private void PrintFormat(object sender, DoWorkEventArgs e)
{
Dictionary <int, string> formatVars = GetFormatVariables();
try {
OpenConnection();
ZebraPrinter printer = ZebraPrinterFactory.GetInstance(printerConnection);
string statusMessage = GetPrinterStatus(printer.GetCurrentStatus());
if (statusMessage != null)
{
errorMessage = "Printer Error: " + statusMessage + ". Please check your printer and try again.";
}
else
{
if (!lastFormatOpenedSource.Equals(FORMAT_SOURCE_PRINTER))
{
printerConnection.Write(Encoding.UTF8.GetBytes(lastFormatOpenedContents));
}
printer.PrintStoredFormat(lastFormatOpened, formatVars, "UTF-8");
statusMessage = GetPrinterStatus(printer.GetCurrentStatus());
if (statusMessage != null)
{
errorMessage = "Printer Error after Printing: " + statusMessage + ". Please check your printer.";
}
}
} catch (ConnectionException error) {
errorMessage = "Connection Error: " + error.Message;
} finally {
CloseConnection();
}
}
/*
* Print the labels using the supplied data using the zebra API
*/
private void PrintLabels(LabelSetup l)
{
//Define the label format used to layout the label
string labelFormat =
$"^XA" + // Start the format
$"^DFE:LABEL.ZPL^FS" + // Set the name of the format file
$"^PW{l.pagewidth}" + // Set the pagewidth
$"^A@N,{l.fontsize},E:TT0003M_.FNT" + // Set the font and fontsize
$"^FO0,{l.offset}" + // Set the starting position using the offset
$"^FB{l.pagewidth},2,0,C" + // Create a field block to center the text, max 2 lines
$"^FN1\"Batch Code Text\"^FS" + // Define the label text into variable slot 1
$"^XZ"; // End the format
//Send the label format to the printer
printer.SendCommand(labelFormat);
//Initialise a dictionary to pass variables to the printer
Dictionary <int, string> vars = new Dictionary <int, string> {
};
//Print each label individually, providing a string for the label text via the dictionary
for (int i = 0; i < l.quantity; i++)
{
if (cancel)
{
break;
}
//Change the text based on the size of the label
if (l.pagewidth < 200)
{
vars[1] = $"{l.batchcode}\\&";
vars[1] += $"{l.prefix}{l.startNumber + i}\\&";
}
else
{
vars[1] = $"{l.batchcode}\\&";
vars[1] += $"Bottle: {l.prefix}{l.startNumber + i}\\&";
}
//Print the label with associated text
printer.PrintStoredFormat("E:LABEL.ZPL", vars);
}
}
/* "E:T4FORM4.ZPL" Item Template
* --------------------------------------------
* Index|CharLimit|FieldName | Example
* 1 | 8 |"Item Count" |"100/100"
* 2 | 10 |"Service" |"GrubHub"
* 3 | 20 |"Customer Name" |
* 4 | 15 |"Label Name" |
* 5 | 40 |"Item Name" |
* 6 | 5 |"Size" |"Large"
* 7 | 3 |"Temperature" |"Hot"
* 8 | 6 |"Ice Level" |"80% I"
* 9 | 6 |"Sugar Level" |"50% S"
* 10 | 14 |"Milk Subsitution"|"Whole Milk Sub"
* 11 | 40 |"Toppings" |"Pearls, Pudding,"
* 12 | 48 |"Special Instructions1"
* 13 | 48 |"Special Instructions2"
*/
public static bool PrintOrder(OrderContainer orderCon)
{
string[][] items = orderCon.OrderArray;
bool printStatus = true;
Debug.WriteLine("START: PrintOrder()");
try {
if (printerConn == null)
{
//Get the connection to the printer driver
printerConn = FindConnection();
if (printerConn == null)
{
orderCon.PrintStatus = "Error: Printer not detected";
Debug.WriteLine("Error: Printer not detected");
return(false);
}
}
//We try to open the connection
try {
printerConn.Open();
} catch (Exception e) {
Debug.WriteLine("Error: Cannot open connection" + e.Message);
orderCon.PrintStatus = "Error: Cannot open connection";
return(false);
}
//The connection is open, so we get the instance of the printer and try to print
try {
ZebraPrinter printer = ZebraPrinterFactory.GetInstance(PrinterLanguage.ZPL, printerConn);
Debug.WriteLine("PrinterOrder() - got printer instance");
for (int i = items.Length - 1; i > -1; i--)
{
printer.PrintStoredFormat(PrintTemplatePath, items[i]);
}
}catch (Exception e) {
Debug.WriteLine("Error: " + e.Message);
try {
//We check the status of the printer to see why it failed, which takes a long time without a UsbStatus channel
//which is why we only check if printing fails
string status = CheckPrinterStatus(printerConn);
if (status != "true")
{
Debug.WriteLine(status);
orderCon.PrintStatus = status;
return(false);
}
}catch (Exception e2) {
Debug.WriteLine("Error: " + e2.Message);
orderCon.PrintStatus = "Error: Connection error";
return(false);
}
}finally {
printerConn.Close();
}
} catch (ConnectionException e) {
Debug.WriteLine($"Error discovering local printers: {e.Message}");
orderCon.PrintStatus = "Error: Can't discover local printers";
printStatus = false;
}
return(printStatus);
}