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eof.3tcl

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NAME

eof - Check for end of file condition on channel

SYNOPSIS

eof channelId

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DESCRIPTION

Returns 1 if an end of file condition occurred during the most recent input operation on channelId (such as gets), 0 otherwise.

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.

EXAMPLES

Read and print out the contents of a file line-by-line:

 
 set f [open somefile.txt]
 while {1} {
     set line [gets $f]
     if {[eof $f]} {
         close $f
         break
     }
     puts "Read line: $line"
 }
 
 

Read and print out the contents of a file by fixed-size records:

 
 set f [open somefile.dat]
 fconfigure $f -translation binary
 set recordSize 40
 while {1} {
     set record [read $f $recordSize]
     if {[eof $f]} {
         close $f
         break
     }
     puts "Read record: $record"
 }
 
 

SEE ALSO

file(3tcl), open(3tcl), close(3tcl), fblocked(3tcl), Tcl_StandardChannels(3tcl)

KEYWORDS

channel, end of file