What upper-level header files are really needed when using Tesseract API and what can be left out?

[Yuliana Zigangirova]

Hi everyone,

I am trying to understand what is a correct way to use Tesseract header files when using the upper-level Tesseract API.

Actually I want to minimize  the number of  includes as much as possible and to leave in my project

only really necessary upper-level headers.

In the comments to "apitypes.h"  I am reading the following:

// The types used by the API and Page/ResultIterator can be found in:
//   ccstruct/publictypes.h
//   ccmain/resultiterator.h
//   ccmain/pageiterator.h
// API interfaces and API users should be sure to include this file, rather
// than the lower-level one, and lower-level code should be sure to include
// only the lower-level file.

Does it mean that I need to add necessary includes into "apitypes.h"  first, such as "baseapi.h"

and than use only this header?  "apitypes.h" only includes "publictypes.h" for the moment,

which is surely not enough.

Do I need  ccstruct, ccmain and ccutil include headers? All of them?

Thanky you very much in advance for your help,

Yuliana

[Zdenko Podobny]

If you install tesseract, all needed headers will be installed to specified/system location.

Referring headers directly to ccstruct etc. is simple bad design of you application.

Zdenko

so 24. 11. 2018 o 14:18 'Yuliana Zigangirova' via tesseract-ocr <tesser...@googlegroups.com> napísal(a):

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[Yuliana Zigangirova]

Thank you for your answer. The problem is - I have an old Linux system,

where I need to link tesseract to my application.  I can not install

tesseract there.  So I thought I would

take libtesseract.a and the necessary headers and link it.

Could you tell me what is supposed to me a basic  minumum of

the headers for the external application?  You are right,  I want to  avoid

linking directly to subdirectories, that was exactly the purpose of

my question.

Thank you again,

Yuliana Zigangirova

[Zdenko Podobny]

Your explanation is quite strange for me: you want to build application that use tesseract in environment where you can not build/install tesseract??? 

Anyway it your problem: installed header your can find here:

 https://github.com/tesseract-ocr/tesseract/blob/267b79982d64e48d11eaa99ee2618106662a9b10/CMakeLists.txt#L319

Minimum of the header will depend on maxim of tesseract usage ;-) e.g. capi.h header will be needed if you will use it C-API... ocrclass.h should be needed only in case you want to use progress/cancel function etc.

Zdenko

so 24. 11. 2018 o 15:57 'Yuliana Zigangirova' via tesseract-ocr <tesser...@googlegroups.com> napísal(a):

To view this discussion on the web visit https://groups.google.com/d/msgid/tesseract-ocr/8ecb697c-02ab-4295-a8ff-a279d95587f6%40googlegroups.com.