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Printing from a Service

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Environment: Windows NT 4

The Problem

Have you ever attempted to print from a Windows NT Service?

Some time ago my colleagues and I wrote a TCP/IP server to collect data, analyze it and then print exceptions. Obviously, printing is usually a very simple and typical task for any software engineer.

When I finished developing this application, I then converted it to a Windows NT service. Everything seemed to work well with one exception. The application wouldn't print anything!

With my heart in my hands, I then began the arduous task of walking the registry and searching for a solution. Finally, I found it after a few days.

The solution

  • Locate the following registry key
  • 
    HKEY_CURRENT_USER\Software\Microsoft\WindowsNT\CurrentVersion\Windows
  • Write down the value of "Device" as you'll be using it soon
  • Locate the following registry key
  • 
    HKEY_USERS\.DEFAULT\Software\Microsoft\WindowsNT\CurrentVersion\Windows\ 
    
  • Copy the previous information into the field "Device"
  • Reboot your PC
That's it! Now you can print from a Windows NT service.

Warning!

Modifing your registry incorrectly can result in serious, system-wide problems. Therefore, use this advice at your own risk.

Acknowledgements

Thanks to my friend Maurizio Picco for his usefull help.



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