Abnormal termination when calling `cvCreateCameraCapture(-1)` - c++

Question

My code as follow. When I execute cvCreateCameraCapture(-1) in openCamera, the app ends.
TIP: Abnormal program termination. during startup program exited with code 0X000135
Why? The computer is notebook, and inner-Camera.
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
>
#include<highgui.h>
#include<cv.h>
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void openCamera();
void readFrame();
void closeCamera();
void takingPhote();
private:
Ui::MainWindow *ui;
QTimer* timer;
QImage* image;
CvCapture* cam;
IplImage* frame;
};
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
cam = NULL;
timer = new QTimer(this);
image = new QImage;
connect(ui->openCamera, SIGNAL(clicked()), this, SLOT(openCamera()));
}
void MainWindow::openCamera()
{
cam = cvCreateCameraCapture(-1);
// timer->start(33);
// connect(timer, SIGNAL(timeout()), this, SLOT(readFrame()));
}

Answer 1

Adding my previous comment as an answer since it helped you solve the problem:
I want you to replace the cvCreateCameraCapture() call for something else, like cvWaitKey(0);. If this is a runtime issue related to environment variables and Windows not finding OpenCV, this simple test will show. So, if it continues to crash then it might really be related to the environment configuration.