Problems including MATLAB "engine.h" for C++ code - c++

Question

I am trying to run the example code from the MATLAB Doc, but when I try to build the project in Visual Studio I get this error
fatal error C1083: Cannot open include file: 'engine.h': No such file or directory
The fact is that in the Doc I cannot find where to find the header to link it, they show the examples as if there was no need to do anything else, just do the
#include "engine.h";
Any ideas about how to solve this issue?
EDIT
I solved the first problem but now I get some errors reated to missing libs:
1>engwindemo.obj : error LNK2019: unresolved external symbol _engClose referenced in function _main
1>engwindemo.obj : error LNK2019: unresolved external symbol _mxGetClassName referenced in function _main
1>engwindemo.obj : error LNK2019: unresolved external symbol _engGetVariable referenced in function _main
1>engwindemo.obj : error LNK2019: unresolved external symbol _engOutputBuffer referenced in function _main
1>engwindemo.obj : error LNK2019: unresolved external symbol _mxDestroyArray referenced in function _main
1>engwindemo.obj : error LNK2019: unresolved external symbol _engEvalString referenced in function _main
1>engwindemo.obj : error LNK2019: unresolved external symbol _engPutVariable referenced in function _main
1>engwindemo.obj : error LNK2019: unresolved external symbol _mxGetPr referenced in function _main
1>engwindemo.obj : error LNK2019: unresolved external symbol _mxCreateDoubleMatrix_730 referenced in function _main
1>engwindemo.obj : error LNK2019: unresolved external symbol _engOpen referenced in function _main
I set the Path variable as told in the documentation, set the lib path and added some libraries and now I don't know what else can I do. I also rebooted VisualStudio in order to make the Path variable change effective.
Thanks in advance.

Answer 1

I finaly solved the problem. I was building a WIN32 project, while matlab is x64, so VisualStudio gives errors when you try to link 64-bit platforms. The solution is changing the Active Solution Platform to x64, inside Project Properties -> Configuration Manager.
It is well explained in the following link.
Thanks anyway for the answers, they were useful.
So, summarizing, to be able to compile and run a c++ code in VisualStudio2008 and Matlab2010 with engine.h, the following steps are required:
1.- Set Path variable in Advanced System Settings-> environment variables: C:\Program Files\MATLAB\R2010a\bin\win64 (or the path where libeng.dll is located)
2.- In project properties of VisualStudio, link in Additional Include directories of C++->General:
"C:\Program Files\MATLAB\R2010a\extern\include"
3.- In project properties, linker->general, Additional Library Directories:
"C:\Program Files\MATLAB\R2010a\extern\lib\win64\microsoft"
4.- Add the following libraries in Linker->Additional Dependencies:
libeng.lib
libmx.lib
5.- Change the Active Solution Platform to x64, in Configuration Manager as explained in the link.

Answer 2

Have you added the MATLAB include directory to your project's include path?
. The directory should be like "C:\Program Files\MATLAB\R2010a\extern\include"

Answer 3

In case you forgot, add the folder containing libmat.dll libmx.dll etc. to your path. For me that was:
C:\Program Files\MATLAB\R2012a\bin\win64

Answer 4

While the Jav_Rock's answer is completely correct, I want to add information about one of the points:
1.- Set Path variable in Advanced System Settings-> environment variables: C:\Program Files\MATLAB\R2010a\bin\win64 (or the path where
libeng.dll is located)
I spent three hours to understant what does it means, so I want to clarify this moment for future researchers.
You need to add the path of MATLAB Engine dll libraries to your Windows.
We can do it this way:
My Computer -> right click: Settings. Opened System window. Left bottom corner: Advanced System Settings
Advanced Tab
In the Environment variables for your user press Create... button and add this one:
Variable name: PATH
Variable value: C:\Program Files\MATLAB\R2016a\bin\win64
This path is reference on where is your libeng.dll located.
Important moment: it can require to restart VS or even restart computer.