I'm trying to use the xgboost library to basically translate a model I developed in R to C++.
I've not used an external library and other sources online did not help me much so decided to ask the question here to hopefully find the way to do it.
Here's the library I need to use in my C++ code: https://github.com/dmlc/xgboost
I'm using Visual Studio Ultimate 2013. I have a make file that I use to define my project.
I am looking for the proper way to use this library in my C++ code.
If you have ever used this library before, I really appreciate your help. Any hint will be appreciated.
To use the library, one needs to first build it. I could not manage to build the master branch. So, I decided to use the V0.4 instead. I built the solution in that branch using Visual Studio and it produced the dll and lib files. One can then import the .dll file by using Add_library to add it via Cmake. After Add_library, the include directories need to be added by include_directories command.
I need to generate .a and .so files in the end. I'm working in windows and could not find a way to generate these files, yet!
So I found the way to resolve this issue. I shared it in another answer
Add an external library (e.g., Eigen) via CMake
Hope this helps people who are looking!
Related
I'm trying to add a static library to my C++/ROS project and having trouble wondering where to start. I have the project currently working with a CMake file to build it and have downloaded (and can build) an external static library that I want to use in the project.
I am very new to CMake and C++ in general and am working on a project that I haven't created myself. I've read a lot of tutorials on how to add libraries but I'm stuck at knowing where to start as I know there are many different steps needed. I was looking at find_library(), add_library() and ExternalProject_Add() but I don't really understand the difference and the documentation doesn't make it much clearer. As it stands the CMake file has very little in it so I was wondering what exactly I need to add and what commands are best just to be able to use this library in my project. Specifically, I guess what set of commands would I add to a pretty empty CMake file for it to work given I have the lib.a file. Sorry for the vagueness but any help would be appreciated.
The odd is that I can understand CMAKE documents, but I still can not figure out how to use it in a little more complicated scenario.
I want to install a SHARED LIB, to let someone else use it.
I know I can install it with CMAKE install command, but my first question is that my code still works without installing the library. The library is built and put under cmake_build_debug dir.
All I did is:
FILE(GLOB SHAREAD_SRC
${CMAKE_CURRENT_SOURCE_DIR}/Interface/*.cpp
)
set(MY_LIB mylib)
add_library(${MY_LIB} SHARED ${SHAREAD_SRC})
add_executable(run_src src/my_src.cpp ${HEADERS})
target_link_libraries(run_src ${MY_LIB})
I can now include the library's header in my source code and start to use it.
My question is,
in add library command, should I also include my library's header files? Currently i only include the source files to build the library, since whenever I use the library, I know where physically the library headers are(since i made this library), and for those others who also want to use this lib, i would provide them the header and the built lib target, so whereever they want to put them, no problem.
some answers talk about the install command saying that without the header files included in add_library, Why add header files into ADD_LIBRARY/ADD_EXECUTABLE command in CMake, otherwise you won't see headers in IDE-generated project. My headers are in this project, so I don't understand this issue. Why do I need to install this library? What is the purpose of install if the user downloaded my header file and have the built binary?
Thanks for helping! Appreciation in advance.
Except for the mentioned reason that specified files gonna be "visible" in IDE there is one more: explicit better than implicit (yeah Pythonish statement) -- meaning that you give a hint to the reader of your CMakeLists.txt of what exact files your library consists of. And yes, using GLOB for sources is the known bad practice for many reasons -- IRL it's not really hard to maintain the list of sources explicitly and makes your build system less error-prone. In some circumstances, you can gain some more benefits of having headers mentioned explicitly (e.g. using install(TARGET ... PUBLIC_HEADERS ...) but this is the other subject :)
You didn't specify your workflow (how do you build and distribute your project/library). However, the primary goal of install is to form the built image of your project -- i.e. what targets/files/directories gonna be installed and into what directory layout. It's needed to build other projects dependent on yours or produce packages (w/ CPack) to distribute or deploy 'em somewhere.
Also, to let others use your built library in CMake way please read how to make a package section in the manual. So, others can just do find_package(YourProject) and use it (link w/ it via target_link_libraries) -- easy peasy!
I am unfamiliar with C++ but I got a project that needed to deal with it.
I need to use a library available online, RtAudio, and of course I need to
import it in my program.
My question is, how do I use/do it?
Here is my understanding on the library, I am sure that I am totally wrong, but
just to tell where I am.
I think i cannot use the file that I download directly but change it to a lib file and a dll file (as I have use some other precompile library before and it only require a dll and lib file[.h too of course]; I know how to put these into MSVC 2015 and use it).
And also I think in order to compile the library into dll and lib file I need to do something with the follow file in the cmd in window: configure, install, and makefile.in
I am desperate as I had already given up using another library before as I do not know how to deal with this, therefore it will be nice that if anyone can give any help. Thanks.
I'm a newbie when compiling and adding 3rd party C++ libraries into XCode... So here's the problem. I have .cpp files wich depend on 3 libraries. OpenCV-Eigen-SuperLU. So far think that I managed to add correctly OpenCV-Eigen, but I got trouble adding SuperLU.
I'm really confused on where should I include source files paths??. Some tutorials say that I need to create a static lib... other that I need a framework... on the other hand there are XCode project template which just include src files into a folder inside XCode project's and then reference them from build setting properties. Anyway I really need some guidance here.
So here's my setup for most of the libs. I have a folder within the XCode project with all dependencies.
Then... on project build settings I setup header search paths-- and library search paths. To point that folder
Headers for SuperLU are found correctly... but I get Linker errors.
So as you can see, I have no idea what to do... I'm Sorry but as I told on beginning I'm a newbie adding libs into XCode... plus documentation of procedures it's not good at all. So if anybody could help me with some guidance or links where I can start understanding how the linking process works would be great.
I'm a little desperate at this point, os any kind of help would be really really great.
Thanks a lot.
The problem is that both SuperLU and Objective-C define YES and NO. So you get a conflict.
In the end I was advised to create a different target to compile all SuperLU as a pure c++ project with gcc compiler. That made it possible for iOS app to use the lib as a dependency.
I'm working on a project using C++, Boost, and Qt. I understand how to compress single files and bytestreams using, for example, the qCompress() function in Qt.
How do I zip a directory of multiple files, including subdirectories? I am looking for a cross-platform (Mac, Win, Linux) solution; I'd prefer not to fire off a bunch of new processes.
Is there a standard way to combine bytestreams from multiple files into a zipped archive, or maybe there is a convenience function or method that would be available in the Boost iostream library?
Many thanks for the assistance.
Update: The QuaZip library looks really great. There is an example in the download package (in the "tests" dir) that shows very clearly how to zip up a directory of files.
Update 2: After completing this task on my Linux build environment, I discovered that QuaZip doesn't work at all with the Visual Studio compiler. It may be possible to tackle all those compiler errors, but a word of caution to anyone looking down this path.
I have found the following two libraries:
ZipIOS++. Seems to be "pure" C++. They don't list Windows explicitly as a supported platform. So i think you should try your luck yourself.
QuaZIP. Based on Qt4. Actually looks nice. They list Windows explicitly (Using mingw). Apparently, it is a C++ wrapper for [this] library.
Ah, and of course, i have ripped those sites from this Qt Mailinglist question about Zipping/Unzipping of directories :)
Just for the record...
Today, I needed to do something very similar in Visual C++. (Though wanted to maintain the possibility to compile the project on other platforms; however preferred not to adopt Qt just for this purpose.)
Ended up using the Minizip library. It is written in plain C, but devising a simple C++ wrapper around it was a breeze, and the end result works great, at least for my purposes.
I have built a wrapper around minizip adding some features that I needed and making it nicer to use it. Is does use the latest c++11 and is developed using Visual Studio 2013, so it should work out-of-the-box for you.
There's a full description here: https://github.com/sebastiandev/zipper
you can zip entire folders, streams, vectors, etc. Also a nice feature is doing everything entirely in memory.
Poco::Zip is also a choice, it has clearly documentation and some code for demo.
Poco::Zip Document
system("zip myarchive.zip *");
I tried QuaZIP 0.4.3 on Windows with VisualStudio 2010 -- there are still issues but can be resolved easily.
To build with VS:
Use CMake to configure and generate VS solution for QuaZIP.
Open soltion with VS and build -- you'll first notice that it can't find 'zlib.h'.
Open preferences for quazip project and add path to Qt's copy of Zlib to C/C++->General->Additional Include Directories: $(QTDIR)/src/3rdparty/zlib.
Rebuild again and you'll get lots of warnings and one error C2491: dllimport static issue on QuaZipFile::staticMetaObject.
This is because QuaZipFile is declared like "class QUAZIP_EXPORT QuaZipFile" and QUAZIP_EXPORT needs to resolve to Q_DECL_EXPORT for dll and to Q_DECL_IMPORT for application, based on whether QUAZIP_BUILD is defined or not. When building QuaZIP QUAZIP_BUILD should be defined but isn't -- configuration process defines in error completely useless "quazip_EXPORTS" instead.
To fix, just remove "quazip_EXPORTS" from all build configurations and add QUAZIP_BUILD instead -- QuaZIP will now build fine.