PDF Print Through Windows Service with C#

Question

I'm using this code to print a PDF file on a local printer with C# within a windows service.

Process process = new Process();
PrinterSettings printerSettings = new PrinterSettings();

if (!string.IsNullOrWhiteSpace(basePrint))
   printerSettings.PrinterName = basePrint;

process.StartInfo.FileName = fileName;
process.StartInfo.Verb = "printto";
process.StartInfo.Arguments = "\"" + printerSettings.PrinterName + "\"";
process.Start();
process.WaitForInputIdle();

Everything works fine when I set a user to run the windows service.

Whenever I run this code under the LocalSystem credential, I get the error "there are no application associated to this operation" which usually indicates that I don't have a program ready to deal with a print operation of a file with the .pdf extension.

My problem is that I do have the program (Foxit Reader) to deal with this operation as confirmed by the fact that this code works with specific user set on the service and that I'm able to send files to the printer by right clicking them and selecting the print option.

Is there anything I can change to be able to print on a local printer from within a service without an specific user?

Answer 1

I ended up using pdfium to do the job. With that code, the PDF file is sent to the printer correctly even when the windows service is running under the LocalService user.

PrinterSettings printerSettings = new PrinterSettings()
{
    PrinterName = printerName,
    Copies = 1
};

PageSettings pageSettings = new PageSettings(printerSettings)
{
    Margins = new Margins(0, 0, 0, 0)
};

foreach (PaperSize paperSize in printerSettings.PaperSizes)
{
    if (paperSize.PaperName == "A4")
    {
        pageSettings.PaperSize = paperSize;
        break;
    }
}

using (PdfDocument pdfDocument = PdfDocument.Load(filePath))
{
    using (PrintDocument printDocument = pdfDocument.CreatePrintDocument())
    {
        printDocument.PrinterSettings = printerSettings;
        printDocument.DefaultPageSettings = pageSettings;
        printDocument.PrintController = (PrintController) new     StandardPrintController();
        printDocument.Print();
    }
}

Thanks for the answers guys.