I'm trying to build OpenCV 2.4.6 on Windows 8 in Visual Studio 2012. Having downloaded the source from https://github.com/Itseez/opencv I generate (leaving the default configuration) using cmake and then load the resulting file ALL_BUILD.vcxproj into Visual Studio 2012. I then try to build it. Several of the modules do indeed build (e.g. core, flann, imgproc, ...) but I am trying to build highgui so that I can use the PDB file for debugging my code (which fails to open a video file). The build errors start with this and many similar errors:
error C2039: 'max' : is not a member of 'std' C:\OpenCV2.4.6\3rdparty\openexr\Imath\ImathMatrixAlgo.cpp 1094 1 IlmImf
One fix for errors like this (e.g. in this answer) is to add #include <algorithm> to the failing files. I tried that on a few files and it seems to work but I'm nervous about locally changing the source for a popular library. It must build on Windows (you can download the binaries, though not the PDB files, from the OpenCV sourceforge site) so I would like to understand how to build it on my machine without changing the source.
Am I missing something out in the configuration step? Is there some path setting etc. missing on my machine? Why am I getting these errors and how should I fix them?
========== EDIT ==========
Looking at the directory path this appears to be a problem with one of the 3rd party dependencies, OpenEXR. Looking on Github it appears to be version 1.7.1 of OpenEXR that is used in OpenCV 2.4.6. The instructions in the OpenCV's Quick Start Installation on Windows state:
In case of the Eigen library it is again a case of download and extract to the D:/OpenCV/dep directory.
Same as above with OpenEXR.
so I downloaded the OpenEXR 1.7.1 source code release and extracted the resulting files putting the directory openexr-1.7.1 into C:\OpenCV2.4.6\dep.
Then I ran cmake and tried to build the resulting Visual Studio solution. Sadly I see the same errors.
I was stumbling on the same issue while compiling OpenEXR. Then I found the solution googling for openexr std::min.
There is an issue opened on OpenCV where it says that, when using VS2013 Preview, you must add the line #include <algorithm> in the file where you're using std::min and std::max.
I put that line into the files where these methods are called and voilà! Compilation succeeded.
You probably need to #define NOMINMAX. Try putting it before any other includes.
If that helps, then put in the you project's preprocessor defines.
There's lots of info about this, just search for NOMINMAX. Here's one post about it.
#include <iostream>
#include <algorithm>
Just include above 2 lines to the cpp file and the compilation error will disappear.
Related
I have recently added dlib 19.1 to my project in Visual Studio 2013. I'm able to run compile the library without problem, to run the example and also to create my own console applications and make it work just fine.
But when integrating dlib to my project, I have recently faced the current error:
Error 14 error : identifier "WaitForSingleObject" is undefined
\include\dlib\threads\threads_kernel_1.h 120
There are 50 errors similar to this one, all in threads_kernel_1.h
I'm looking to all project properties and didn't find anything suspicious compare to my example project that include dlib.
identifier "WaitForSingleObject" is defined by including <windows.h> header in your application. this header is included by \include\dlib\threads\threads_kernel_1.h, but something went wrong on your machine
You can try using this function separate from dlib and check if it works in your application first.
Also you can explicitly #include <windows.h> at the top of your cpp file
And do you have any custom "windows.h" file in your application, may be some naming conflict?
Also I can recommend you generating Visual Studion project by CMake and then using it from IDE
I have seen the documentation of OpenCV. In there, SurfFeatureDetector, SurfDescriptorExtractor and BruteForceMatcher are being used.
But when I try in my code, it is showing -
Error : identifier "SurfFeatureDetector" is unidentified.
Same case for other two.
After going through some threads and forums, I tried to include some header files like - #include <opencv2 nonfree="" features2d.hpp=""> and some others but those files don't exist. So shows another error saying -
Error : Cannot open source file "opencv2/nonfree/features2d.hpp"
Is there any alternative way to do these in OpenCV 3.0.0?
I had similar problem and it got fixed when I built Opencv locally on my system instead of using pre-built libraries. You can refer to this thread for building Opencv on your system Where is the lib folder (or its replacement) in the current OpenCV?
In opencv3.0, SURF/SIFT/BruteForceMatcher have been moved to a seperate opencv_contrib repository, you may download it and make changes to cmake path for Visual Studio to recognize these functions. Although it did appear after building it locally on my system without doing any additional modification.
After you built it locally you can find it in the following path
Build_folder/install/include/opencv2/features2d.hpp
I've recently decided to try out PostgreSQL as the database platform for some C++ development I'm working on. I decided to use libpqxx as the connection library for my project, and quickly found out this would be an uphill battle to do from VS 2015 on a Windows 10 machine.
After much teeth-gnashing and nail-biting, I have gotten libpqxx to compile on Windows 10.
This leaves me with the following directory structure
Per libpqxx's documentation, I also placed a copy of libpq.dll in my project's executable directory. Please note: I have done this for both debug and release builds, tried to build both, and ended up with the same result.
All the tutorials I've seen seem to indicate that the library can be used after linking it and simply #including pqxx/pqxx, so I set up a small project to do just that. I receive the error:
fatal error C1083: Cannot open include file: 'pqxx/pqxx': No such file or directory
When attempting to build the project. I have also tried this will both debug and release builds, to no avail.
Here is a screenshot of my linker settings.
Does anyone have any suggestions for how I might be able to link and use this library from Visual Studio 2015?
As Sami Kuhmonen pointed out, this was not actually a linker error, but a compiler error. I needed to include an actual header, which Visual Studio needed to be able to find. After adding the correct folder (C:\libpqxx\include in my case) to Visual Studio's "additional include directories" setting under C\C++ -> General per drescherjm's suggestion, the program compiles just fine.
For future reference:
I did also run into unresolved external linker errors after solving the initial issue. This is because you need to make sure to also link to ws2_32.lib and libpq.lib. You also need to copy some other DLL files that libpq also relies on into your libpqxx lib folder. On my system, I believe these were ssleay32.dll, libeay32.dll, and libintl-8.dll. These files reside under the root of the PostgreSQL install. The DLL step is mentioned under libpqxx's INSTALL.txt file, however I believe it stated that the DLLs resided one folder under where I actually found them.
I have also faced same issue. Then I realized that I was building ,my application as a 32bit. I changed the target to x64 and it compiled successfully
I am studying Machine Learning and Pattern Recognition and using dlib library for that. I was trying one example code face_detection_ex.cpp provided with the library. I created a separate project under Visual Studio 2010 and included the face_detection_ex.cpp example and dlib\all\source.cpp files. It build fine. But, if I enable DLIB_JPEG_SUPPORT by
#define DLIB_JPEG_SUPPORT
then it will throw the linking error LNK2019 for all the functions of libjpeg library used by the dlib library. I tried #pragma comment(lib, libjpeg) and I also tried to include the library in project properties, but still the same.
After spending 1 day on this error, I switched to linux and try to work in that. But there also I am getting the same linking errors.
Then on the dlib release-note I read that libjpeg library is included in dlib's external folder and use dlib's cmake file for the example code and cmake will perform the static linking. I tried that and with cmake it is linking. I tried to find out how the linking is happening as I want it to work with visual studio and other compilers also but I couldn't find out why the libjpeg library is unable to link.
Any suggestion?
EDIT: Here it is mentioned how to use dlib with Visual Studio. And how to compile the example on linux. So, as I have to link with libjpeg library, I added the -ljpeg in the command.
You can use CMake to generate a Visual Studio project that is properly configured and that's the easiest way to do this if you want to use Visual Studio.
However, if you really want to configure the Visual Studio project by hand then all you need to do is add the files in the dlib/external/libjpeg folder to your Visual Studio project and also add the dlib/external/libjpeg folder to the include search path.
I'm working on adding some openCV features to a couple projects that use the Kinect and openGL/freeGLUT. I have downloaded and installed OpenCV using the pre-built libraries and successfully run a simple sample. Now I want to work with the Kinect Bridge with OpenCV Basics sample from the Kinect for Windows Developer Toolkit to get a better idea of how to use OpenCV with the Kinect. I downloaded the sample into my projects folder, opened the solution in visual studio and built it. I got the following errors:
Error 1 error C1083: Cannot open include file:
'opencv2/core/core.hpp': No such file or
directory c:\users\justin\documents\visual studio
2010\projects\kinectbridgewithopencvbasics-d2d\OpenCVHelper.h 17
and
Error 2 error C1083: Cannot open include file:
'opencv2/core/core.hpp': No such file or
directory c:\users\justin\documents\visual studio
2010\projects\kinectbridgewithopencvbasics-d2d\OpenCVFrameHelper.h 13
Initially I thought these errors were due to forgetting to specify the additional include directories. I added the same property sheet that my other OpenCV projects use to this one, but the errors remained. I tired copying the header files into the project folder: same thing. It seems like the only thing that works is specifying the full absolute file paths in the #include statements. I want to avoid doing this because visual studio wants me to change every #include in every file used in the project, including the openCV header files. I also tried shortening the name of my project folder in case the file path was too long (though I'm pretty sure that's more of an issue for the header file paths), but again no change.
The include directories and #includes that I'm trying to use are the same as in my other projects. I'm using Visual Studio 2010 on Windows 7 x64 based system.
Why would the additional include directory work for other projects, but not this one?
Usually when I see something like this it turns out to be a bad character in one of the prior include paths or other options that's messing everything up after it. I would take a look at your the command line page in the project configuration and see if you can spot anything amiss.