Linking OpenCV 3.2.0 library with Qt 5.4

Syazwany

I had downloaded the libraries for OpenCV and wanted to connect it to Qt for my project. I am doing this on Windows 10. I want to develop a GUI that would be able to upload and play video. But I have an error saying that "No such file or directory"

.pro file
INCLUDEPATH += C:/opencv-3.2.0-vc14/opencv/build/include/opencv2

LIBS += LC:/opencv-3.2.0-vc14/opencv/build/bin -libopencv_core -libopencv_imgproc -libopencv_highgui

header file
#ifndef DIALOG_H
#define DIALOG_H

#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
#include<opencv2/core/types.hpp>

#include <QDialog>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
Q_OBJECT

public:
explicit Dialog(QWidget *parent = 0);
~Dialog();

public slots:
void processFrameAndUpdateGUI();

private slots:
void on_btnPauseOrResume_clicked();

private:
Ui::Dialog *ui;

// Declare variables while linking them to opencv libraries

error message
error: opencv2/core/core.hpp: No such file or directory
#include<opencv2/core/core.hpp>
^

Syazwany

@mrjj Hey there. Thank you so much. That was the problem. I thought i built it.

It works now :)

SGaist

Hi and welcome to devnet,

Remove the opencv2 at the end of your INCLUDEPATH statement.

Syazwany

Hi @SGaist

Now this error appears
error: error: LC:/opencv-3.2.0-vc14/opencv/build/bin: Invalid argument

mrjj

@Syazwany
And you are using the same compiler for your app ?
(visual studio 2015 i think it is)

SGaist

You are missing a - before the L in your LIBS statement.

Syazwany

@mrjj Hi, I am using MinGW compiler. I am new to this and been dealing with this error for more than a week now :(

jsulm

@Syazwany As already mentioned you're missing - in front of L:

LIBS += -LC:/opencv-3.2.0-vc14/opencv/build/bin -libopencv_core -libopencv_imgproc -libopencv_highgui

Syazwany

@SGaist Still does not work, the same error :(

mrjj

Hi

But if you are using mingw compiler and that opencv-3.2.0-vc14 really sounds like visual studio compiler.

Are we not trying to use visual studio DLLS with mingw compiler ?

I assume you did not build openCV yourself but just downloaded and unpacked it ?

Syazwany

@mrjj Hey there. Thank you so much. That was the problem. I thought i built it.

It works now :)

Pablo J. Rogina

@Syazwany if your issue is solved, please don't forget to mark your post as such. Thank you