Hi all,
I'm trying API examples
<https://github.com/tesseract-ocr/tesseract/wiki/APIExample#example-using-the-c-api-in-a-c-program>,
but I couldn't build the example using ChoiceIterator because of linker
errors.
Here is my code:
#include "stdafx.h"
#include "allheaders.h"
#include "baseapi.h"
#include <time.h>
using namespace std;
using namespace tesseract;
#pragma comment(lib, "liblept168")
#pragma comment(lib, "libtesseract302")
#pragma comment(lib, "winmm.lib")
int main(int argc, char* argv[])
{
try
{
char *outText;
const char *path =
"D:\\160614\\tesseract_testing\\test_texts\\tesseract_training\\";
TessBaseAPI *api = new TessBaseAPI();
if (api->Init(path, argv[2])) {
fprintf(stderr, "Could not initialize tesseract.\n");
exit(1);
}
Pix *image = pixRead(argv[1]);
api->SetImage(image);
//Get OCR result
outText = api->GetUTF8Text();
printf("OCR output:\n%s", outText);
api->SetImage(image);
api->SetVariable("save_blob_choices", "T");
api->SetRectangle(37, 228, 548, 31);
api->Recognize(NULL);
tesseract::ResultIterator* ri = api->GetIterator();
tesseract::PageIteratorLevel level = tesseract::RIL_SYMBOL;
if (ri != 0) {
do {
const char* symbol = ri->GetUTF8Text(level);
float conf = ri->Confidence(level);
if (symbol != 0) {
printf("symbol %s, conf: %f", symbol, conf);
bool indent = false;
tesseract::ChoiceIterator ci(*ri);
do {
if (indent) printf("\t\t ");
printf("\t- ");
const char* choice = ci.GetUTF8Text();
printf("%s conf: %f\n", choice, ci.Confidence());
indent = true;
} while (ci.Next());
}
printf("---------------------------------------------\n");
delete[] symbol;
} while ((ri->Next(level)));
}
}
catch (...)
{
printf("error!");
}
return 0;
}
Build output:
1>Tesseract-ocr_tutorial_160607.obj : error LNK2001: unresolved external
symbol "public: __thiscall tesseract::ChoiceIterator::ChoiceIterator(class
tesseract::LTRResultIterator const &)" (??
0ChoiceIterator@tesseract@@QAE@ABVLTRResultIterator@1@@Z)
1>Tesseract-ocr_tutorial_160607.obj : error LNK2001: unresolved external
symbol "public: __thiscall tesseract::ChoiceIterator::~ChoiceIterator(void)"
(??1ChoiceIterator@tesseract@@QAE@XZ)
1>Tesseract-ocr_tutorial_160607.obj : error LNK2001: unresolved external
symbol "public: char const * __thiscall
tesseract::ChoiceIterator::GetUTF8Text(void)const " (?
GetUTF8Text@ChoiceIterator@tesseract@@QBEPBDXZ)
1>Tesseract-ocr_tutorial_160607.obj : error LNK2001: unresolved external
symbol "public: float __thiscall
tesseract::ChoiceIterator::Confidence(void)const " (?
Confidence@ChoiceIterator@tesseract@@QBEMXZ)
1>Tesseract-ocr_tutorial_160607.obj : error LNK2001: unresolved external
symbol "public: bool __thiscall tesseract::ChoiceIterator::Next(void)" (?
Next@ChoiceIterator@tesseract@@QAE_NXZ)
1>C:\(my path)\Tesseract-ocr_tutorial_160607\Release\Tesseract-
ocr_tutorial_160607.exe : fatal error LNK1120: 5 unresolved externals
I test one more code:
#include "stdafx.h"
#include "allheaders.h"
#include "baseapi.h"
using namespace std;
using namespace tesseract;
#pragma comment(lib, "liblept168")
#pragma comment(lib, "libtesseract302")
int main(int argc, char* argv[])
{
tesseract::ResultIterator* ri;
tesseract::ChoiceIterator ci(*ri);
return 0;
}
Build output:
1>Tesseract-ocr_tutorial_160607.obj : error LNK2001: unresolved external
symbol "public: __thiscall tesseract::ChoiceIterator::ChoiceIterator(class
tesseract::LTRResultIterator const &)" (??
0ChoiceIterator@tesseract@@QAE@ABVLTRResultIterator@1@@Z)
1>Tesseract-ocr_tutorial_160607.obj : error LNK2001: unresolved external
symbol "public: __thiscall tesseract::ChoiceIterator::~ChoiceIterator(void)"
(??1ChoiceIterator@tesseract@@QAE@XZ)
1>C:\(my path)\Tesseract-ocr_tutorial_160607\Release\Tesseract-
ocr_tutorial_160607.exe : fatal error LNK1120: 2 unresolved externals
Other classes are working fine, but ONLY ChoiceIterator is not working.
LTRResultIterator also can be built, although both LTRResultIterator and
ChoiceIterator are defined in ltrresultiterator.h.
Do you have any suggestions?
Environment
Windows 7
Visual Studio 2013
Tesseract 3.02
Thanks,
Lee.
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