/// <summary>
/// Parse QueryString that define the QR code properties
/// </summary>
/// <param name="request">HttpRequest containing HTTP GET data</param>
/// <returns>A QR code descriptor object</returns>
public static CodeDescriptor Init(HttpRequest request)
{
var cp = new CodeDescriptor();
// Error correction level
if (!Enum.TryParse(request.QueryString["e"], out cp.Ecl))
{
cp.Ecl = ErrorCorrectionLevel.M;
}
// Code content to encode
cp.Content = request.QueryString["t"];
// Size of the quiet zone
if (!Enum.TryParse(request.QueryString["q"], out cp.QuietZones))
{
cp.QuietZones = QuietZoneModules.Two;
}
// Module size
if (!int.TryParse(request.QueryString["s"], out cp.ModuleSize))
{
cp.ModuleSize = 12;
}
return(cp);
}
public void ProcessRequest(HttpContext context)
{
// Retrieve the parameters from the QueryString
var codeParams = CodeDescriptor.Init(context.Request);
// Encode the content
if (codeParams == null || !codeParams.TryEncode())
{
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
return;
}
// Render the QR code as an image
using (var ms = new MemoryStream())
{
codeParams.Render(ms);
context.Response.ContentType = codeParams.ContentType;
context.Response.OutputStream.Write(ms.GetBuffer(), 0, (int)ms.Length);
}
}