Basic Characteristics RAPID

ReadNum Reads a number from a file or the serial channel
Example
ReadNum (Read Numeric) is used to read a number from a character-based file or the
serial channel.
VAR iodev infile;
.
Open "flp1:file.doc", infile\Read;
reg1 := ReadNum(infile);
Reg1 is assigned a number read from the file file.doc on the diskette.
Return value Data type: num
Arguments
The numeric value read from a specified file. If the file is empty (end of file), the
number 9.999E36 is returned.
ReadNum (IODevice [\Time])
IODevice Data type: iodev
The name (reference) of the file to be read.
[\Time] Data type: num
Program execution
The max. time for the reading operation (timeout) in seconds. If this argument is
not specified, the max. time is set to 60 seconds.
If this time runs out before the read operation is finished, the error handler will
be called with the error code ERR_DEV_MAXTIME. If there is no error handler,
the execution will be stopped.
The timeout function is also in use during program stop and will be noticed in
RAPID program at program start.
The function reads a line from a file, i.e. reads everything up to and including the next
line-feed character (LF), but not more than 80 characters. If the line exceeds 80 characters,
the remainder of the characters will be read on the next reading.
RAPID Reference Manual 9-ReadNum-1