i have installed OpenCV 3.10 and the linked the opencv_world310.lib to release and opencv_world310d.lib to debug.
Moreover I put the compiler options in search directory to ...opencv\build\include. I got a undefined reference error when i left out #include <opencv2/highgui.hpp. Now that i have included it my code looks like this:
#include <stdio.h>
#include "opencv/cv.h"
#include "opencv/highgui.h"
#include <opencv2/highgui.hpp>
int main(void){
printf("HALLO!");
return 0;
}
When i try to build it core.hpp opens and the error: core.hpp must be compiled in C++ occurs.
I am using the GNU GCC Compiler in Codeblocks.
What should i do to solve the problem?
Check you compiler options. Open CV 3.10 C++ API requires code to be compiled as C++, but not C. You can use answer to "CodeBlocks: change project language c and c++" question to change the options.
Also use the new Open CV 3.10 API
#include <opencv2/opencv.hpp>`
instead of all the other Open CV header files. This header includes core functionality. To enable highgui module you need to define HAVE_OPENCV_HIGHGUI in your project settings.
Related
Netbeans fails compilation on:
#include <string>
Output says:
main.c:10:18: fatal error: string: No such file or directory
#include <string>
The previous two declarations are included fine:
#include <stdio.h>
#include <stdlib.h>
I have removed all the code afterwards to make sure.
I am using cygwin_64 and it installed as per Netbeans c++ installation manual and shows versions in CLI
I am new to C++ and I know there have been similar questions, but the answers didn't help me.
Just try to create new project and follow these steps:
Click File->Create project.
Choose C/C++, then C/C++ application, click Next.
Enter project name and in the right choose C++ in combobox. Or C++11.
This is a really basic question because I am a C++ newbie. I want to use the Boost.Interprocess library, but am having trouble building it. I'm trying to follow these instructions, but it's not working for me. Here is what I have:
#define BOOST_DATE_TIME_NO_LIB
#include <boost/interprocess/shared_memory_object.hpp>
#include <iostream>
using namespace std;
int main() {
cout << "Hello, beautiful world!\n";
}
But I get this error:
boost_1_55_0\boost\date_time\gregorian_calendar.hpp(63) : fatal error C1083: Cannot open include file: 'boost/date_time/gregorian_calendar.ipp': No such file or directory
I know Boost is able to load properly, because I can get an example that uses #include <boost/lambda/lambda.hpp> to work just fine. It's just when I try to include the Boost.Interprocess library that I am having trouble. The cause is clearly because it's having trouble including the Boost.DateTime library properly, but according to the documentation (linked above) I should be able to get by without separately compiling Boost.DateTime if I define BOOST_DATE_TIME_NO_LIB, right?
What am I missing here?
You need to add it to the preprocessor
In VS go to - Project >> properties >> C/C++ >> Preprocessor in the 'Preprocessor Definitions' paste BOOST_DATE_TIME_NO_LIB.
You can download boost libraries here: https://www.boost.org/users/download/
After that, you can include them in your projects. Also, you can check this video on how to add boost libraries in eclipse IDE on Ubuntu: https://www.youtube.com/watch?v=gN8zrnWxFeI
Error: cannot open source file "GL/glew.h"
I have the following code :
//Include GLEW
#include <GL/glew.h>
//Include GLFW
#include <GLFW/glfw3.h>
//Include the standard C++ headers
#include <stdio.h>
#include <stdlib.h>
//Define an error callback
static void error_callback(int error, const char* description)
{
...
I took from there: http://www.41post.com/5178/programming/opengl-configuring-glfw-and-glew-in-visual-cplusplus-express#part4
In order to have a somewhat portable solution, before I even started Visual Studio 2013 I created two System Environment Variable in windows.
GLEW=C:\Install\Development\C++\Framework\glew-1.10.0-win32\glew-1.10.0
GLFW=C:\Install\Development\C++\Framework\glfw-3.0.4.bin.WIN32\glfw-3.0.4.bin.WIN32
So in my project I could for instance write a additional include folder as: %GLEW%\include
As I said, it builds fine and runs fine as well.
Yet, not having intellisense behave properly is really annoying.
How to fix it?
My syntax was actually wrong, you cant use global environment variable in VS using %<name>% but you have to use $(%<name>).
Wherever I wrote %GLEW%\include I should have $(GLEW)\include.
It's working fine now.
Though I'm completely clueless why it built.
This post: https://stackoverflow.com/a/11543754/910813 got me to remind that.
I am trying to build a C++ app that uses both websocketpp and MySQL. I have encountered 2 build problems using VS 2010 C++ Express.
1) A problem with the boost libraries. It produces many errors like this:
1>c:\program files (x86)\boost\boost_1_50\boost\thread\win32\thread_data.hpp(210): error C2146: syntax error : missing ')' before identifier 'rel_time'
Here's the relevant snippet from thread_data.hpp starting with line 210:
inline BOOST_SYMBOL_VISIBLE void sleep(TimeDuration const& rel_time)
{
interruptible_wait(detail::pin_to_zero(rel_time.total_milliseconds()));
}
2) A conflict with the word VERSION which is documented here and I believe is independent.
To make a clear and simple example of the boost build problems, I'm using the websocketpp example: echo_server.cpp to which I added these includes:
#include "stdafx.h"
Boost lib includes recommended by "Building a program with websocketpp" on the websocketpp site.
#include <boost/regex.hpp>
#include <boost/random.hpp>
#include <boost/system/api_config.hpp>
#include <boost/system/config.hpp>
#include <boost/system/error_code.hpp>
#include <boost/system/system_error.hpp>
#include <boost/system/windows_error.hpp>
and the MySQL header includes. Adding these 2 boostincludes triggers the build errors. If I comment out these 2 includes, it builds without errors:
#include <my_global.h>
#include <mysql.h>
Any suggestions on how to deal with the boost problems?
I don't think this is the same build problem as this one, "Trying to build websocket++ with MinGW: last few linker errors — what could it be?"
Concerning the first error, check if there are any macros interfering with the code. Right-click and go to definition or #define the macro yourself at the beginning of the file and see where it gets redefined. In really hard cases, look at the preprocessor output via a compiler flag.
Concerning the rest, you don't provide any versions for Boost and MySQL. Then, there is my_global.h (or is that part of MySQL?) and stdafx.h, which are both under your control but you don't show them here. Also, try to reduce the issue to the smallest possible piece of code. In short, provide a reproducible example.
I have a C++ class that compiles fine on linux with gcc and on widows in visual studio.
boid.h:
#ifndef BOID_CLASS_HEADER_DEFINES_H
#define BOID_CLASS_HEADER_DEFINES_H
#include "defines.h"
class Boid {
public:
// Initialize the boid with random position, heading direction and color
Boid(float SceneRadius,float NormalVel);
.....
protected:
...
};
#endif
and in boid.cpp:
#include "Boid.h"
// Initialize the boid with random position, heading direction and color
Boid::Boid(float SceneRadius,float NormalVel)
{
....
}
However, I get the following error when I compile this code in Xcode:
Compiling Boid.h: "error: vector: No such file or directory"
Any ideas? I thought you could take C/C++ code and compile it in Xcode without issues?
Thanks
EDIT: Added defines.h (also added #endif to sample, but that was in the original code)
EDIT 2: I am getting a different error after a commenting out a couple of includes there were empty: the vector error above.
#ifndef BOID_NAV_DEFINES_H
#define BOID_NAV_DEFINES_H
#include <stdlib.h>
#include <vector>
#include "Vector3d.h"
#include "Point3d.h"
#include "win_layer.h"
#endif
Are you including the C++ header in a .m file?
.m files are treated as .c files with Objective-C extensions.
.mm files are treated as .cpp files with Objective-C extensions, then it's called Objective-C++
Just rename any .m file to .mm, right-click or ctrl-click and select rename on the file in Xcode.
Without changing any .m to .mm or anything like that, if you click your project, click tagets->build settings
go all the way down to "LLVM GCC 4.2 - Languages" (new xcode says "Apple LLVM compiler 4.2") you will see Compile Sources As change that value to Objective-C++;
I hope this will help.
After updating xCode to version 10, I have had issues including < map > and < vector > libraries. Found an easy solution by changing the C++ library type in the project's build settings (target's Build Settings):
C++ Standard Library: libc++ (LLVM C++ standard library with C++ 11 support)
Compiled without any problem.
Make sure you're compiling it as C++. Right click the file in XCode and select Get Info and make sure that File Type is set to sourcecode.cpp.cpp for the implementation files.
Assuming you're talking about the OS X XCode, that uses gcc to do the actual compiling. So there should be no difference between that and Linux, other than maybe different versions of gcc.
First thing that jumps out at me here is that you've typed "boid.h" as the name of the file, but you're including "Boid.h". Assuming that's not a typo, I would expect that to cause trouble on both Linux and OS X....
Edited to answer the new question: Hmmm... vector is definitely part of Xcode: /Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/vector on my machine.
Further thought: If you port the source and makefiles from the Linux build over to the Mac, you can probably just compile it from the command line exactly like you do on Linux....
Definitely, something in defines.h is affecting the class definition.
This issue had two errors:
one of my includes had a typo which caused a compile error
the vector not found error was fixed by the .m files to .mm
Not sure if you forgot to paste, but you have an unterminated #ifndef
What's inside defines.h ?
Edit: You seem to have found the solution. One more remark:
#include <stdlib.h>
For C++, please:
#include <cstdlib>
:D