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Help to invoke request to parallel port (IOCTL_PAR_QUERY_DEVICE_ID)

Posted on 2005-04-21
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Last Modified: 2012-06-21
Hello everybody,

I have a problem making an I/O request to the parallel port (LPT1).

I write a small tool, where I want to get information about device connected to the parallel port (model name).
Currently I open the device using
CreateFile("LPT1",...);
and pass obtained handle to the DeviceIoControl()

DeviceIoControl(hLPT, IOCTL_PAR_QUERY_DEVICE_ID,...);

This call fails with "Incorrect function" error.
I have tried to make first IOCTL_PAR_QUERY_DEVIEC_ID_SIZE request, but the result is the same :((((

Did anybody do such thing with parallel port?

Your help is greatly apreciated!

Thank you.
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Question by:Rothmans
8 Comments
 
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Expert Comment

by:jkr
ID: 13836809
You can only use that very IOCTL in a device driver, not a user mode program.
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Author Comment

by:Rothmans
ID: 13856631
Do you mean, that this only particular IOCTL (namely IOCTL_PAR_QUERY_DEVICE_ID) is allowed to use only from kernel mode?
I saw some samples in internet, where this exactly request was made from user mode (normal application) along with other IOCTL requests.
Could you be wrong?
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LVL 86

Expert Comment

by:jkr
ID: 13860802
I could be wrong, but then, why would MS put the declaration only in ntddpar.h (which is part of the DDK, and not the PSDK)?
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Author Comment

by:Rothmans
ID: 13864578
I actually suspect right now, that I am using incorrect device name in the CreateFile. "LPT1" could probably mean the port itself, although the call to CreateFile with "LPT1.4" as device name returns the same handle (numerical value).
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Author Comment

by:Rothmans
ID: 13864613
The device is actually a laser printer.
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Author Comment

by:Rothmans
ID: 13865447
Yes, jkr,
you are definetly wrong.
Now it works, thank's God.
The problem was in the device name.
Instead of "LPT1" I must use "\\.\LPT1.4".
My tool still works in common user mode.
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by:Wayne Barron
ID: 15717156
No comment has been added to this question in more than 21 days, so it is now classified as abandoned..
I will leave the following recommendation for this question in the Cleanup topic area:
[PAQ - Refund]

Any objections should be posted here in the next 4 days. After that time, the question will be closed.

Carrzkiss
EE Cleanup Volunteer
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