OpenCV haarcascades loading is NOT working at all - c++

Question

I'm using visual studio 2019 with OpenCV 4.4.0
every thing was great but when i want to start face detection the cascade classifiar doesn't load the haarcascade
you also have to know that i installed openCV in the c partition and this is a simple code
#include "cuda_runtime.h"
#include "device_launch_parameters.h"
#include <opencv2\opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <Windows.h>
#include <vector>
#include <stdio.h>
using namespace std;
using namespace cv;
int main()
{
VideoCapture cam(0);
Mat img;
CascadeClassifier detector;
vector<Rect> faces;
Point p[2];
bool cap = false;
if (!detector.load("c:\\opencv\\sources\\data\\haarcascades\\haarcascade_frontalface_default.xml"))
{
cout << "Image Detector Doesn't work\n";
return EXIT_FAILURE;
}
if (!cam.isOpened())
{
cout << "Can't Open Camera\n";
return EXIT_FAILURE;
}
while (!cap)
{
cam.read(img);
imshow("Cam", img);
waitKey(0);
if (GetAsyncKeyState(VK_ESCAPE))
cap = true;
}
destroyWindow("Cam");
cout << "Detecting Face...\n";
detector.detectMultiScale(img, faces);
for (int i = 0; i < faces.size(); i++)
{
p[0] = Point(faces[i].x,faces[i].y);
p[1] = Point(faces[i].x + faces[i].height,faces[i].y + faces[i].width);
rectangle(img,p[0],p[1],Scalar(0,0,255),3);
}
imwrite("Result.jpg",img);
return EXIT_SUCCESS;
}
this code doesn't load the haarcascade and it returns "can't load" in the cmd
so i really need help with and thanks for all

Answer 1

\ is used as escape sequence in C++ string literals.
Therefore, you should use \\ to put a character \ in them.
if (!dec.load("c:\\opencv\\sources\\data\\haarcascades\\haarcascade_frontalface_default.xml"))