I have been trying to get one Nsight project (project 1) to use some files from another Nsight project(2), and for the life of me can't get the project 1 to build!
I have tried referencing/setting include paths/building project 2 as lib etc but nothing lets me build project 1 without encountering some kind of error. At the moment I have reference project 2 and get "No rule to make target" error.
What is the best way (bar copying and pasting the source files) to include files from one project in another.
Thanks
Sam
This writeup demonstrates
how to include a file from one project into another (the test8lib.h header
file from the library project is being included into the main project)
how to make one project link to a library produced in another project. (the library produced in the library project is linked into the main project).
Related
Being new to making/using libraries, I followed a simple tutorial to build a static library in Visual Studio (2022). I made a solution with 2 projects in it. One that builds a library and one that uses the library. It worked. Then I made an independent project / solution to see if I can use this library independently from the original solution/projects. I put the lib file and hpp/cpp file into new separate folders and set these folders in project properties (Additional Include and Library Directories + the .lib file).
Problem: I could use the functions from the library in this new project but when I tried to step into it with the debugger, the cpp file it stepped into was from the original project. (that's what the path showed anyway.) When I renamed the old project and tried again, VS complained that the file directory has changed and asked me to set the path to it. I did set it to the newly made directory with only the hpp/cpp in it and it was fine. I made another new project for using the library and tried the whole thing again and then the debugger simply could not step into the function, it stepped over it.
My questions: what was going on here? how did the debugger find the original cpp file when Im positive I did not set that path anywhere in the new project? and how do I debug a static library then? Is putting the cpp file next to the header in the include directory not enough?
I have been successfully testing an image processing library (https://github.com/libvips/libvips) in a C++ project in VS2017. I am new to C/C++ and I have been following the documentation here which describes the C way of using the library. There are features I would like to try in the C++ API, but the C++ API needs to be built with the same compiler as my project. According to the author:
It's slightly awkward to set up under Windows. The problem is that C++
does not have a ABI, so you must use exactly the same C++ compiler for
your whole project. This means the libvips C++ win binary (built with
g++) won't work with MSVC C++.
You need to copy the libvips C++ API source code into your own project
and build it with your own code. It's just a few files and pretty
simple to incorporate:
https://github.com/libvips/libvips/tree/master/cplusplus
I have made several attempts to build the minimal set of files but I have not had any success.
My steps so far:
Create a C++ console app in VS2017, set to Debug and x64
Extract the 'vips-dev-8.10' folder from vips-dev-w64-all-8.10.6.zip to where the project file is (this contains all the built .dll files, .lib files, .h files etc.)
Extract 'cplusplus' folder from 'libvips-master.zip' to where the project file is (this has all the project source files including the cplusplus folder which is the part I have to build per the above explanation)
Add the following folders to Project > Properties > C/C++->General > Additional Include Directories
C:\Projects\ConsoleApplicationVIPS3\ConsoleApplicationVIPS3\cplusplus\include\vips
C:\Projects\ConsoleApplicationVIPS3\ConsoleApplicationVIPS3\vips-dev-8.10\include
C:\Projects\ConsoleApplicationVIPS\ConsoleApplicationVIPS\vips-dev-8.10\lib\glib-2.0\include
C:\Projects\ConsoleApplicationVIPS\ConsoleApplicationVIPS\vips-dev-8.10\include\glib-2.0
Add the 5 .cpp files from the cplusplus folder into the project Source Files folder and Add them in the project tree.
Build the project.
As a result I get the following errors:
I haven't written any code yet. I thought I should just be able to point to the .h include files and compile the required C++ files. It's not clear to me what else I might need to add, but it definitely seems like I don't understand the correct procedure to build the project. I watched some videos on C++ compilation like this one but I cant see where I went wrong.
Any thoughts would be much appreciated.
EDITS 3-Jun-21
I have made some changes. I have instead extracted the exact version of the library according to the suggestion by #Frank, and I also discovered the usefulness of the compiler output window, thanks #Alan Birtles.
I am still getting errors, but I am not clear why. The first error is:
E0020 identifier "VImage" is undefined
Which is odd because I have added the folders to Project > Properties > C/C++->General > Additional Include Directories, and one of them is ..\cplusplus\include\vips which contains VImage8.h
And the Output window shows
Any further advice would be appreciated!
I'm trying to integrate in a pre-existing code a third part library which have been given to me with three files (.dll, .lib and .exe) plus a header file .h .
I tried the following steps:
- include the header file adding also the directory in the include directories
- add the library .lib to the linker inputs additional dependancy
- move everything to the same folder of the solution
I'm using visual studio 2017. and all the code seems to compile with no errors, but when I try to access the functions of this library I got a message saying definition not found. Unfortunately I would like to access them to use only part of code that I need not the entire function.
Do I forget something / have to do something else?
The steps for integration third-party dynamic libraries with VC++:
1) Change project configuration linker settings to dynamic runtime ( /MD )
2) Confirm platform of the third party (x86 / x64) and set accordingly in the vc++ project.
3) Include the header files. No compilation errors means that the header files are correctly included by the compiler.
4) Include the *.lib with path in the additional libraries; once correctly set, the project will build successfully. Failing this step will give you - 'symbol not found', 'definition not found', and linker errors
5) Copy dll files to your application folder, failing which the .exe will not launch. The dll files also has to conform to x86/x64 the project architecture/
I've been programming in Python for over a year now but am just learning C++ and am unfamiliar with how to go about using external libraries, CMake and github for that matter. I'm trying to use an external library called cpr - https://github.com/whoshuu/cpr. So far I've followed the instructions in the 'Usage' section of that link up to, but not including, the "add_subdirectory(cpr)" bit.
So far I've got the source code for cpr in the Visual Studio project folder of my C++ project. In the project properties I've then added into Include Directories (under VC++ Directories) "$(SolutionDir)site_libs\cpr\include" and I've added the same thing into Additional Include Directories (under C/C++ -> All Options). This means that the following code compiles just fine:
#include <cpr/cpr.h>
int main(int argc, char** argv) {
auto r =
cpr::Get(cpr::Url{"https://api.github.com/repos/whoshuu/cpr/contributors"},
cpr::Authentication{"user", "pass"},
cpr::Parameters{{"anon", "true"}, {"key", "value"}});
r.status_code; // 200
r.header["content-type"]; // application/json; charset=utf-8
r.text; // JSON text string
}
However this code isn't working when it comes to building, due to link errors. I'm pretty sure the thing I'm missing is the actual .lib file for it to find where these functions etc are defined (nothing for cpr is set in the Linker -> Input property). So I'm wondering - how do I create this .lib file / is that even the right thing to do / what is this "add_subdirectory(cpr)" and where/how do I run it... basically what do I do to make this whole thing work..?! I've tried compiling cpr with CMake but it throws a load of errors about 'CMakeLists.txt' not present in certain folders.
Apologies if I've used any incorrect terminology here, only been learning C++ for a couple of days now. Any help massively appreciated!
If the library does not come as a binary distribution (that is with the .lib already built) you are going to need to build it as a separate project from the code you want to use the library, that step will build the .lib file. If a .sln is included with the distribution use that otherwise you may well have to create your own (or add it as a project to an existing solution).
Once you have a .lib add the directory under the VC++ directories of the project settings and add the actual .lib file name under Linker->Input on the Additional Dependencies line.
To build the library if the distribution does not include the needed VS files you will need to create a project at minimum (it can be part of the solution for your program), right click on the solution node in solution explorer and select Add->New Project, from there select Visual C++->Windows Desktop and either Dynamic Link Library or Static Library as you desire.
Go to the Project menu and select Project Dependencies, change your program to depend on the new project, this will set build order so your program project builds after the library.
You may need to disable the use of pre-compiled headers, right click on the new project node select Properties, go to C/C++->precompiled headers and change Precompiled Headers->Precompiled Header to Not using precompiled headers.
Next add the header and source files to the project and attempt building.
If this succeeded you will have a .lib suitable for use in the additional dependencies of your program project as already described.
I am in the process of porting my c++ engine to mac, and so I used premake to generate an xcode project, which it does fine.
Box2D is built into the engine and one of its files "b2Broadphase.h" is including algorithm from the c++ standard library.
This is giving these errors: ::clock_t has not been declared and so on for all the using commands in the ctime file.
I cannot figure this out because when using premake to build a make file it runs fine and build a perfect library on OSX. Its only Xcode giving these errors.
My guess is that Xcode has not been configured to include the implementation files (.m or .cpp) or it has not been configured to link against a library which you are using. In general, you need to do two things: 1. include the headers 2. link against the libraries with the actual executable objects.
In Xcode, you do this by selecting the project (top-most item) in the file-browser panel on the left, and there is a section in the main area to choose which libraries to link to. You must specifically tell it to link against whichever libs you are using, even if you have imported their headers.
For .cpp or .m implementation files, you need to tell it to include that file in the target for compilation. This can be done either in the build settings (similar place to the lib inclusion) or else when you have a file selected, the inspector panel on the right has a little area for you to choose which targets to include the file in. (you only need to "include" implementation files like this, not .h files)