GdPicture.NET Reference Guide
BarcodeQRReaderClear Method (GdPictureImaging)
Example 





GdPicture14 Namespace > GdPictureImaging Class : BarcodeQRReaderClear Method
Releases from memory all information about latest QR barcode detection.
Syntax
'Declaration
 
Public Sub BarcodeQRReaderClear() 
public void BarcodeQRReaderClear()
public procedure BarcodeQRReaderClear(); 
public function BarcodeQRReaderClear();
public: void BarcodeQRReaderClear(); 
public:
void BarcodeQRReaderClear(); 
Remarks

This method is used in the "Barcode Recognition" Demo.

Example
Detecting all QR barcodes in an image and then releasing the QR barcode information.
Dim oGdPictureImaging As New GdPicture.GdPictureImaging
Dim ImageID As Integer = oGdPictureImaging.CreateGdPictureImageFromFile("") 'Prompt the user to select an image
If imageId <> 0 Then
   If oGdPictureImaging.BarcodeQRReaderDoScan(ImageID) = GdPictureStatus.OK Then
      'Start QR barcode scanning process
      Dim BarcodeCount As Integer = oGdPictureImaging.BarcodeQRReaderGetBarcodeCount
      If BarcodeCount > 0 Then
         For i As Integer = 1 To BarcodeCount
            MessageBox.show("Barcode No: " & Str(i))
            MessageBox.show("Value: " & oGdPictureImaging.BarcodeQRReaderGetBarcodeValue(i))
         Next
         Dim X1, X2, X3, X4, Y1, Y2, Y3, Y4 As Integer
         'LeftArea, TopArea are coordinates used by SetROI()
         For i = 1 To oGdPictureImaging.BarcodeQRReaderGetBarcodeCount
            X1 = oGdPictureImaging.BarcodeQRReaderGetBarcodeX1(i) + LeftArea
            X2 = oGdPictureImaging.BarcodeQRReaderGetBarcodeX2(i) + LeftArea
            X3 = oGdPictureImaging.BarcodeQRReaderGetBarcodeX3(i) + LeftArea
            X4 = oGdPictureImaging.BarcodeQRReaderGetBarcodeX4(i) + LeftArea
            Y1 = oGdPictureImaging.BarcodeQRReaderGetBarcodeY1(i) + TopArea
            Y2 = oGdPictureImaging.BarcodeQRReaderGetBarcodeY2(i) + TopArea
            Y3 = oGdPictureImaging.BarcodeQRReaderGetBarcodeY3(i) + TopArea
            Y4 = oGdPictureImaging.BarcodeQRReaderGetBarcodeY4(i) + TopArea
            oGdPictureImaging.DrawLine(ImageID, X1, Y1, X2, Y2, 1, Color.Red, True)
            oGdPictureImaging.DrawLine(ImageID, X2, Y2, X3, Y3, 1, Color.Red, True)
            oGdPictureImaging.DrawLine(ImageID, X3, Y3, X4, Y4, 1, Color.Red, True)
            oGdPictureImaging.DrawLine(ImageID, X4, Y4, X1, Y1, 1, Color.Red, True)
         Next
      Else
         MessageBox.show("No barcode detected !")
      End If
      oGdPictureImaging.BarcodeQRReaderClear() 'Release detection info from memory
   End If
   oGdPictureImaging.ReleaseGdPictureImage(ImageID)
End If
See Also

Reference

GdPictureImaging Class
GdPictureImaging Members