opencv program crashes only when debugger is attached - c++

Question

#include <opencv2/core.hpp>
#include <opencv2/imgcodecs.hpp>
#include "opencv2/opencv.hpp"
#include <opencv2/highgui.hpp>
#include <iostream>
#include <Windows.h>
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <direct.h>
#pragma comment(lib, "vfw32.lib")
#pragma comment( lib, "comctl32.lib" )
using namespace cv;
using namespace std;
void PrintFullPath(char * partialPath)
{
char full[_MAX_PATH];
if (_fullpath(full, partialPath, _MAX_PATH) != NULL)
printf("Full path is: %s\n", full);
else
printf("Invalid path\n");
}
int main(int argc, char** argv)
{
PrintFullPath(".\\");
Mat edges;
VideoCapture cap;
try
{
cap.open(0); // open the default camera
}
catch (...)
{
cout << "error!!" << endl;
}
if (!cap.isOpened()) // check if we succeeded
return -1;
//Mat edges;
namedWindow("edges", 1);
for (;;)
{
Mat frame;
cap >> frame; // get a new frame from camera
edges = frame;
GaussianBlur(edges, edges, Size(7, 7), 1.5, 1.5);
//Canny(edges, edges, 0, 30, 3);
//Sleep(2000);
imshow("edges", edges);
if (waitKey(30) >= 0) break;
}
return 0;
}
the program crashes ONLY when the debugger is attached, when i press f5 it crashes in line "cap.open(0)", but when I press cntrol f5 it runs perfectly.
the error i get is:
Unhandled exception at 0x09068EFB in opencv_1.exe: 0xC0000005: Access violation executing location 0x09068EFB.
im using visual studio 2013, windows 8.0, opencv 3.0.
if i run the exe file in the command line the prorgam runs perfectly.