Qt and Tesseract Linkage

[SGaist]

The Qt installer provides MinGW directly. It has nothing to do with MSys.

[OlegD]

So my next step must be here
Mingw-w64

Mingw-w64 allows building 32- or 64-bit executables for Windows. It can be used for native compilations on Windows, but also for cross compilations on Linux (which are easier and faster than native compilations). Most large Linux distributions already contain packages with the tools need for a cross build. Before building Tesseract, it is necessary to build some prerequisites.

For Debian and similar distributions (e. g. Ubuntu), the cross tools can be installed like that:

Development environment targeting 32- and 64-bit Windows (required)

apt-get install mingw-w64

Development tools for 32- and 64-bit Windows (optional)

apt-get install mingw-w64-tools

These prerequisites will be needed:

libpng, libtiff, zlib (binaries for Mingw-w64 available as part of the GTK+ bundles)
libicu
liblcms2
openjpeg
leptonica

what should i exactly do?

[SGaist]

Why are you following the cross-compilation instructions from Linux to Windows ?

[OlegD]

Is there the similar command line in MinGW that supplied by QT?

[SGaist]

If memory serves well, you should have some shortcuts in the start menu that starts a command line instance that is ready to use with MinGW.

[OlegD]

Oh, It seems I'm step behind to finish this insane journey..

How can I build it with QT now?

[SGaist]

As usual, point INCLUDEPATH to that folder, then LIBS to the one containing the library files and link against these libraries.

[OlegD]

Failed

D:\PROG\May\Tesseract\main.cpp:1: error: tesseract/baseapi.h: No such file or directory
D:\PROG\May\Tesseract\main.cpp:1:10: fatal error: tesseract/baseapi.h: No such file or directory
1 | #include <tesseract/baseapi.h>
| ^~~~~~~~~~~~~~~~~~~~~

[OlegD]

Here is my pro file
Any thoughts how can I amend this to make it work?

QT += core
QT -= gui

CONFIG += c++11

TARGET = openCV
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app
INCLUDEPATH += C:\opencv\release\install\include

LIBS += C:\opencv\release\bin\libopencv_core455.dll
LIBS += C:\opencv\release\bin\libopencv_highgui455.dll
LIBS += C:\opencv\release\bin\libopencv_imgcodecs455.dll
LIBS += C:\opencv\release\bin\libopencv_imgproc455.dll
LIBS += C:\opencv\release\bin\libopencv_calib3d455.dll
LIBS += C:\opencv\release\bin\libopencv_features2d455.dll
LIBS += C:\opencv\release\bin\libopencv_video455.dll
LIBS += C:\opencv\release\bin\libopencv_videoio455.dll

LIBS += -LC:\Qt\opencv_cv2\OPENCV1\build-qt\lib
-lopencv_calib3d249d
-lopencv_contrib249d
-lopencv_core249d
-lopencv_features2d249d
-lopencv_flann249d
-lopencv_gpu249d
-lopencv_highgui249d
-lopencv_imgproc249d
-lopencv_legacy249d
-lopencv_ml249d
-lopencv_nonfree249d
-lopencv_objdetect249d
-lopencv_ocl249d
-lopencv_photo249d
-lopencv_stitching249d
-lopencv_superres249d
-lopencv_ts249d
-lopencv_video249d
-lopencv_videostab249d

INCLUDEPATH+=D:\MinGW\msys\1.0\src\tesseract-ocr\include\tesseract
LIBS +=-D:\MinGW\msys\1.0\src\tesseract-ocr\include\tesseract

INCLUDEPATH+=D:\MinGW\msys\1.0\src\leptonica-1.68\src
LIBS +=-D:\MinGW\msys\1.0\src\leptonica-1.68\src

SOURCES += main.cpp

DEFINES += QT_DEPRECATED_WARNINGS

[JonB]

@OlegD said in Qt and Tesseract Linkage:

#include <tesseract/baseapi.h>

That is what it it is trying to #include. So what do you think you need to add to INCLUDEPATH? Because what you have in your screenshot for that is wrong.

[OlegD]

I dont know, thats, why I'm asking

[JonB]

@OlegD
A path of tesseract/baseapi.h cannot be found relative to D:\MinGW\msys\1.0\src\tesseract-ocr\include\tesseract, can it? That would have tesseract\tesseract in the middle of it. If you want to find tesseract/baseapi.h you need to start looking from D:\MinGW\msys\1.0\src\tesseract-ocr\include.

This is not a Qt issue, just plain C++.

[OlegD]

Path seem to be ok, I think problem with msys and QT...
is there possibility to make them work together?

[SGaist]

Did you fix the path as suggested by @JonB ?

As a side note, use forward slash for all your paths in your .pro file.

[OlegD]

Same error

INCLUDEPATH +=D:\MinGW\msys\1.0\src\tesseract-ocr\include
LIBS +=-D:\MinGW\msys\1.0\src\tesseract-ocr\include

[JonB]

@OlegD
If you have D:\MinGW\msys\1.0\src\tesseract-ocr\include in your INCLUDEPATH, your code has #include <tesseract/baseapi.h> and the file baseapi.h exists in D:\MinGW\msys\1.0\src\tesseract-ocr\include\tesseract then I do not see why you would get fatal error: tesseract/baseapi.h: No such file or directory.

• Is that indeed the error message you still see?
• Please show the compiler line being executed when it compiles your main.cpp.
• Depending on compiler, it might be possible that it is an issue with where #include <...> is looking. Try changing the line in your code to read #include "tesseract/baseapi.h". Does that make any difference?

[SGaist]

@OlegD said in Qt and Tesseract Linkage:

Same error

INCLUDEPATH +=D:\MinGW\msys\1.0\src\tesseract-ocr\include
LIBS +=-D:\MinGW\msys\1.0\src\tesseract-ocr\include

Remove that LIBS line, it's just plain wrong.