SEE ALSO
file(n), open(n), socket(n), eof(n), Tcl_StandardChannels(3)
KEYWORDS
blocking, channel, close, nonblocking
Tcl 7.5 close(n)