protected override void OnMessage(MessageEventArgs e)
{
if (_printerName == null || _printerName == "")
{
this.Send("Failed. Printer is not specified.");
return;
}
if (_printerName == "DEBUG")
{
string message;
if (e.IsBinary)
{
message = "RAW DATA";
}
else
{
if (e.Data.Length <= 30)
{
message = e.Data;
}
else
{
message = e.Data.Substring(0, 30);
}
}
ServerController.LogInfo("Print Command Received: \n" + message);
this.Send("Success");
return;
}
bool opened = myPrinter.OpenPrint(_printerName, "Receipt");
if (!opened)
{
ServerController.LogWarn("Can not open printer [" + _printerName + "]. Print failed.");
this.Send("Failed");
return;
}
// send data to printer
if (e.IsBinary)
{
myPrinter.SendToPrinter(_printerName, e.RawData, e.RawData.Length);
this.Send("Success");
myPrinter.ClosePrint();
ServerController.LogInfo("Print successfully. Printer [" + _printerName + "]");
}
else
{
ServerController.LogInfo("Can not send non binary data to printer [" + _printerName + "]. Print failed.");
this.Send("Failed");
}
}
private static void ProceedPrintRequest(HttpRequestEventArgs e)
{
var printer = e.Request.QueryString.Get("printer");
var documentName = e.Request.QueryString.Get("title");
bool printerInstalled = false;
// check if user specified printer
if (printer == null)
{
Utility.ResponseWrite(e.Response, "Printer not specified");
e.Response.ContentType = "text/plain";
e.Response.StatusCode = 400;
return;
}
// check if printer installed
foreach (string installedPrinter in PrinterSettings.InstalledPrinters)
{
if (installedPrinter == printer)
{
printerInstalled = true;
break;
}
}
if (!printerInstalled)
{
Utility.ResponseWrite(e.Response, "Printer not installed: " + printer);
e.Response.ContentType = "text/plain";
e.Response.StatusCode = 400;
return;
}
// perform printing
bool opened = myPrinter.OpenPrint(printer, documentName != null ? documentName : "Receipt");
// check if printer has opened for printing
if (!opened)
{
ServerController.LogWarn("Can not open printer [" + printer + "]. Print failed.");
Utility.ResponseWrite(e.Response, "Can not open printer [" + printer + "]. Print failed.");
e.Response.ContentType = "text/plain";
e.Response.StatusCode = 500;
return;
}
if (!e.Request.HasEntityBody)
{
Utility.ResponseWrite(e.Response, "Invalid raw printing data.");
e.Response.ContentType = "text/plain";
e.Response.StatusCode = 400;
return;
}
// get data and send to printer. then close print job
byte[] data = Utility.GetRequestPostDataAsBytes(e.Request);
myPrinter.SendToPrinter(printer, data, data.Length);
myPrinter.ClosePrint();
// response with success
Utility.ResponseWrite(e.Response, "Print job has been sent to printer successfully!");
e.Response.ContentType = "text/plain";
e.Response.StatusCode = 200;
e.Response.Close();
return;
}
