Trying to build a test with Opencv and QT

Question

Recently build OPENCV 3.4.3 with CMAKE 3.12.4 and MINGW64(32bit) 8.1.0 in Windows 7. Have QT 5.6 and i trying to test this build as QT Console App, but when i compiling with QT only get the message "Press "RETURN" to close this window...".

.PRO file:

CONFIG += c++11
TARGET = test
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
OTHER_FILES += test.png
INCLUDEPATH += C:\Users\Test\Desktop\opencv\build\include
LIBS += C:\Users\Test\Desktop\mingw\bin\libopencv_*.dll

main.cpp:

#include <QCoreApplication>
#include <iostream>
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv/cv.h"

using namespace std;

int main(int argc, char *argv[]) {
    QCoreApplication a(argc, argv);
    cout << "Hello World!" << endl;
    cv::Mat mat;
    mat = cv::imread("test.png");
    cvNamedWindow("hello");
    cv::imshow("hello",mat);
    return a.exec();
}

What im doing wrong?

The usual problem -- `imshow` without `waitKey`. – Dan Mašek Nov 12 '18 at 16:34 — Dan Mašek, Nov 12 '18 at 16:34

score 2 · Accepted Answer · answered Nov 12 '18 at 13:29

2

Imo the problem is not in your code, I just run it (using Qt5.5, Win10, openCV 4 and mingw64), even if I had to change cvNamedWindow to cv::namedWindow. I have two hints:

did you build openCV with mingw64? If not, do so.
are the openCV dlls in the path when you run the application? You can also copy all opencv dlls in the program folder to check that quickly...

answered Nov 12 '18 at 13:29

L.C.

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21

Omg i forgot that x.x now, it works i get this error. "error assertion failed (size.width 0 && size.height 0)" but i resolve it with this: https://stackoverflow.com/questions/31341845/opencv-error-assertion-failed-size-width0-size-height0-simple-code thanks!!!! – Siewdass Sf Nov 12 '18 at 14:12

Trying to build a test with Opencv and QT

1 Answers1