public async void ProcessRequest()
{
//Get data for rendering process...
string lstPrinterDpi = _ctx.Request.Form["lstPrinterDpi"];
string txtLabelWidth = _ctx.Request.Form["txtLabelWidth"];
string txtLabelHeight = _ctx.Request.Form["txtLabelHeight"];
string cpRibbonColor = _ctx.Request.Form["cpRibbonColor"];
string cpBackColor = _ctx.Request.Form["cpBackColor"];
string lstOutputFormat = _ctx.Request.Form["lstOutputFormat"];
string lstOutputRotate = _ctx.Request.Form["lstOutputRotate"];
string zplCommands = _ctx.Request.Form["zplCommands"];
var json = new StringBuilder();
json.Append("{");
try
{
if (string.IsNullOrEmpty(zplCommands))
{
throw new ArgumentException("Please specify some ZPL commands.");
}
//Create an instance of ZPLPrinter class
using (var zplPrinter = new ZPLPrinter("LICENSE OWNER", "LICENSE KEY"))
{
//Set printer DPI
//The DPI value to be set must match the value for which
//the ZPL commands to be processed were created!!!
zplPrinter.Dpi = float.Parse(lstPrinterDpi.Substring(0, 3));
//Apply antialiasing?
zplPrinter.AntiAlias = (_ctx.Request.Form["chkAntialias"].Count > 0);
//set label size
zplPrinter.LabelWidth = float.Parse(txtLabelWidth) * zplPrinter.Dpi;
if (zplPrinter.LabelWidth <= 0)
{
zplPrinter.LabelWidth = 4;
}
zplPrinter.ForceLabelWidth = (_ctx.Request.Form["chkForceLabelWidth"].Count > 0);
zplPrinter.LabelHeight = float.Parse(txtLabelHeight) * zplPrinter.Dpi;
if (zplPrinter.LabelHeight <= 0)
{
zplPrinter.LabelHeight = 6;
}
zplPrinter.ForceLabelHeight = (_ctx.Request.Form["chkForceLabelHeight"].Count > 0);
//Set Label BackColor
zplPrinter.LabelBackColor = cpBackColor;
//Set Ribbon Color
zplPrinter.RibbonColor = cpRibbonColor;
//Set image or doc format for output rendering
zplPrinter.RenderOutputFormat = (RenderOutputFormat)Enum.Parse(typeof(RenderOutputFormat), lstOutputFormat);
//Set rotation for output rendering
zplPrinter.RenderOutputRotation = (RenderOutputRotation)Enum.Parse(typeof(RenderOutputRotation), lstOutputRotate);
//Set text encoding
Encoding enc = (_ctx.Request.Form["chkUTF8"].Count > 0 ? Encoding.UTF8 : Encoding.GetEncoding(850));
var buffer = zplPrinter.ProcessCommands(zplCommands, enc);
// the buffer variable contains the binary output of the ZPL rendering result
// The format of this buffer depends on the RenderOutputFormat property setting
if (buffer != null && buffer.Count > 0)
{
if (zplPrinter.RenderOutputFormat == RenderOutputFormat.PNG ||
zplPrinter.RenderOutputFormat == RenderOutputFormat.JPG)
{
json.Append("\"labelImages\":[");
for (int i = 0; i < buffer.Count; i++)
{
json.Append($"\"data:image/{zplPrinter.RenderOutputFormat.ToString().ToLower()};base64,{Convert.ToBase64String(buffer[i])}\"");
if (i < buffer.Count - 1)
{
json.Append(",");
}
}
json.Append("]");
}
else if (zplPrinter.RenderOutputFormat == RenderOutputFormat.PDF)
{
json.Append($"\"labelPDF\":\"data:application/pdf;base64,{Convert.ToBase64String(buffer[0])}\"");
}
else if (zplPrinter.RenderOutputFormat == RenderOutputFormat.PCX)
{
//If there're more than one file, then zip them...
if (buffer.Count > 1)
{
using (var outStream = new MemoryStream())
{
using (var archive = new ZipArchive(outStream, ZipArchiveMode.Create, true))
{
for (int i = 0; i < buffer.Count; i++)
{
var fileInArchive = archive.CreateEntry($"Label{i.ToString()}.pcx", CompressionLevel.Optimal);
using (var entryStream = fileInArchive.Open())
using (var fileToCompressStream = new MemoryStream(buffer[i]))
{
fileToCompressStream.CopyTo(entryStream);
}
}
}
json.Append($"\"labelPCX\":\"data:application/zip;base64,{Convert.ToBase64String(outStream.ToArray())}\"");
}
}
else
{
json.Append($"\"labelPCX\":\"data:image/pcx;base64,{Convert.ToBase64String(buffer[0])}\"");
}
}
}
else
{
throw new ArgumentException("No output available for the specified ZPL commands.");
}
}
}
catch (Exception ex)
{
json.Append("\"error\":");
json.Append($"\"{HttpUtility.JavaScriptStringEncode(ex.Message)}\"");
}
json.Append("}");
_ctx.Response.ContentType = "application/json";
await _ctx.Response.WriteAsync(json.ToString());
}
