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Asked: 2026-06-03T17:30:39+00:00

I have program that sends a file to a printer using ‘lpr’ command. I

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I have program that sends a file to a printer using ‘lpr’ command.
I have installed Windows SDK 7.1. It is working fine in a 32 bit Windows 7 system but not working in 64 bit Windows 7.

            Process proc = new Process();
            proc.StartInfo.FileName = "lpr";
            proc.StartInfo.WorkingDirectory = GlobalConstants.outBaseDir;
            proc.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            proc.StartInfo.Arguments = " -S " + GlobalConstants.printerIP + " -P RAW " + filePath;
            proc.Start();

It throws an execption.

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1 Answer

  1. Editorial Team

    I finally got the answer to my question.

    Step1:
    I had to enable “LPR Port Monitor”. This can be done through “Control Panel/Programs and Features/Turn Windows features on or off”. In the dialog expand “Print and Document Services.” Check “LPR Port Monitor.”

    Step2:
    When you install Windows SDK 7.1. It will copy lpr.exe and related files into “C:\Windows\winsxs\amd64_microsoft-windows-p..ting-lprportmonitor_xxxx…”. Copy the files lpr.exe, lprhelp.dll, and lprmonui.dll into the C:\Windows\sysWOW64 folder.

    Thats it!!!

    Reference: http://www.tomshardware.com/forum/240019-44-error-windows

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