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Asked: 2026-05-11T06:48:38+00:00

I am having several problems with tessdll in Visual Studio 2008. FYI, I created

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I am having several problems with tessdll in Visual Studio 2008. FYI, I created this app as an MFC application, I did this just to take advantage of the simple GUI I needed. It is just straight C++ and win32 from there on out.

This builds fine as a debug release for some reason (as I have included the header files and lib files that I need, and dll resides in every directory I could put it……).

So, there is a linking problem during building a release version:

Linking... MTGOBot.obj : error LNK2001: unresolved external symbol '__declspec (dllimport) public: __thiscall TessDllAPI::TessDllAPI(char const *)' (__imp_??0TessDllAPI@@QAE@PBD@Z) MTGOBot.obj : error LNK2001: unresolved external symbol '__declspec (dllimport) public: __thiscall TessDllAPI::~TessDllAPI(void)' (__imp_?? 1TessDllAPI@@QAE@XZ) MTGOBot.obj : error LNK2001: unresolved external symbol '__declspec (dllimport) public: int __thiscall TessDllAPI::BeginPage(unsigned int,unsigned int,unsigned char *,unsigned char)' (__imp_? BeginPage@TessDllAPI@@QAEHIIPAEE@Z) MTGOBot.obj : error LNK2001: unresolved external symbol '__declspec (dllimport) public: struct ETEXT_STRUCT * __thiscall TessDllAPI::Recognize_all_Words(void)' (__imp_? Recognize_all_Words@TessDllAPI@@QAEPAUETEXT_STRUCT@@XZ) C:\CPP Projects\Visual Studio 2008\Projects\MTGO SO Bot\MTGO SO Bot \Release\MTGO SO Bot.exe : fatal error LNK1120: 4 unresolved externals

Also, for reference, the source to tessdll.h can be found here: http://code.google.com/p/tesseract-ocr/source/browse/trunk/tessdll.h?r=165

A few more details:

  • I debug by from the toolbar and use the integrated debugger.
  • I use Batch Build to create the release version.
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1 Answer

  1. Without seeing the project settings, this is tough. Things to check (differences between debug and release settings):

    1) Are you including the .lib in the release build?

    2) Did you accidentally define the preprocessor directive for tessdll?

    I’d walk through the settings, switching back-and-forth between debug and release and see what was accidentally added/forgotten.

    The existence of the DLL is only required for run-time. You’re not getting that far.

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