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simple question about bytes [message #16986]

Thu, 02 September 1999 00:00

Gerhard D. Rappold
Messages: 10
Registered: March 1998

Junior Member

Hi,

I want to check if a line in an ascii file starts with a number or
character. My idea was to read the first character and convert it to
"byte" and check if its in or out the range of '48b' and '58b'. The code
example is :

; check for header
header=''
readf, lun, header
firstchar=strmid(header,0,1)
first_byte=byte(firstchar)

no_head=0
head_index=0
WHILE ((first_byte LT 48b) AND (first_byte GT 57b)) DO BEGIN
readf, lun, header ; reads next line
head_index=head_index+1 ; counts header lines
no_header =head_index
ENDWHILE
...

it compiles fine but on runtime I get the errormessage :

Expression must be a scalar in this context: <BYTE Array(1)>

How can I change the variable 'first_byte' from byte array to a byte
scalar ?

Or any other hint for a solution would be great!

Thank's

Gerhard

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[Message index]

		simple question about bytes By: Gerhard D. Rappold on Thu, 02 September 1999 00:00
		Re: simple question about bytes By: R.Bauer on Fri, 03 September 1999 00:00
		Re: simple question By: Paul van Delst on Fri, 19 May 2000 00:00
		Re: simple question By: promashkin on Thu, 18 May 2000 00:00
		Re: simple question By: Paul van Delst on Thu, 18 May 2000 00:00
		Re: simple question By: Craig Markwardt on Thu, 18 May 2000 00:00

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