Printing Implementation

As with other additional interfaces, the EAManagement will indicate whether the plugin includes the printer interface before it can be accessed.

Step 1

Check if service is a part of the EAManagement object:

Copy 
public void LoadPrintService()
{
    if(this.printerService == null && this.eaManagement is IPrinter)
    {
        this.printerService = ((IPrinter)this.eaManagement).GetPrinterService();
  this.printerService.PrintingEvent += OnPrintEvent;
    }
}

Step 2

Check if the service needs to upload a font for the printing process.
Note: For Android specific code: upload the font to memory and send the full path to the print service.

Copy 
private void InitializeFontSelection()
{
  string fontFamily = this.printerService.GetFontFamily();

  if (fontFamily.Length > 0)
  {
      fontFamily = "Font/" + fontFamily;
      string absoluteFontPath = ExtractFont(fontFamily);
      this.printerService.SetAbsolutePath(absoluteFontPath);
  }
}

Step 3

A receipt can now be sent to the printer and will receive event updates.

In the end a line feed command is sent to the printer.

Copy 
if (this.printerService != null)
{
    var connected = await this.printerService.OpenPrinterConnection();
    
    if (connected)
    {
        return await this.printerService.LineFeed();
    }
}

See also

LS Pay - EAManagement