Xcode - header files issue with .cpp file - c++

I have imported my project from windows to mac and Is using xcode to compile the project.
I have managed to fix most error and bugs from the porting process but there is one bug/error I am unable to determine why its not working as it should. This probably due to my lack of knowledge of xcode but was wondering if anyone is able to help me with this problem.
The problem is this;
I have a two sub folders in my project, once called include and another called source. Of course include contains all the header files and source contains all the cpp files and such.
Example:
Root/
Include/
Header.h
Source/
test.cpp
Now in the build settings in the xcode project, I have added $(SRCROOT)/Include/ in the Header Serach Paths. So therefore I presume that xcode will include any header files in the Include folder.
So in the test.cpp class I add #include "Header.h". When I click build I get an error saying "'Header.h' file not found".
Im not entirely sure what I am doing wrong, of course I can do this for example - #include "../Include/Header.h" but that's going to be a pain going through all the cpp files in my project (which is a lot).
I was just wondering if anyone else came across this problem?
Thanks for reading.

In general you need to add the headers to the User Header Search Paths, which if you search the help in XCode will give you the format you need to pass the directory as.

Related

Custom precompiled headers causing compile errors

I am trying to introduce precompiled headers into my project because of long compile times in my project right now. I have a main project that includes a main function and all the real code is in the DLL project(they are linked together.) I named my precompiled header "vpch.h" and i created a vpch.cpp that includes vpch.h. I am using visual studio 2017 so I went into the properties of vpch.cpp and selected Create. Then I added vpch.h as the first thing in all my cpp files. All files are set to use precompiled headers and reference vpch.h Every CPP files throws the error:
Error C1010 unexpected end of file while looking for precompiled header.
Did you forget to add '#include "vpch.h"' to your source?
I am at a loss as to what to do because I have followed many tutorials and can't find a reason for this. As well as most issues that pop up on google are people just accidentally including precompiled headers.
My only thought is that maybe in the section in properties where it asks for the name of the precompiled header, I need to do more than put "vpch.h" and maybe an exact file location? Any help with this is super appreciated.
EDIT
From further debugging it would appear that all but ONE cpp file is throwing an error. The one that doesn't throw an error is the one that exists in the same exact folder as the vpch.h. So files that can't just write #include "vpch.h" and have to write something like "../vpch.h" I can write #include <vpch.h> and I am going to try that now but I am unsure that will help.
The issue was with every CPP file that wasnt in the same folder as the precompiled header.
So if you use a file structure that contains different classes in different folders, using
#include "../../vpch.h" will actually fail. You must add the root folder to your additional include directories and then use #include <vpch.h> for all files. I can NOT tell you why using #include "../../vpch.h" wasn't working. It seems counter intuitive for it to fail in my opinion.
It may be because it searches for the precompiled header in the same folder as the file you are referencing it in. This answer, however, will work as a solution.

No such file (header file) error

I want to include a header file. I am working in a C++ environment, (C++11, Windows OS, Netbeans 7.3.1 IDE, Cygwin_4.x tool collection). I do not know how I setup the environment/IDE (I did it 6 months ago). I do not understand the fundamentals of the C++ build process or Cygwin related issues either, so I might have to fill in the gaps with some other references/documentation (on what specifically, I'm not sure).
My ultimate objective is to be able to include header files using a syntax that does not require the full file path. I want to write something terse, like:
#include "src\stuff\blah.h" //or even better: #include "blah.h"
The only way I can get my program to compile at all is by using the full file path, like this:
#include "C:\NetBeansProjects\Project1\src\stuff\blah.h"
And, I can only compile once using the full path. If I try to rebuild, it will bomb with the *** multiple target patterns. Stop. error. There are workarounds for this error; those being either 1) deleting the build and dist folders between each rebuild (yikes?), or 2) following this 16 step setup process.
I do not want to follow either of those workarounds because they do not appear to deliver what I want. How can I setup my environment to achieve what I want...of being able to include header files without using full paths?
Thanks to DanielKO for this answer.
In my case, I was able to include with the syntax:
#include "../stuff/blah.h"
I did not have to configure anything under the "Code Assistance" section for the C++ compiler.
All of my code is under "src" as the parent directory in my NetBeans project. It seems that the full path of the file is not required, and the only directory that must be referenced is the lowest level subdirectory (in my case, "stuff").
In NetBeans I've added the path to the list of libraries:
Go to Properties->Select C++->Select 'include libraries'->'Add'
Now: Add the path of the project folder with option "absolute"
Go to Properties->Select C++->Select 'Additional library directories'->'Add'
Now: Add the path of the project folder with option "absolute"
It's very obscure to me why the project doesn't recognize "own" header files.

How to link and use OpenCV headers?

Right, I know this is a very stupid question, but I have no luck with w/e i'm trying to do.
I'm trying to use the objdetect.hpp header file, so I've included the folder C:\OpenCV2.1\include\opencv2\ aswell as C:\OpenCV2.1\include\opencv and a whole bunch of other libraries and dlls when I was following the instructions on http://opencv.willowgarage.com/wiki/VisualC%2B%2B_VS2010
But the openCV version in that tutorial were outdated and doesn't even have the objdetect.hpp file. So I went to download the latest one (OpenCV 2.4.0), but now when I complie it, it gives me an error C1083: Cannot open include file: "opencv2/core/core.hpp" No such file directory.
Am I suppost to put all the OpenCV folders/files in the same directory as my C++ project? Or how do I fix it? I've tried putting it in the same place as my C++ project, but when I do a #include "../" the folder doesn't appear.
Again, I know this is a stupid question, but please help.
Let me know if anyone require more info coz I'm not too sure whatelse to put.
Thanks
The best way to manage changing directories for include files is with the compiler options. Im better at linux and g++, where you would just specify different include path locations with -I attributes.
Its generally considered bad practice to use relative and absolute paths in the #include statements. Module paths are ok #include <sys/time.h>, where sys could be considered the module. Include the file with just its name and possibly the module, then handle the location with the compiler options.

Question about C++ folder structure for header file

I'm quite new in C++ after few years in Java and eclipse, I got little bit confusing using code::blocks, no autogenerate setter/getter and also implement interface :D.
I wanna ask about code structure in code::blocks, I create new console application, my header will be put to Headers/include folder called Employee.h, then .cpp will be put to src folder.
Now I create main class (I put outside of src folder) who will call the header, I just append the include code like this :
#include "Employee.h"
sure then the errors appeared after compiling:
error : Employee.h: No such file or directory.
how to link the header to the main class properly?
this is my folder structure :
updated :
It works, my include folder needs to be added on build options.
Really thanks
You need to add your include directory to your compiler's include path. This is going to be compiler-specific. e.g., if your structure is:
code
code/src
code/include
and you're running g++ from a terminal in the 'code' directory, you'd need to run (assuming your .cpp is Employee.cpp):
g++ -Iinclude src/Employee.cpp
I suspect you're running some sort of IDE, though: if so, do a search in its help for "include path" and it should tell you how to set it up correctly.
If you want to include your employee.h you must #include "employee.h" not Employee.h. Those are two different files.
You shouldn't be adding include paths to your build options for header files that are actually part of your project. It didn't find the header file from the EmployeeTest.cpp because you didn't use the full relative path.
You need:
#include "include/Employee.h"
You should only be adding include paths to your compiler for additional libraries that aren't added to the typical /usr/local/include or /usr/include directories.

Xcode cannot find #Include<> header

I'm trying to get Xcode to import the header file for Irrlicht.
#include <irrlicht.h>
It says "Irrlicht.h. No such file or directory". Yes Irrlicht.h with a capital I, even though the #include is lowercase.
Anyway I added "/lib/irrlicht-1.6/include" in the header search paths for the Xcode project, yet it still doesn't find it.
The only thing I've tried that does work is:
#include "/lib/irrlicht-1.6/include/irrlicht.h"
This is a bit ridiculous though, #include should work, I don't understand why it isn't working.
Update (here are more details on the error):
/lib/PAL/pal_benchmark/palBenchmark/main.h:31:0
/lib/PAL/pal_benchmark/palBenchmark/main.h:31:22: error: irrlicht.h: No such file or directory
I figured this out. Perhaps someone can comment as to why this is the case.
The Header was located in this directory:
/lib/irrlicht-1.6/include/
If I added that path to: "Header Search Paths" Xcode still wouldn't find the path when I built the project.
Solution: Add the header path to: "User Header Search Paths" instead.
It boggles me why I had to do this, as I frequently add my header paths to "Header Search Paths" and then #includes just work. Hopefully this can help someone else who gets this same issue.
Both
#include <irrlicht.h>
#include "irrlicht.h"
should work as long as the "-I" argument to gcc includes the path of the directory enclosing the header file. If irrlicht.h is part of /usr/include the "-I" option is no longer required.
Rather than explicitly adding include paths to your project settings, an easier and more convenient solution for this kind of situation is to just drag the directory containing your .h files (/lib/irrlicht-1.6/include in this case) into the project files pane. This adds the headers to your project of course, and makes it easy to browse them and search for symbols, etc, and it also adds the directory path to gcc compiles, so that you don't have to manage include paths explicitly.
and furthermore, a flat file hierarchy isn't what you want. Dragging files into Xcode flattens your hierarchy. What about for example when you want to have multiple Targets, with a "TargetName/settings.h" file for that target. you'll have many settings.h files that you need to keep unique via its folder name.
I understand that this is an old post, but it does rank quite high on Google, so I thought I would add some information
Under XCode 3.2.6, I had an issue where XCode could not find a header file. It turns out that one of the filepaths included a space in it, and XCode interpreted it improperly.
For example: With a path like "Users/Username/Desktop/Project/Some Headers"
Here was the excerpt from the GCC Commandline: "-I/Users/Username/Desktop/Project/Some" "-I/Headers"
To see your build log provided by XCode, there is a good tutorial here: How do you show Xcode's build log? (Trying to verify if iPhone distribution build zip was created correctly.)