public void PatchCodeReaderClear()

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);
}