I’m using libcurl to download a json file and then I want to get the hwids of the json by using nlohmann json and there is where the exception happens and I can’t figure it out on my own.

I’m pretty new to c++ so please don’t bomb me away thanks.

Screenshot of the Exception

My application gets detected as Virus, I think it’s because of fopen, would be nice if someone could fix this.
Also I would really appreciate, if you could optimize my code thanks!

My Utils.cpp

#include <fcntl.h>
#include <io.h>
#include <filesystem>

#include "HWID.h"

#define PathAppendW
#define CURL_STATICLIB
#define SHGetFolderPathW
#include "curl/curl.h";

namespace fs = std::filesystem;

static size_t write_data(void* ptr, size_t size, size_t nmemb, void* stream)
{
    size_t written = fwrite(ptr, size, nmemb, (FILE*)stream);
    return written;
}

void savefile(std::string path) {

    char c[MAX_PATH];

    strcpy(c, path.c_str());

    CURL* curl_handle;
    static const char* pagefilename = c;

    curl_global_init(CURL_GLOBAL_ALL);

    /* init the curl session */
    curl_handle = curl_easy_init();

    /* set URL to get here */
    curl_easy_setopt(curl_handle, CURLOPT_URL, "http://anix.bplaced.net/hwids.json");

    /* Switch on full protocol/debug output while testing */
    curl_easy_setopt(curl_handle, CURLOPT_VERBOSE, 1L);

    /* disable progress meter, set to 0L to enable it */
    curl_easy_setopt(curl_handle, CURLOPT_NOPROGRESS, 1L);

    /* send all data to this function  */
    curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, write_data);

    /* open the file */
    FILE* pagefile = fopen(pagefilename, "w");
    if (pagefile) {

        /* write the page body to this file handle */
        curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, pagefile);

        /* get it! */
        curl_easy_perform(curl_handle);

        /* close the header file */
    }

    /* cleanup curl stuff */
    curl_easy_cleanup(curl_handle);

    curl_global_cleanup();
}

int main()
{
    std::string appdata = getenv("APPDATA");
    const std::string dir = appdata + "AnixCSGO";
    fs::create_directories(dir);

    std::string file = dir + "hwids.json";

    savefile(file);

    HWID hwid;
    if (hwid.isinList(file)) hwid.printHWID();

}

My HWID.cpp

#include "HWID.h"

void HWID::hwidList(std::string file) {

    std::ifstream reader(file);
    json j;
    reader >> j;
    reader.close();
    

    for (int i = 0; i < j["csgo"].size(); i++) {
        hwids.push_back(j.at("csgo")[i].at("HWID"));
    }
}

void HWID::getHWID() {
    TCHAR volumeName[MAX_PATH + 1] = {}; // catch info of harddrive
    TCHAR systemName[MAX_PATH + 1] = { 0 };
    DWORD maxlen = 0; // max length of hwid
    DWORD systemflags = 0; // user infos
    if (GetVolumeInformation(_T("C:"), volumeName, ARRAYSIZE(volumeName), &hwidnum, &maxlen, &systemflags, systemName, ARRAYSIZE(systemName)));
}

boolean HWID::isinList(std::string file) {
    hwidList(file);

    getHWID();

    if (find(hwids.begin(), hwids.end(), std::to_string(hwidnum)) != hwids.end()) { // check if hwid is on the list
        return true;
    }
    return false;
}

void HWID::printHWID() {
    getHWID();
    std::cout << "Your HWID: " << hwidnum << "n";
}

Source: Windows Questions C++