Compiling in OpenCV

Question

Every time I try to compile this code in OpenCV, I keep getting this error. All I want to do is create a window:

//#include <iostream>
//#include <stdio.h>
#include "highgui.h"

int main() {
    int cvNamedWindow(const char* name, int flags = CV_WINDOW_AUTOSIZE);
    {
        cvNamedWindow("sample");
    }
    cvDestroyWindow("sample");    
}

However I'm getting this error:

window.cpp:4:21: fatal error: highgui.h: No such file or directory

I have checked in the necessary folder and highgui.h is very much installed.

Any help?

Your compiler has a list of directories called "Include directories", where it will search for the header files. You need to put OpenCV's include directory in that list. Otherwise the compiler won't fint the header. — M456
– M456, Commented Feb 2, 2013 at 19:24
I'm using the 'g++' compile command. What would the compile folder be called? — user2035796
– user2035796, Commented Feb 2, 2013 at 19:32

Froyo · Accepted Answer · 2013-02-02 20:12:12Z

1

Include files as following

#include "opencv2/highgui/highgui.hpp"

And compile the file

g++ -ggdb `pkg-config --cflags opencv` filename `pkg-config --libs opencv`

answered Feb 2, 2013 at 20:12

Froyo

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4 Comments

user2035796 Over a year ago

Getting this error:window.cpp:5:41: fatal error: opencv2/highgui/highgui.h.hpp: No such file or directory compilation terminated.

Froyo Over a year ago

What platform are you using? Windows or Linux? How did you install OpenCV? through package manager or compiled it?

Froyo Over a year ago

can you check /usr/local/lib and /usr/lib for OpenCV files?

user2035796 Over a year ago

I'm using Ubuntu 12.04 and i have checked both directories and the opencv files are there

TOTA · Accepted Answer · 2013-02-02 20:16:13Z

1

If you have the OpenCV include as part of the include path, it should be

#include "opencv/highgui.h"

or

#include "opencv2/highgui/highgui.hpp"

depending on you using the c or c++

answered Feb 2, 2013 at 20:16

TOTA

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3 Comments

user2035796 Over a year ago

i'm using C, so the first one?

user2035796 Over a year ago

Grrr even after showing using this compile command g++ -o window window.cpp -I/usr/include/opencv I'm now getting this error!: window.cpp:(.text+0xf): undefined reference to cvNamedWindow' window.cpp:(.text+0x19): undefined reference to cvDestroyWindow'

TOTA Over a year ago

The unnamed references is because the linker can't find the library or you're not telling which library to use, mainly "opencv_highgui243d.lib". Currently using windows and not linux. But works when I add the following libraries. opencv_core243d.lib, opencv_highgui243d.lib, comctl32.lib, zlibd.lib

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