CODEWITHSUNDEEP
c++visual-studio-2010opencv
user1767754
user1767754

Reputation: 25094

Visual Studio 2010 - Create Convenience Static Library OpenCv

For learning purposes, i wanted to create a static library, a "package" of the lib files used in opencv to then link it against my app "opencvuser". Doing so, i get tremendous amounts of erros. (LNK2005 and LNK2019)

My Setup:

Project: staticLib

Project: opencvuser

What i expect: Now i should get the same functionallity, as i would add the opencv lib files instead of my built staticLib.lib is my expectation correct?

What i've checked so far:

Anyone knows if the Runtime-Library setting on the static libraries are set to "Multi-threaded Debug"?

enter image description here

Upvotes: 2

Views: 1420

Answers (1)

Ove
Ove

Reputation: 6317

You are getting those linker errors because the OpenCV libs you are trying to use were statically linked against the CRT. In your project, you are dynamically linking to CRT and these things won't mix. I would recommend that you don't try to create a "package" of all the OpenCV libs and instead just link to the specific libs you need where you need them.

But I am also going to show you how to solve your problem:

  • You need to recompile OpenCV without statically linking to the CRT.

    You can check out the OpenCV documentation for instructions on how to compile OpenCV using CMake and Visual Studio 2010. When you run CMake, after you pressed the "Configure" button, look for an option called "BUILD_WITH_STATIC_CRT" and disable it. Then you can press "Generate", open the solution with VS2010 and compile OpenCV.

  • In your VS2010 project, use the following settings:

    In the "opencvuser" project configuration, under Librarian, additional library directories you need to add the path to where the .lib files that you built are located. For me, it's in "c:\opencv248\mybuild\lib\Debug\". Under Additional Dependencies, you need to include all the OpenCV lib files (opencv_core248d.lib, etc). I also needed to include Comctl32.lib and zlibd.lib because if I didn't I would get some linker errors.

Librarian settings

Here are the dependencies I put in:

opencv_calib3d248d.lib opencv_contrib248d.lib opencv_core248d.lib opencv_features2d248d.lib opencv_flann248d.lib opencv_gpu248d.lib opencv_haartraining_engined.lib opencv_highgui248d.lib opencv_imgproc248d.lib opencv_legacy248d.lib opencv_ml248d.lib opencv_nonfree248d.lib opencv_objdetect248d.lib opencv_ocl248d.lib opencv_photo248d.lib opencv_stitching248d.lib opencv_superres248d.lib opencv_ts248d.lib opencv_video248d.lib opencv_videostab248d.lib Comctl32.lib zlibd.lib

Also, in the "opencvuser" project you need to add an empty .cpp file. If you don't add this file, the solution will be empty and Visual Studio won't compile it. I just added a file called "dummy.cpp" to the project. That file is completely empty. Don't put a "main()" function in it because it will collide with the main function in the other project and you will get an error.

In the "staticlib" project, under Linker->General, Additional library directories, you need to include the path to the opencvuser.lib file. For me, it's "..\debug". Also, under Linker->Input, Additional Dependencies, you need to add the "opencvuser.lib" file.

Linker general Linker input

  • Set project dependencies

    You also need to make sure that the projects are built in the right order (first opencvuser, then staticlib). To do this, right-click on the solution and choose Properties. In that window, under Common Properties->Project dependencies, make sure that "opencvuser" does not have a dependency on "staticlib", but "staticlib" must have a dependency on "opencvuser".

Project dependencies

That's it, now your project should work. Here are the contents of the two files, and the project running.

Contents of the two files Project working

Upvotes: 1

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