video capturing works in the example code, but doesn't in my own project

Question

I built opencv with openni2 using Cmake, and I succeeded to run the example 'openni_capture' which is in OpenCV.sln. It clearly shows the video being captured. I'm using Orbbec Astra camera.

But when I try to make my own project, copy and paste the code, and run it, it says 'can not open a capture object' even if it was successfully built.

The code is like below. The problem is that 'capture.isOpened()' is TRUE in the example project, but it is FALSE in my own project which has exactly same code as the example project.

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"

#include <iostream>

using namespace cv;
using namespace std;

static void colorizeDisparity( const Mat& gray, Mat& rgb, double maxDisp=-1.f, float S=1.f, float V=1.f )
{
.
.
.
}

static float getMaxDisparity( VideoCapture& capture )
{
.
.
.
}

    static void printCommandLineParams()
{
    cout << "-cd=       Colorized disparity? (0 or 1; 1 by default) Ignored if disparity map is not selected to show." << endl;
    cout << "-fmd=      Fixed max disparity? (0 or 1; 0 by default) Ignored if disparity map is not colorized (-cd 0)." << endl;
    cout << "-mode=     image mode: resolution and fps, supported three values:  0 - CAP_OPENNI_VGA_30HZ, 1 - CAP_OPENNI_SXGA_15HZ," << endl;
    cout << "          2 - CAP_OPENNI_SXGA_30HZ (0 by default). Ignored if rgb image or gray image are not selected to show." << endl;
    cout << "-m=        Mask to set which output images are need. It is a string of size 5. Each element of this is '0' or '1' and" << endl;
    cout << "          determine: is depth map, disparity map, valid pixels mask, rgb image, gray image need or not (correspondently), ir image" << endl ;
    cout << "          By default -m=010100 i.e. disparity map and rgb image will be shown." << endl ;
    cout << "-r=        Filename of .oni video file. The data will grabbed from it." << endl ;
}

static void parseCommandLine( int argc, char* argv[], bool& isColorizeDisp, bool& isFixedMaxDisp, int& imageMode, bool retrievedImageFlags[],
                       string& filename, bool& isFileReading )
{
    filename.clear();
    cv::CommandLineParser parser(argc, argv, "{h help||}{cd|0|}{fmd|0|}{mode|-1|}{m|000100|}{r||}");
    if (parser.has("h"))
    {
        help();
        printCommandLineParams();
        exit(0);
    }
    isColorizeDisp = (parser.get<int>("cd") != 0);
    isFixedMaxDisp = (parser.get<int>("fmd") != 0);
    imageMode = parser.get<int>("mode");
    int flags = parser.get<int>("m");
    isFileReading = parser.has("r");
    if (isFileReading)
        filename = parser.get<string>("r");
    if (!parser.check())
    {
        parser.printErrors();
        help();
        exit(-1);
    }
    if (flags % 1000000 == 0)
    {
        cout << "No one output image is selected." << endl;
        exit(0);
    }
    for (int i = 0; i < 6; i++)
    {
        retrievedImageFlags[5 - i] = (flags % 10 != 0);
        flags /= 10;
    }
}

int main( int argc, char* argv[] )
{
    bool isColorizeDisp, isFixedMaxDisp;
    int imageMode;
    bool retrievedImageFlags[6];
    string filename;
    bool isVideoReading;
    parseCommandLine( argc, argv, isColorizeDisp, isFixedMaxDisp, imageMode, retrievedImageFlags, filename, isVideoReading );

    cout << "Device opening ..." << endl;
    VideoCapture capture;
    if( isVideoReading )
        capture.open( filename );
    else
    {
        capture.open( CAP_OPENNI2 );
        if (!capture.isOpened())
        {
            capture.open(CAP_OPENNI);
        }
    }

    cout << "done." << endl;

    if( !capture.isOpened() )
    {
        cout << "Can not open a capture object." << endl;
        return -1;
    }
.
.
.

I added to VC++ directory-include directory that

C:\OpenCV_end\Source\opencv-3.4.0\build\install\include ,C:\Program Files\OpenNI2\Include

I added to VC++ directory-library directory that

C:\OpenCV_end\Source\opencv-3.4.0\build\install\x64\vc14\lib ,C:\Program Files\OpenNI2\Lib

I added to Linker-input that

opencv_world340d.lib ,OpenNI2.lib

and I copied the dll files to the folder which contains my project source. opencv_world340d.dll and all the files which are in C:\Program Files\OpenNI2\Redist

but it never wants to work.. Please help me

Thank you.