Realloc(): invalid pointer QT5.2 + OPENCV2.4.8 + UBUNTU13.10

[Welinton]

Hello! I'm new and I'm having trouble compiling a project QT + OpenCV + Ubuntu ...

I searched several forums and found nothing

.PRO
@
QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = TesteQT
TEMPLATE = app

INCLUDEPATH += /usr/local/include/opencv
LIBS += -L/usr/local/lib
LIBS += -lopencv_core
LIBS += -lopencv_imgproc
LIBS += -lopencv_highgui
LIBS += -lopencv_ml
LIBS += -lopencv_video
LIBS += -lopencv_features2d
LIBS += -lopencv_calib3d
LIBS += -lopencv_objdetect
LIBS += -lopencv_contrib
LIBS += -lopencv_legacy
LIBS += -lopencv_flann
LIBS += -lopencv_nonfree

SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui
@

MAINWINDOW
@#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFileDialog>
#include <opencv/cv.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}

MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::on_btProcurar_clicked()
{
cv::namedWindow("Disp");
cv::VideoCapture cap(0);
cv::Mat frame;
do{
cap >> frame;
imshow("Disp",frame);
}while(cv::waitKey(30)<0);
cv::destroyAllWindows();
}
@

When compiling the project with the error:

** Error in `/home/welinton/Documents/Projetos/QtProjetos/build-TesteQT-Desktop_Qt_5_2_1_GCC_64bit-Debug/TesteQT': realloc(): invalid pointer: 0x00007f6305316d80 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x7f4c6)[0x7f63043ff4c6]
/lib/x86_64-linux-gnu/libc.so.6(realloc+0x300)[0x7f6304403cf0]
/home/welinton/Qt/5.2.1/gcc_64/lib/libQt5Core.so.5(_ZN9QListData7reallocEi+0x26)[0x7f6304d52016]
/home/welinton/Qt/5.2.1/gcc_64/lib/libQt5Core.so.5(_ZN9QListData6appendEi+0x65)[0x7f6304d520d5]

...

The program has unexpectedly finished.
/home/welinton/Documents/Projetos/QtProjetos/build-TesteQT-Desktop_Qt_5_2_1_GCC_64bit-Debug/TesteQT crashed

[me.javiergmail.com]

Hi,

I'm ecountered the same problem!

Anybody knows a solution?

Thnx.

[me.javiergmail.com]

hi again,

I solve the problem!

1. complete remove opencv and qt
2. Install opncv and qt following "this":https://code.google.com/p/qt-opencv-multithreaded/wiki/Documentation instrucions
3. in your .PRO file put simply
   LIBS += pkg-config --libs opencv

That's all folks!

[Welinton]

[quote author="me.javier@gmail.com" date="1403091317"]hi again,

I solve the problem!

1. complete remove opencv and qt
2. Install opncv and qt following "this":https://code.google.com/p/qt-opencv-multithreaded/wiki/Documentation instrucions
3. in your .PRO file put simply
   LIBS += pkg-config --libs opencv

That's all folks![/quote]

Thanks for the reply. I was using netbeans to work with qt and opencv. You helped a lot.

[SGaist]

Hi,

For 3)

@
CONFIG += link_pkgconfig
PKGCONFIG += opencv
@