PatchCodeReaderDoScan Method (GdPictureImaging)

In This Topic

Starts a Patch Code recognition process on a specified GdPicture image or on an area of a specified GdPicture image defined by the GdPictureImaging.SetROI method.

Syntax

Visual Basic
C#
Delphi
JScript
Managed Extensions for C++
C++/CLI

'Declaration
 
Public Function PatchCodeReaderDoScan( _
   ByVal ImageID As Integer _
) As GdPictureStatus

public GdPictureStatus PatchCodeReaderDoScan( 
   int ImageID
)

public function PatchCodeReaderDoScan( 
    ImageID: Integer
): GdPictureStatus;

public function PatchCodeReaderDoScan( 
   ImageID : int
) : GdPictureStatus;

public: GdPictureStatus PatchCodeReaderDoScan( 
   int ImageID
)

public:
GdPictureStatus PatchCodeReaderDoScan( 
   int ImageID
)

Parameters

ImageID: A unique image identifier of the GdPicture image representing the image in use.

Return Value

A member of the GdPictureStatus enumeration. If the method has been successfully followed, then the return value is GdPictureStatus.OK. We strongly recommend always checking this status first.

Remarks

For more details, please refer to our Barcode Recognition Sample included in the installation folder that demonstrates the usage of this method.

This method requires the Barcode Reading & Writing component to run.

Example

Finding patch codes in an image and writing complete barcodes info into a file.

using (GdPictureImaging gdpictureImaging = new GdPictureImaging())
{
    int imageID = gdpictureImaging.CreateGdPictureImageFromFile("image.jpg", false);
 
    // Start the patch codes scanning process and write complete information into a text file.
    gdpictureImaging.PatchCodeReaderDoScan(imageID);
 
    using (System.IO.StreamWriter file = new System.IO.StreamWriter("patch codes.txt"))
    {
        int patch codesFound = gdpictureImaging.PatchCodeReaderGetCodeCount();
 
        for (int i = 1; i <= patch codesFound; i++)
        {
            // Patch codes type, possible values are 1, 2, 4, 8, 16 or 32.
            PatchCodeType type = gdpictureImaging.PatchCodeReaderGetCodeType(i);
            file.WriteLine("Patch code type = " + type.ToString());
 
            // The patch code position, given by the coordinates of the corners.
            file.WriteLine("Position =  Top-Left=["
                + gdpictureImaging.PatchCodeReaderGetCodeX1(i) + ", " + gdpictureImaging.PatchCodeReaderGetCodeY1(i)
                + "] Top-Right=[" + gdpictureImaging.PatchCodeReaderGetCodeX2(i) + ", " + gdpictureImaging.PatchCodeReaderGetCodeY2(i)
                + "] Bottom-Right=[" + gdpictureImaging.PatchCodeReaderGetCodeX3(i) + ", " + gdpictureImaging.PatchCodeReaderGetCodeY3(i)
                + "] Bottom-Left=[" + gdpictureImaging.PatchCodeReaderGetCodeX3(i) + ", " + gdpictureImaging.PatchCodeReaderGetCodeY4(i) + "]");
        }
    }
 
    // Release used resources.
    gdpictureImaging.PatchCodeReaderClear();
    gdpictureImaging.ReleaseGdPictureImage(imageID);
}

Reference

GdPictureImaging Class
GdPictureImaging Members
SetROI Method