GetTextLineValue Method (GdPictureOCR)

In This Topic

Gets the value of the specified line, that is a part of a specified OCR result.

Syntax

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

'Declaration
 
Public Function GetTextLineValue( _
   ByVal OCRResultID As String, _
   ByVal TextLineIdx As Integer _
) As String

public string GetTextLineValue( 
   string OCRResultID,
   int TextLineIdx
)

public function GetTextLineValue( 
    OCRResultID: String;
    TextLineIdx: Integer
): String;

public function GetTextLineValue( 
   OCRResultID : String,
   TextLineIdx : int
) : String;

public: string* GetTextLineValue( 
   string* OCRResultID,
   int TextLineIdx
)

public:
String^ GetTextLineValue( 
   String^ OCRResultID,
   int TextLineIdx
)

Parameters

OCRResultID: The unique result identifier of the executed OCR process obtained by the GdPictureOCR.RunOCR method.
TextLineIdx: The 0-based index of the line within the specified OCR result. It must be a value between 0 and GdPictureOCR.GetTextLineCount(OCRResultID) - 1.

Return Value

The value of the specified line. Please always use the GdPictureOCR.GetStat method to determine if this method has been successful.

Remarks

It is recommend to use the GdPictureOCR.GetStat method to identify the specific reason for the method's failure, if any.

Example

How to find out the recognized lines.

VB.NET
C#

Dim caption As String = "Example: GetTextLineValue"
Dim gdpictureOCR As GdPictureOCR = New GdPictureOCR
Dim gdpicturePDF As GdPicturePDF = New GdPicturePDF
'Load the PDF document.
If gdpicturePDF.LoadFromFile("input.pdf", False) = GdPictureStatus.OK Then
    'Set the new origin for better coordinates handling.
    gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginTopLeft)
    gdpicturePDF.SetLineColor(Color.Olive)
    gdpicturePDF.SetLineWidth(2)
    'Select the first page.
    gdpicturePDF.SelectPage(1)
    'Render this page to a 200 DPI image.
    Dim image As Integer = gdpicturePDF.RenderPageToGdPictureImage(200, True)
    If gdpicturePDF.GetStat = GdPictureStatus.OK AndAlso
       gdpictureOCR.SetImage(image) = GdPictureStatus.OK Then
        'Setting up the image is mandatory.
        Dim message As String = Nothing
        'Set up the OCR parameters.
        gdpictureOCR.ResourcesFolder = "C:\Path\To\GdPicture.NET 14\Redist\OCR"
        gdpictureOCR.AddLanguage(OCRLanguage.English)
        'Set up the OCR context and the character list.
        gdpictureOCR.Context = OCRContext.OCRContextSingleBlock
        gdpictureOCR.CharacterSet = ""
        'Run the OCR process.
        Dim resID As String = gdpictureOCR.RunOCR()
        If gdpictureOCR.GetStat = GdPictureStatus.OK Then
            Dim linesCount As Integer = gdpictureOCR.GetTextLineCount(resID)
            If gdpictureOCR.GetStat() = GdPictureStatus.OK Then
                message = message + "The number of recognized text lines: " + linesCount.ToString() + vbCrLf
                Dim line As String = ""
                For i As Integer = 0 To linesCount - 1
                    message = message + i.ToString() + ":"
                    line = gdpictureOCR.GetTextLineValue(resID, i)
                    If gdpictureOCR.GetStat() = GdPictureStatus.OK Then
                        message = message + line
                    Else
                        message = message + gdpictureOCR.GetStat().ToString()
                    End If
                    message += vbCrLf
                Next
                MessageBox.Show(message, caption)
                'Continue with analyzing the result ...
            Else
                MessageBox.Show("The GetTextLineCount() method has failed with the status: " + gdpictureOCR.GetStat().ToString())
            End If
        Else
            MessageBox.Show("The error occurred when running the OCR. Status: " + gdpictureOCR.GetStat().ToString(), caption)
        End If
        'Release the image.
        GdPictureDocumentUtilities.DisposeImage(image)
    Else
        MessageBox.Show("The error occurred when creating or setting up the image. Status: " + gdpicturePDF.GetStat().ToString() + "/" + gdpictureOCR.GetStat().ToString(), caption)
    End If
    'Close the document.
    gdpicturePDF.CloseDocument()
Else
    MessageBox.Show("The file can't be loaded. Status: " + gdpicturePDF.GetStat().ToString(), caption)
End If
'Release resources.
gdpictureOCR.ReleaseOCRResults()
gdpictureOCR.Dispose()
gdpicturePDF.Dispose()

string caption = "Example: GetTextLineValue";
GdPictureOCR gdpictureOCR = new GdPictureOCR();
GdPicturePDF gdpicturePDF = new GdPicturePDF();
//Load the PDF document.
if (gdpicturePDF.LoadFromFile("input.pdf", false) == GdPictureStatus.OK)
{
    //Set the new origin for better coordinates handling.
    gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginTopLeft);
    gdpicturePDF.SetLineColor(Color.Olive);
    gdpicturePDF.SetLineWidth(2);
    //Select the first page.
    gdpicturePDF.SelectPage(1);
    //Render this page to a 200 DPI image.
    int image = gdpicturePDF.RenderPageToGdPictureImage(200, true);
    if ((gdpicturePDF.GetStat() == GdPictureStatus.OK) &&
        (gdpictureOCR.SetImage(image) == GdPictureStatus.OK)) //Setting up the image is mandatory.
    {
        string message = "";
        //Set up the OCR parameters.
        gdpictureOCR.ResourcesFolder = "C:\\Path\\To\\GdPicture.NET 14\\Redist\\OCR";
        gdpictureOCR.AddLanguage(OCRLanguage.English);
        //Set up the OCR context and the character list.
        gdpictureOCR.Context = OCRContext.OCRContextSingleBlock;
        gdpictureOCR.CharacterSet = "";
        //Run the OCR process.
        string resID = gdpictureOCR.RunOCR();
        if (gdpictureOCR.GetStat() == GdPictureStatus.OK)
        {
            int linesCount = gdpictureOCR.GetTextLineCount(resID);
            if (gdpictureOCR.GetStat() == GdPictureStatus.OK)
            {
                message = message + "The number of recognized text lines: " + linesCount.ToString() + "\n";
                string line = "";
                for (int i = 0; i < linesCount; i++)
                {
                    message = message + i.ToString() + ":";
                    line = gdpictureOCR.GetTextLineValue(resID, i);
                    if (gdpictureOCR.GetStat() == GdPictureStatus.OK) message = message + line;
                    else message = message + gdpictureOCR.GetStat().ToString();
                    message += "\n";
                }
                MessageBox.Show(message, caption);
                //Continue with analyzing the result ...
            }
            else
                MessageBox.Show("The GetTextLineCount() method has failed with the status: " + gdpictureOCR.GetStat().ToString());
        }
        else
            MessageBox.Show("The error occurred when running the OCR. Status: " + gdpictureOCR.GetStat().ToString(), caption);
        //Release the image.
        GdPictureDocumentUtilities.DisposeImage(image);
    }
    else
        MessageBox.Show("The error occurred when creating or setting up the image. Status: " + gdpicturePDF.GetStat().ToString() + "/" + gdpictureOCR.GetStat().ToString(), caption);
    //Close the document.
    gdpicturePDF.CloseDocument();
}
else
    MessageBox.Show("The file can't be loaded. Status: " + gdpicturePDF.GetStat().ToString(), caption);
//Release resources.
gdpictureOCR.ReleaseOCRResults();
gdpictureOCR.Dispose();
gdpicturePDF.Dispose();

Reference

GdPictureOCR Class
GdPictureOCR Members
GetTextLineCount Method
GetTextLineWordCount Method
RunOCR Method