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is the usb inserted and the driver loaded, delphi programming

Posted on 2011-03-08
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Last Modified: 2012-05-11
a USB device is inserted into usb port on WinXP computer. in reponse the operating system loads the necessary drivers.

My program is communicating to this usb device using the loaded driver. My problem is to determine if the device has been inserted into the USB and/or if the driver is loaded by the operating system.

If I just go ahead and access the driver before it is initialized I get an access violation. also I need to find a mechanism to detect if the user has removed the device again.

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Question by:HLyder
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4 Comments
 
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Geert Gruwez earned 500 total points
ID: 35074407
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Expert Comment

by:samenglish
ID: 35074571
There is some Delphi code here
http://www.swissdelphicenter.ch/torry/showcode.php?id=2211
http://www.delphi3000.com/articles/article_4841.asp?SK=
http://www.experts-exchange.com/Programming/Languages/Pascal/Delphi/Q_24135127.html
http://answers.yahoo.com/question/index?qid=20060703000208AAvsSaN

And more helpful information from a .NET perspective (sometimes you learn more from that than by just looking at sample code)
http://www.developerfusion.com/article/84338/making-usb-c-friendly/
http://social.msdn.microsoft.com/Search/en-GB/?Refinement=126&Query=how+to+detect+usb+device

To deal with the AVs, just enclose your usb related code in a try except block. Try to resist the urge to use the throwing of an exception as an indicator of the device being removed !
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Author Closing Comment

by:HLyder
ID: 35074986
Both responses where usefull, but first-come first serve
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LVL 25

Expert Comment

by:epasquier
ID: 35080152
HLyder, actually you can select multiple answers and share points as you wish, no need to be binary
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