programmatically set writing direction and text line order and orientatin in C++

[fzha...@gmail.com]

I'm trying to write a C++ program using tesseract 4 (beta) to OCR traditional Chinese texts in images. These texts are often written right to left and top to bottom.I read and printed out the page orientation, writing direction and text line order parameters from tesseract detected results. But they are apparently wrong! I wonder if there is a method to programmatically set these parameters before OCRing the images? I assume there has to be a way to do this. But all I found searching the net were posts saying these parameters were read only. Any help will be greatly appreciated!