“error LNK2019: unresolved external symbol” error in Visual Studio 2010

Question

I'm trying to compile and run a C code that is using libsndfile library for sound files processing.

I have added the header file using this path: project's Properties (in C/C++ -> General -> Additional Include Directories)

Also i have linked the library using this path: Project Properties -> Linker -> Input -> Additional Dependencies.

But while debugging, i get the following errors:

1>sil.obj : warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/INCREMENTAL:NO' specification 1>sil.obj : error LNK2019: unresolved external symbol _sf_write_sync referenced in function _main 1>sil.obj : error LNK2019: unresolved external symbol _sf_write_double referenced in function _main 1>sil.obj : error LNK2019: unresolved external symbol _sf_close referenced in function _main 1>sil.obj : error LNK2019: unresolved external symbol _sf_read_double referenced in function _main 1>sil.obj : error LNK2019: unresolved external symbol _sf_open referenced in function _main 1>c:\users\anam\documents\visual studio 2010\Projects\silence\Debug\silence.exe : fatal error LNK1120: 5 unresolved externals

Can someone please identify the problem here? I'm new at using Visual Studio and I really need help!

Answer 1

I faced the same problem. I solved it as follows.

1)Make sure that you are downloading the 32 bit libsndfile(libsndfile-1.0.25-w32-setup.exe) package because the Visual studio compiler is 32 bit.

2)Install the library by clicking on the setup.exe(libsndfile-1.0.25-w32-setup.exe) file of libsndfile.

3)After creating your project, do the following 2 steps:

i)Go to Debug >> Project Properties >> Configuration Properties >> C/C++ >> General >> Additional Include Directories >> Click on the arrow on the right hand side and then click on edit >> Here, add the path of the include folder in your libsndfile directory.

ii)After step (i) is complete, click on Linker in Configuration Properties >> General >> Additional Library Directories >> Click on the arrow on the right hand side and then click on edit >> Here, add the path of the .lib file. You may have to type in the entire path since the browse option does not show the .lib file. So, in my case I typed C:\Program Files (x86)\Mega-Nerd\libsndfile\lib\libsndfile-1.lib.

Finally, you are done! Your code should compile and work now without throwing any errors.

Answer 2

Missing to specify the folder directory of the library (.lib added to Additional Dependencies) VC++ Directories view
Click on Library Directories, click the drop-down button on the right and choose
and specify the directory it should work.

Answer 3

I had a similar issue and the problem was mixing a x64 lib and a win32 project.