/// <summary>
/// What to do when the selection changes in the QR Code site list:
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void cmboExportSiteQR_SelectedIndexChanged(object sender, EventArgs e)
{
// Asbestos underpants:
try
{
// Get the current selection of the combo box and make sure it
// isn't empty:
String site = (string)cmboExportSiteQR.Text;
if (!String.IsNullOrEmpty(site))
{
// Ask the main form to give us the site parameters for this site.
// Since the main form has all the code to do this, we'll ask it
// to do the dirty work.
SiteParameters siteParams = caller.GetSiteParamsForQRCode(site);
// Now we'll generate the text we'll embed into the QR Code. We want
// this to be as compact as we can get it, so our "headings" will be
// single letters. We'll start off with an identifying header so the
// QR Code reader will know the format of our string. We delimite the
// string with pipes, which aren't allowed in any of our fields. We
// want this to match as closely to the values of the XML export file
// for consistency. That means the hash engine and the character
// limit fields will need some tweaking.
StringBuilder sb = new StringBuilder();
sb.Append("CRYPTNOSv1|" +
"S:" + siteParams.Site + "|" +
"H:" + HashEngine.HashEnumStringToDisplayHash(siteParams.Hash) + "|" +
"I:" + siteParams.Iterations.ToString() + "|" +
"C:" + siteParams.CharTypes.ToString() + "|L:");
if (siteParams.CharLimit < 0) sb.Append("0");
else sb.Append(siteParams.CharLimit.ToString());
// Now that we've built our string, use the QRCodeWriter from ZXing to
// build the QR Code image and assign the bitmap to the picture box:
byteMatrix = qrCodeWriter.encode(sb.ToString(),
BarcodeFormat.QR_CODE, 200, 200);
pictureBox1.Image = byteMatrix.ToBitmap();
}
// If the selection in the combo box wasn't useful, empty the picture box:
else pictureBox1.Image = null;
}
// Similarly, if anything blew up, empty the picture box:
catch { pictureBox1.Image = null; }
}