On Thu, Feb 9, 2012 at 1:32 PM, TyDam' <[email protected]> wrote:
> Thanks for your answer.
> I already read and have a look on this project.
> Without modification this project compil and run but when I modify it
> by adding:
>
> tesseract::ResultIterator *ri;
> ri=api.GetIterator();
> char * out2 = ri->GetUTF8Text(tesseract::RIL_SYMBOL);
>
> and when I compil his project with this modification I have the same
> error :
>
> error LNK2019: unresolved external symbol "public: char * __thiscall
> tesseract::ResultIterator::GetUTF8Text(enum
> tesseract::PageIteratorLevel)const " (?
> GetUTF8Text@ResultIterator@tesseract@@QBEPADW4PageIteratorLevel@2@@Z)
> referenced in function _main
>
> As his package don't have .lig and dll file I use mine... and I think
> that the problem come from my files.
> Is there a package available with all lib and dll? I never find
> something like that...
I've just looked at similar issues while creating a VS2008 solution
for tesseract 3.02.
This is a general problem with *any* DLL version of libtesseract. The
libtesseract source files currently *only* export the TessBaseAPI &
STRING classes to DLLs.
It does this by declaring the following in baseapi.h:
class TESSDLL_API TessBaseAPI {
...
}
and in strngs.h (at least once issue 614 [1] is fixed):
class CCUTIL_API STRING {
...
}
where TESSDLL_API is defined in baseapi.h as:
#ifdef TESSDLL_EXPORTS
#define TESSDLL_API __declspec(dllexport)
#elif defined(TESSDLL_IMPORTS)
#define TESSDLL_API __declspec(dllimport)
#else
#define TESSDLL_API
#endif
IF you search around the libtesseract sources, you'll find that no
other classes currently are declared with __declspec(). This, for
example, is why it is currently impossible to build DLL_Debug &
DLL_Release versions of any of the training applications.
'
And it explains why you can't use the ResultIterator when linking to
libtesseract.dll. The current workaround is to link your application
staticly instead. Applications built using the LIB_Debug & LIB_Release
configurations have access to all the "public" libtesseract classes &
functions (which is most of them).
[1] http://code.google.com/p/tesseract-ocr/issues/detail?id=614
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