How to work with Virtual Printer using C#


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Examples

 

1. Sample Client application used for testing and development purposes. This application demonstrates how to use an INI file to write print job information and paths to the generated files.

Download Sample Client Application: Virtual Printer for C#

 

2. Print Previewer – a sample application demonstrating the features of the virtual printer. Print Previewer, which may be used in custom client applications, provides detailed information about printed files and displays the EMF files inside a form. The sample contains code that outputs the metafile to the screen.

Download Print Previewer: Virtual Printer for C#

 

3. Collecting Multiple Documents – in this example we’ll create a more powerful client which will be able to collect files from multiple printed documents into collection and transfer
them in a zip archive to a remote machine using ftp or http protocols.

Download Collecting Multiple Documents: Virtual Printer for C#/C++, VB6/VB.NET

 

4. How to print files programmatically using the ShellExecute function– see below.

 

How to print files programmatically using the ShellExecute function

The code sample below demonstrates how to print files programmatically on either a physical or a virtual printer using the ShellExecute function. It also demonstrates how to change the default system printer.

[DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool GetDefaultPrinter(StringBuilder szPrinter, ref int bufferSize);

[DllImport("winspool.drv", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool SetDefaultPrinter(string szPrinter);

void PrintDocumentUsingShellExecute (string  szPrinter, string DocumentPath)
{
    StringBuilder szDefaultPrinter = new StringBuilder(256);
    int bufferSize = szDefaultPrinter.Capacity;

    ////get the default printer
    GetDefaultPrinter(szDefaultPrinter, ref bufferSize);

    //// change the default printer
    if (String.Compare(szPrinter, szDefaultPrinter.ToString(), true) != 0)
    {
        SetDefaultPrinter(szPrinter);
    }

    //// send the document  to the print
    Process printProcess = new Process();
    printProcess.StartInfo.FileName = myDocument;
    printProcess.StartInfo.Verb = "Print";
    printProcess.StartInfo.CreateNoWindow = true;
    printProcess.Start();

    //// set default printer back to original
    if (String.Compare(szPrinter, szDefaultPrinter, true) != 0)
    {
        SetDefaultPrinter(szDefaultPrinter);
    }
}

Then it’s necessary to call these functions with the required parameters. For example, you can print MS Word and PDF documents this way:

PrintDocumentUsingShellExecute("Your Virtual Printer", "c:\Documents\AnyDocument.doc")
PrintDocumentUsingShellExecute("Your Virtual Printer", "c:\ Documents \AnyDocument.pdf")

 


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