// initialization
private void OnLoad(object sender, EventArgs e)
{
// program title
Text = "Pdf417DecoderDemo - " + Pdf417Decoder.VersionNumber + " \u00a9 2019 Uzi Granot. All rights reserved.";
#if DEBUG
// current directory
string CurDir = Environment.CurrentDirectory;
string WorkDir = CurDir.Replace("bin\\Debug", "Work");
if (WorkDir != CurDir && Directory.Exists(WorkDir))
{
Environment.CurrentDirectory = WorkDir;
}
// open trace file
Pdf417Trace.Open("Pdf417DecoderTrace.txt");
Pdf417Trace.Write("Pdf417DecoderDemo");
#endif
// create decoder
Pdf417Decoder = new Pdf417Decoder();
// resize window
OnResize(sender, e);
return;
}
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;
}
/// <summary>
/// Program initialization
/// </summary>
/// <param name="sender">Sender</param>
/// <param name="e">Event arguments</param>
private void OnLoad(object sender, EventArgs e)
{
// program title
Text = "Pdf417VideoDecoder - " + Pdf417Decoder.VersionNumber + " \u00a9 2019 Uzi Granot. All rights reserved.";
#if DEBUG
// current directory
string CurDir = Environment.CurrentDirectory;
string WorkDir = CurDir.Replace("bin\\Debug", "Work");
if (WorkDir != CurDir && Directory.Exists(WorkDir))
{
Environment.CurrentDirectory = WorkDir;
}
// open trace file
Pdf417Trace.Open("Pdf417VideoDecoderTrace.txt");
Pdf417Trace.Write(Text);
#endif
// disable reset button
ResetButton.Enabled = false;
GoToUriButton.Enabled = false;
// get an array of web camera devices
DsDevice[] CameraDevices = DsDevice.GetDevicesOfCat(FilterCategory.VideoInputDevice);
// make sure at least one is available
if (CameraDevices == null || CameraDevices.Length == 0)
{
MessageBox.Show("No video cameras in this computer");
Close();
return;
}
// select the first camera
DsDevice CameraDevice = CameraDevices[0];
// Device moniker
IMoniker CameraMoniker = CameraDevice.Moniker;
// get a list of frame sizes available
FrameSize[] FrameSizes = Camera.GetFrameSizeList(CameraMoniker);
// make sure there is at least one frame size
if (FrameSizes == null || FrameSizes.Length == 0)
{
MessageBox.Show("No video cameras in this computer");
Close();
return;
}
// test if our frame size is available
int Index;
for (Index = 0; Index < FrameSizes.Length &&
(FrameSizes[Index].Width != FrameSize.Width || FrameSizes[Index].Height != FrameSize.Height); Index++)
{
;
}
// select first frame size
if (Index == FrameSizes.Length)
{
FrameSize = FrameSizes[0];
}
// Set selected camera to camera control with default frame size
// Create camera object
VideoCamera = new Camera(PreviewPanel, CameraMoniker, FrameSize);
// create QR code decoder
Decoder = new Pdf417Decoder();
// resize window
OnResize(sender, e);
// create timer
VideoDecoderTimer = new Timer();
VideoDecoderTimer.Interval = 200;
VideoDecoderTimer.Tick += VideoDecoderTimer_Tick;
VideoDecoderTimer.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;
}
