Subj : filemode
To   : Chris Hoppman
From : Jasen Betts
Date : Tue Jul 06 2004 08:07 pm

Hello Chris.

05 Jul 04 08:00, you wrote to all:

 CH> I found the snippet on the html swag that explain'd it.

 CH> http://www.bsdg.org/SWAG/FILES/0003.PAS.html

 CH> now, i am having trouble with blockread/write.

 CH> I want to write to a file using a record that will allow only
 CH> the used length of the vars to be wrote.

that sounds like it would need variable length records in the file,
so yeah using type file and blockread/blockwrite is the right start.

for reading and writing you can either compose all the fileds together into an 
array of bytes (or chars etc) and write it in a single operation or read and 
write the fields indiidually.

 CH> for the life of me remember how I did it.  I think I used a
 CH> pchar in the $x+ state with a array[0..1023] of char linking
 CH> the pchar and the array and using StrPas or StrCopy to copy
 CH> to a string to store in a record.

Sounds like the first method.

 CH> type
 CH>    TBuffer = {$ifdef} virualpascal {$enddef} record
 CH>       ch : char;
 CH>    end;


 CH> var
 CH>   Buffer  : array[0..1023] of ^TBuffer;
 CH>   PBuffer : PChar;

 CH> Which sucks cause I would have to referance each one with the
 CH> brackets
 CH> [xx] buffer[xx].^ch, but would accompish what I want, but I think
 CH> there is a better way.

Why do you want an array of pointers? (i think it should be an array of char)

Jasen

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