#include <iostream>
#include <opencv2/highgui.hpp>
using namespace cv;
using namespace std;

// Driver code
int main(int argc, char** argv)
{
    //----- COMMAND LINE -----
    const String& filename = argv[1];
    Mat image = imread(argv[1]);

    //----- EXPLICIT WAY -----
    //const String& filename = "C:/Users/letto/OneDrive/Things/sonoio.jpg";
    //Mat image = imread(filename);


    // Error Handling
    if (image.empty()) {
        cout << "Image File "
            << "Not Found" << endl;

        // wait for any key press
        cin.get();
        return -1;
    }

    // Show Image inside a window with
    // the name provided
    imshow("Window Name", image);

    // Wait for any keystroke
    waitKey(0);
    return 0;
}

With the code above I'm trying to open an image.

There are two ways I'm trying to do it:

1. COMMAND LINE: I pass the image url as a command;
2. EXPLICIT WAY: I write explicitly the image url.

The second method works perfectly. With the first method I get this exception:

Exception thrown at 0x00007FFAC1FFF551 (ucrtbased.dll) in OpenImg.exe: 0xC0000005: Access violation reading location 0x0000000000000000.

I'm using Visual Studio Code 2022 so this is the way I'm passing the url through the command line:

Where is the error? Help me find out please, thanks!

CodePudding user response：

You have set - according to the image attached - additional command line arguments to the compiler and not to the app you run.

To add command lines to the app, right click on the project (OpenImg) and choose Debugging -> Command Arguments.

(And, as mentioned by @user4581301, verifying that the argument exists by checking args would've showed that accessing argv[1] would've been out of bounds. Its a good habit to learn.)