Saves a GdPicture image as single page searchable PDF stream and performs an OCR recognition. 

The recognized text is written invisibly to the PDF in order to simplify indexing and search. 

For each language of recognition, you have to deploy specific files. See the Dictionary parameter.

public String SaveAsPDFOCRStream(
    int ImageID, 
    ref Stream PDFStream, 
    TesseractDictionary Dictionary, 
    String DictionaryPath, 
    String CharWhiteList, 
    Boolean PDFA, 
    String Title, 
    String Author, 
    String Subject, 
    String Keywords, 
    String Creator
);

Public Function SaveAsPDFOCRStream(
    ByVal ImageID As Integer, 
    ByRef PDFStream As Stream, 
    ByVal Dictionary As TesseractDictionary, 
    ByVal DictionaryPath As String, 
    ByVal CharWhiteList As String, 
    ByVal PDFA As Boolean, 
    ByVal Title As String, 
    ByVal Author As String, 
    ByVal Subject As String, 
    ByVal Keywords As String, 
    ByVal Creator As String
) As String

The recognized text.