I have a problem regarding including files that are outside project directory (c). So I have a project in a workspace. There is a folder somewhere on my hard drive, containing a pair of .h and .c files. I would like to use them in several projects, that's why I wanted to place it outside the project.
I tried including this folder, .h file actually in many ways, but the compiler doesn't seem to see the content of it. I can successfully include the file, but the functions inside are not visible.
In the properties of the project -> C/C++ General -> Paths and symbols I have added the folder. What else should I do?
Add the relative path of all those *.c and *.h file.
#include "path_to_header/lib1.h"
#include "path_to_file/file1.c"
I was wondering about the same recently, here is what worked for me:
You have to mark the files as source code. Open project properties dialog and go to source location tab
then you can use Link Folder to select absolute path or you can use the variables to keep it relative to project file or workspace.
For other configurations Add folder was enough since they were already linked.
You also need to add include paths to c or c++ here
There probably already are some default paths so just add the new ones.
It can also be relative using variables.
I had more sub folders so I added them individually and did not use and relative path in #include at all.
Related
I cloned a github C++ repository. The repository is not a VS project. So I manually created a VS C++ blank project and added the files from the repo to the project. The files are not copied. This is not the problem.
The repo directory looks like this:
include\NTL\*.h
src\*.cpp
*.h means a bunch of header files and *.cpp means a bunch of .cpp source files.
The problem is that the .cpp files have #include <NTL/*.h> and when I build, VS fails to locate the header files (No such file or directory). Adding the path to the include to the Include Directories in project properties didn't help.
EDIT: After some experimenting, I've found that the error has nothing to do with the prefix NTL in #include <NTL/*.h> but with whether the files are copied into project directory. Even though the files appear in VS project view, they must be copied into the project directory.
EDIT: The only way I've managed to get the project to compile is to put the whole NTL directory containing header files in project directory. Include Directories and Additional Include Directories in project properties don't seem to have any effect.
All previous No such file or directory errors were the result of some combination of:
Mismatching project properties Configuration and Platform
Some .h files were actually missing from NTL github repo, e.g. mach_desc.h.
The solution to the problem consists of the following:
Under project Properties > C/C++, add the path to the include to Additional Include Directories.
VS project has a separate set of properties for each combination of Configuration and Platform. Make sure that step 1 applies to the active Configuration and Platform. E.g. If the project's currently configured to build for Debug x64 (active Configuration:Debug and Platform:x64), make sure that step 1 applies to Debug x64, and not something like Release Win32 or Release x64, etc.
Use the Windows/Linux-specific zip package from the Downloads page of the official website https://libntl.org/download.html
I am having an issue including files outside my project directory. I have a project in eclipse with some header files outside of the project that need to be linked to my project. I have added the path to C/C++ General for the header files and included them in my code. It seems like only one of the files can be seen and the other file I am getting an unresolved inclusion error. Does anyone know how to fix this?
The following is thanks to comments from #user7860670 -- you can see more commentary in eclipse: including a path outside of the project
Short form:
Use system variables.
For include directories relative to your workspace, use something of the form "${workspace_loc}/../my_includes".
For include directories relative to your project, use something of the form "${project_loc}/../my_includes".
Note that in some IDEs, the system variables may be named differently.
See eclipse: including a path outside of the project for more details.
I use XCode 5.1 for C++ development. I have existing code which I add to the project by dragging files from Finder. The project shows all necessary .h and .cpp files. But when I click Build Phases->Compile Sources, I only see sources that from the root directory in my source structure. None of the source files from subdirectories appear in the Compile Sources. Why? And how to fix this?
Also, when I try to add the missing .cpp file from Build Phases->Compile Sources by pressing +, XCode does not expand the subdirectories, so I cannot select the missing .cpp files.
This is unbelievable. The only problem was that I was adding folder structure with Create folder references for any added folders option instead of Create groups for any added folders.
But still don't understand what is the difference in terms of recognition of source files.
Other peculiarity is that you should add resource files in opposite way (Create folder references for any added folders). Otherwise the iOS application does not find the files and does not compile.
I have been trying linking of a .lib file and also including a header file in my C++ console application project. I copied the C++ header file from one of my other projects, and pasted it under Header Files folder in console application project. Here's the screenshot to see: http://i.imgur.com/JFFIn.png
However, when I try to include the header in my code as #include..., I do not get an intellisense with my header file's name. (I only see targetver.h, stdafx.h and Debug folder)
I tried to point Add additional include directories in my C++ console application project properties to the Project folder itself, but that doesn't seem to help and the file still doesn't show up.
If I write the name of the header file as #include "DllTest.h", I get an error saying: Cannot open include file: 'DLLTest.h': No such file or directory c:\users\ht\documents\visual studio 2010\projects\dlltest\dlltestconsole\dlltestconsole.cpp
How is the header file included in here, so that it starts appearing? If I add a new item > Header File, name it to DLLTest.h and copy paste the header files content here, it just shows up normally. How will the header file which is copied - pasted into Header Files folder show up in the code?
In C++ projects, the things that look like folders in the Solution Explorer aren't actually folders, they are filters. They are UI-only entities that can be used to organize project items in the IDE. They do not in any way reflect the structure or location of items on disk, though. You can add a file from any location on disk to any filter in the solution.
The compiler knows nothing of these filters; it only knows about files as they exist on disk.
In your case, the files are not located in your project folder. You'll either need to:
copy your files into your project folder, then add them to the project from there (right-click on the solution then Add Existing Item), or
add the files from where they are, then add their location to the "Additional Include Directories" property in the project properties.
I do not know of any way to have the IDE automatically move files to the project directory when you copy and paste them into the project. The C++ project system is fundamentally different from the project system used for C# and VB.
I have had C++ experience but not MSVC.
What I am trying to do is incorporate a .dll from an open source project into my project. The code is available and I have built it. I have the .dll as well as the .lib which as I understand it is required for C++ projects.
Now unfortunately there is no simple "Add Reference", drop my .dll into an include directory and add that to my solution. I have edited the project property pages, the C/C++ Additional Include Directories option as well as adding the .lib as an additional linker dependency. I have created an include directory for the dll and lib inside my solution tree.
My problem is when I try to include the header files from the documentation, VS output spits out error messages. Now I realize that I am using the dll/lib combo and that the .h files are not present in my solution so how do I add the proper includes? I am using QT toolkit also which is working but how I add the other header / dll from the open source library eludes me.
Can someone please point me in the right direction.
You need to do a couple of things to use the library:
Make sure that you have both the *.lib and the *.dll from the library you want to use. If you don't have the *.lib, skip #2
Put a reference to the *.lib in the project. Right click the project name in the Solution Explorer and then select Configuration Properties->Linker->Input and put the name of the lib in the Additional Dependencies property.
You have to make sure that VS can find the lib you just added so you have to go to the Tools menu and select Options... Then under Projects and Solutions select VC++ Directories,edit Library Directory option. From within here you can set the directory that contains your new lib by selecting the 'Library Files' in the 'Show Directories For:' drop down box. Just add the path to your lib file in the list of directories. If you dont have a lib you can omit this, but while your here you will also need to set the directory which contains your header files as well under the 'Include Files'. Do it the same way you added the lib.
After doing this you should be good to go and can use your library. If you dont have a lib file you can still use the dll by importing it yourself. During your applications startup you can explicitly load the dll by calling LoadLibrary (see: http://msdn.microsoft.com/en-us/library/ms684175(VS.85).aspx for more info)
Cheers!
EDIT
Remember to use #include < Foo.h > as opposed to #include "foo.h". The former searches the include path. The latter uses the local project files.
The additional include directories are relative to the project dir. This is normally the dir where your project file, *.vcproj, is located. I guess that in your case you have to add just "include" to your include and library directories.
If you want to be sure what your project dir is, you can check the value of the $(ProjectDir) macro. To do that go to "C/C++ -> Additional Include Directories", press the "..." button and in the pop-up dialog press "Macros>>".
You mention adding the additional include directory (C/C++|General) and additional lib dependency (Linker|Input), but have you also added the additional library directory (Linker|General)?
Including a sample error message might also help people answer the question since it's not even clear if the error is during compilation or linking.