how to read from a magnetic card reader

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  • Posted by oscarezio Jan 13, 2011
  • 1315 views

Hi everybody I have the next issue: I have a magnetic card reader connected to a windows xp computer via usb
I have to read 2 tracks each time I swipe a card the problem I face is that
some cards comes with 2 tracks while other comes with 3 tracks
I have tried to read it char by char with the next code 

-- wait until there is something to read  
while get_key()=-1 do 
end while 
-- start reading 
while 1=1 do 
   vca=get_key() 
   if vca=-1 then 
      exit 
   else 
      linea=linea&vca 
   end if 
end while

but as soon as it read the first character it stops
maybe it is a simple question but i have not solved it yet
any idea
thanks in advance

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