Parallel Port access in XP using DeviceIoControl

Compatible Support Forums: Parallel Port access in XP using DeviceIoControl

Page 1 of 1

You cannot start a new topic
You cannot reply to this topic

Parallel Port access in XP using DeviceIoControl

#1 Sivaraja

stranger

Group: Members
Posts: 1
Joined: 29-August 03

Posted 29 August 2003 - 08:06 AM

I am writing a simple printing application which opens the LPT1. I am using CreateFile & WriteFile calls to do this. To find out the printer status I am using DeviceIoControl API with IOCTL_PAR_QUERY_INFORMATION code . The problem I am facing is,

When ever I restart the m/c the DeviceIoControl API fails (GetLastError returns 1). Then If I go to devicemanager/ports/Port settings and make some changes and click ok, then the application starts working fine. But If restart the m/c again I have to repeat the same thing. whats the problem ???

Any help would be appriciated. I am using Windows XP

With regards,
Sivaraja T