CODEWITHSUNDEEP
c++visual-studio-2015ocrtesseract
Hassan ALi
Hassan ALi

Reputation: 1331

Error LNK2019 unresolved external symbol Tesseract OCR C++ Using VS 2015

Have someone configured Tesseract c++ source-code successfully? It has 32 stars, but I am stuck to even run it as it is

While I am trying to setup the source code of Tesseract in my visual studio, it is giving errors in obj files, how can I edit those files, its not making any sense to me. If I do not do that then what different I should do to run it successfully at my environment (I have same specs as required by the github)

1.Error LNK2019 unresolved external symbol _l_dnaDiffAdjValues referenced in function _ptraConcatenatePdfToData pdfio2.obj

2.Error LNK2019 unresolved external symbol _l_dnaJoin referenced in function _recogAppend recogbasic.obj

3.Error LNK1120 2 unresolved externals tesseract.exe

I Build it with following setps :

1.Downloaded from this Link.

2.Downloaded tesseract and leptonica.

3.It contains a build_tesseract.bat to build the latest tesseract version.

4.I had selected the tesseract as start up Project

here is my .cpp main file 

#include "baseapi.h";
#include "allheaders.h";

int main()
{
    char *outText;

    tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
    // Initialize tesseract-ocr with English, without specifying tessdata path
    if (api->Init(NULL, "eng")) {
        fprintf(stderr, "Could not initialize tesseract.\n");
        exit(1);
    }

    // Open input image with leptonica library
    Pix *image = pixRead("/usr/src/tesseract/testing/phototest.tif");
    api->SetImage(image);
    // Get OCR result
    outText = api->GetUTF8Text();
    printf("OCR output:\n%s", outText);

    // Destroy used object and release memory
    api->End();
    delete[] outText;
    pixDestroy(&image);

    return 0;
}

Upvotes: 1

Views: 2628

Answers (1)

Nikita
Nikita

Reputation: 6427

Error states that it's not possible to run x64/debug/zlib.lib file. It's OK as .lib library file is not executable file.

Most likely, if you have no compilation errors, reason of the problem is in startup configuration. Set project where your main.cpp located as Startup Project.

To compile Tesseract you should put downloaded Leptonica sources into VS2015_Tesseract-master\leptonica folder and downloaded Tesseract sources into VS2015_Tesseract-master\tesseract_3.04. I assume VS2015_Tesseract unpacked into VS2015_Tesseract-master folder.

After that open VS2015_Tesseract-master\tesseract.sln and build tesseract project. You don't need to use build_tesseract.bat.

The result of tesseract build is tesseract.exe. I've put your logic of main() function into main(int argc, char **argv) in VS2015_Tesseract-master\tesseract_3.04\api\tesseractmain.cpp file. It successfully compiled for me.

Upvotes: 2

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