help on conserving CPU usage

i am programming a smart card and i was wondering if i could halt my codes until a card is detected present at the smart card reader without using a loop. using a loop until a card is detected can do the job but it eats a lot of the CPU usage. i would like to execute my codes until a change in status is detected, ie. a smart card is detected. sleep can't help either. can someone help me on this problem?

first of all welcome to vbforums.
I was really searching for a person who does smart card programing
there should be something for that. i still use the timer to findout the status.

thanks, i'm not really familiar with the accessing of the timings. i just followed the sample codes packaged with the product.

what reader and sdks you are using

ACR's the card is ACOS2. the one with the processsors. i'm trying to create a program that will respond to a smart card present in real time without using too much of the CPU.

i am also using the same things here...

how do you update your status of the reader?

by checking continuously using the timer event

Quote:

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Originally Posted by uchiha-kakashi

i am programming a smart card and i was wondering if i could halt my codes until a card is detected present at the smart card reader without using a loop. using a loop until a card is detected can do the job but it eats a lot of the CPU usage. i would like to execute my codes until a change in status is detected, ie. a smart card is detected. sleep can't help either. can someone help me on this problem?

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add a timer to your form.. and in the form_load event add

VB Code:

Private Sub Form_Load()
Timer1.Interval = 500
Timer1.Enabled = True
'----- Rest of your Form load code..

and in the timer event you add your check for card code

VB Code:

Private Sub Timer1_Timer()
'---- Query Port for card..
End Sub

This will check for card details every .5 of a second (will Give near immidiate responce too) with out slaveing the proccesor..

Gremmy....