undefined reference to `tesseract::TessBaseAPI::TessBaseAPI()

[Liu Paulson]

I download  the tesseract-ocr library from the https://code.google.com/p/tesseract-ocr/downloads/list

tesseract-3.02.02-win32-lib-include-dirs.zip

I use the Qt platform to bulid the program:

Add the below code to the project.pro file:

INCLUDEPATH  += ./include/tesseract/ \

                ./include/leptonica/ \

                ./include

LIBS+= ./lib/libtesseract302.dll \

       ./lib/libtesseract302.lib

Add the below code to the project.h file:

#include <tesseract/baseapi.h>

Add the below code to the project.cpp file:

    const char* filename = "./number.jpg";
    const char* lang = "eng";

    tesseract::TessBaseAPI *tess = new tesseract::TessBaseAPI();

////////////////////////////////////////////////////////////////////////////////////////////////
But when I compile the project , the error coming like:
undefined reference to `tesseract::TessBaseAPI::TessBaseAPI()


How can I solve the problem? Anyone can tell me how to connect the library of the tesseract_ocr  in the Qt5.5 ? Thank you very much.

[zdenko podobny]

have a look at qt-box-editor[1] (even I did not test it with for a long time, but there should be support for QT5)

[1] https://github.com/zdenop/qt-box-editor

Zdenko

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[Liu Paulson]

I will try this example tomorrow and  feedback the result to you ......

在 2015年11月2日星期一 UTC+8下午3:39:25，zdenop写道：

[Liu Paulson]

I have download the project qt-box-editor , the .pro file is :

RESOURCES = resources/application.qrc \

    resources/QBE-GNOME.qrc \

    resources/QBE-Faenza.qrc \

    resources/QBE-Oxygen.qrc \

    resources/QBE-Tango.qrc

LIBS += -llept -ltesseract

win32: {

    DESTDIR = ./win32

    CONFIG += release embed_manifest_exe

    TMAKE_CXXFLAGS += -DQT_NODLL

    TMAKE_CXXFLAGS += -fno-exceptions -fno-rtti -static

    #QTPLUGIN += qsvg # image formats

     DEFINES += WINDOWS

    #QMAKE_LFLAGS.gcc += -static-libgcc # -static

    RC_FILE = resources/win.rc

    INCLUDEPATH += $$PWD/win32-external/include/

    LIBS += -lws2_32 -L$$PWD/win32-external/lib

}

unix: {

    greaterThan(QT_MAJOR_VERSION, 5) {

      message(Qt $$[QT_VERSION] was detected.)

      QT += widgets

      INCLUDEPATH += -L/opt/include/

      LIBS += -L/opt/lib

    }

}

But when I bulid the project, error coming: 

cannot find -llept

cannot find -ltesseract

ld returned 1 exit status

Which library should I download ? How can I connect the library in this project?

在 2015年11月2日星期一 UTC+8下午3:39:25，zdenop写道：

have a look at qt-box-editor[1] (even I did not test it with for a long time, but there should be support for QT5)

[1] https://github.com/zdenop/qt-box-editor

[zdenko podobny]

If you want to use tesseract you need to have tesseract library. And tesseract need leptonica[1]

Error message is clear - compiler can not find these libraries - you need to adjust path in project file according location of that libraries.

[1] https://github.com/tesseract-ocr/tesseract#dependencies-and-licenses

Zdenko

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