private void StartAsyncTask(object state)
{
try
{
// We want to respond to image requests of the form;
//
// <encoded barcode>.Barcode
// Cache information from context
_request = _context.Request;
_response = _context.Response;
// Filename is the encoded design ID
BarcodeImageUri uri = new BarcodeImageUri(_request.Url);
// Lookup design and retrieve image data
// Stream JPEG image to client
_response.ContentType = "image/jpeg";
_response.Clear();
_response.BufferOutput = true;
// Get the object capable of rendering the barcode
BarcodeDraw drawObject = BarcodeDrawFactory.GetSymbology(
uri.EncodingScheme);
// Render barcode and save directly onto response stream
using (Image image = drawObject.Draw(uri.Text,
uri.BarMinHeight, uri.BarMaxHeight,
uri.BarMinWidth, uri.BarMaxWidth))
{
image.Save(_response.OutputStream, ImageFormat.Jpeg);
}
}
catch (Exception e)
{
_error = e;
}
finally
{
_response.End();
SetComplete();
}
}
private void StartAsyncTask(object state)
{
try
{
// We want to respond to image requests of the form;
//
// <encoded barcode>.Barcode
// Cache information from context
_request = _context.Request;
_response = _context.Response;
// Filename is the encoded design ID
BarcodeImageUri uri = new BarcodeImageUri(_request.Url);
// Lookup design and retrieve image data
// Stream JPEG image to client
_response.ContentType = "image/jpeg";
_response.Clear();
_response.BufferOutput = true;
// Get the object capable of rendering the barcode
BarcodeDraw drawObject = BarcodeDrawFactory.GetSymbology(
uri.EncodingScheme);
// Render barcode and save directly onto response stream
using (Image image = drawObject.Draw(uri.Text,
uri.BarMinHeight, uri.BarMaxHeight,
uri.BarMinWidth, uri.BarMaxWidth))
{
image.Save(_response.OutputStream, ImageFormat.Jpeg);
}
}
catch (Exception e)
{
_error = e;
}
finally
{
_response.End();
SetComplete();
}
}
private void StartAsyncTask(object state)
{
try
{
// We want to respond to image requests of the form;
//
// <encoded barcode>.Barcode
// Cache information from context
_request = _context.Request;
_response = _context.Response;
// Filename is the encoded design ID
BarcodeImageUri uri = new BarcodeImageUri(_request.Url);
// Lookup design and retrieve image data
// Stream JPEG image to client
_response.ContentType = "image/jpeg";
_response.Clear();
_response.BufferOutput = true;
// Get the object capable of rendering the barcode
BarcodeDraw drawObject =
BarcodeDrawFactory.GetSymbology(uri.EncodingScheme);
BarcodeMetrics metrics = drawObject.GetDefaultMetrics(30);
metrics.Scale = uri.Scale;
BarcodeMetrics1d metrics1d = metrics as BarcodeMetrics1d;
if (metrics1d != null)
{
metrics1d.MaxHeight = uri.BarMaxHeight;
metrics1d.MinHeight = uri.BarMinHeight;
metrics1d.MaxWidth = uri.BarMaxWidth;
metrics1d.MinWidth = uri.BarMinWidth;
}
else if (uri.EncodingScheme == BarcodeSymbology.CodeQr)
{
BarcodeMetricsQr qrMetrics = (BarcodeMetricsQr)metrics;
qrMetrics.EncodeMode = uri.QrEncodingMode;
qrMetrics.ErrorCorrection = uri.QrErrorCorrect;
qrMetrics.Version = uri.QrVersion;
}
// Render barcode and save directly onto response stream
MemoryStream imageStream = new MemoryStream();
using (Image image = drawObject.Draw(uri.Text, metrics))
{
// Save to temporary stream because image tried to seek
// during the write operation
image.Save(imageStream, ImageFormat.Jpeg);
// Move to start of the stream
imageStream.Seek(0, SeekOrigin.Begin);
// Do synchronous copy to response output stream
int blockSize = 1024;
byte[] buffer = new byte[blockSize];
while (true)
{
int bytesRead = imageStream.Read(buffer, 0, blockSize);
if (bytesRead == 0)
{
break;
}
_response.OutputStream.Write(buffer, 0, bytesRead);
}
}
}
catch (Exception e)
{
_error = e;
}
finally
{
_response.End();
SetComplete();
}
}
private void StartAsyncTask(object state)
{
try
{
// We want to respond to image requests of the form;
//
// <encoded barcode>.Barcode
// Cache information from context
_request = _context.Request;
_response = _context.Response;
// Filename is the encoded design ID
BarcodeImageUri uri = new BarcodeImageUri(_request.Url);
// Lookup design and retrieve image data
// Stream JPEG image to client
_response.ContentType = "image/jpeg";
_response.Clear();
_response.BufferOutput = true;
// Get the object capable of rendering the barcode
BarcodeDraw drawObject =
BarcodeDrawFactory.GetSymbology(uri.EncodingScheme);
BarcodeMetrics metrics = drawObject.GetDefaultMetrics(30);
metrics.Scale = uri.Scale;
BarcodeMetrics1d metrics1d = metrics as BarcodeMetrics1d;
if (metrics1d != null)
{
metrics1d.MaxHeight = uri.BarMaxHeight;
metrics1d.MinHeight = uri.BarMinHeight;
metrics1d.MaxWidth = uri.BarMaxWidth;
metrics1d.MinWidth = uri.BarMinWidth;
}
else if (uri.EncodingScheme == BarcodeSymbology.CodeQr)
{
BarcodeMetricsQr qrMetrics = (BarcodeMetricsQr)metrics;
qrMetrics.EncodeMode = uri.QrEncodingMode;
qrMetrics.ErrorCorrection = uri.QrErrorCorrect;
qrMetrics.Version = uri.QrVersion;
}
// Render barcode and save directly onto response stream
MemoryStream imageStream = new MemoryStream();
using (Image image = drawObject.Draw(uri.Text, metrics))
{
// Save to temporary stream because image tried to seek
// during the write operation
image.Save(imageStream, ImageFormat.Jpeg);
// Move to start of the stream
imageStream.Seek(0, SeekOrigin.Begin);
// Do synchronous copy to response output stream
int blockSize = 1024;
byte[] buffer = new byte[blockSize];
while (true)
{
int bytesRead = imageStream.Read(buffer, 0, blockSize);
if (bytesRead == 0)
{
break;
}
_response.OutputStream.Write(buffer, 0, bytesRead);
}
}
}
catch (Exception e)
{
_error = e;
}
finally
{
_response.End();
SetComplete();
}
}
