private void VideoDecoderTimer_Tick(object sender, EventArgs e)
{
VideoDecoderTimer.Enabled = false;
Bitmap Pdf417Image;
try
{
Pdf417Image = VideoCamera.SnapshotSourceImage();
// trace
#if DEBUG
Pdf417Trace.Format("Image width: {0}, Height: {1}", Pdf417Image.Width, Pdf417Image.Height);
#endif
}
catch (Exception EX)
{
DataTextBox.Text = "Decode exception.\r\n" + EX.Message;
VideoDecoderTimer.Enabled = true;
return;
}
// decode image to byte array (Pdf417Decoder.BarcodeBinaryData)
string BarcodeText = null;
// decode barcodes
int BarcodesCount = Decoder.Decode(Pdf417Image);
// dispose bitmap
Pdf417Image.Dispose();
// we have no Pdf417 barcode
if (BarcodesCount == 0)
{
VideoDecoderTimer.Enabled = true;
return;
}
// decoding was successful
// convert binary data to text string
BarcodeText = Decoder.BinaryDataToString(0);
// we have no Pdf417 barcode
if (BarcodeText == null || BarcodeText.Length == 0)
{
VideoDecoderTimer.Enabled = true;
return;
}
VideoCamera.PauseGraph();
DataTextBox.Text = BarcodeText;
ResetButton.Enabled = true;
if (IsValidUri(DataTextBox.Text))
{
GoToUriButton.Enabled = true;
}
return;
}
// user pressed load image button
private void OnLoadImage(object sender, EventArgs e)
{
// get file name to decode
OpenFileDialog Dialog = new OpenFileDialog
{
Filter = "Image Files(*.png;*.jpg;*.gif;*.tif)|*.png;*.jpg;*.gif;*.tif;*.bmp)|All files (*.*)|*.*",
Title = "Load PDF417 Barcode Image",
InitialDirectory = Directory.GetCurrentDirectory(),
RestoreDirectory = true,
FileName = string.Empty
};
// display dialog box
if (Dialog.ShowDialog() != DialogResult.OK)
{
return;
}
// display file name
int Ptr = Dialog.FileName.LastIndexOf('\\');
int Ptr1 = Dialog.FileName.LastIndexOf('\\', Ptr - 1);
ImageFileLabel.Text = Dialog.FileName.Substring(Ptr1 + 1);
// disable buttons
LoadImageButton.Enabled = false;
// dispose previous image
if (Pdf417InputImage != null)
{
Pdf417InputImage.Dispose();
}
// load image to bitmap
Pdf417InputImage = new Bitmap(Dialog.FileName);
// trace
#if DEBUG
Pdf417Trace.Format("****");
Pdf417Trace.Format("Decode image: {0} ", Dialog.FileName);
Pdf417Trace.Format("Image width: {0}, Height: {1}", Pdf417InputImage.Width, Pdf417InputImage.Height);
#endif
// decode barcodes
int BarcodesCount = Pdf417Decoder.Decode(Pdf417InputImage);
// no barcodes were found
if (BarcodesCount == 0)
{
#if DEBUG
Pdf417Trace.Format("Image has no barcodes: {0}", Dialog.FileName);
#endif
// clear barcode data text box
DataTextBox.Text = null;
MessageBox.Show(string.Format("Image has no barcodes: {0}", Dialog.FileName));
}
// one barcodes was found
else if (BarcodesCount == 1)
{
// decoding was successful
// convert binary data to text string
DataTextBox.Text = Pdf417Decoder.BinaryDataToString(0);
}
// more than one barcode
else
{
StringBuilder Str = new StringBuilder();
for (int Count = 0; Count < BarcodesCount; Count++)
{
Str.AppendFormat("Barcode No. {0}\r\n{1}\r\n", Count + 1, Pdf417Decoder.BinaryDataToString(Count));
}
DataTextBox.Text = Str.ToString();
}
// enable buttons
LoadImageButton.Enabled = true;
// force repaint
Invalidate();
return;
}
