Need help regarding saving variables via fstream, do I need to use vector?

Question

I doing this project, where I want to save some variables for a device; Devicename, ID and type.

bool Enhedsliste::newDevice(string deviceName, string type)
{
fs         


        

Answer 1

To delete a single device you might read the file and write to a temporary file. After transferring/filtering the data, rename and delete files:

#include 
#include 
#include 

int main() {
    std::string remove_device = "Remove";
    std::ifstream in("Devices.txt");
    if( ! in) std::cerr << "Missing File\n";
    else {
        std::ofstream out("Devices.tmp");
        if( ! out) std::cerr << "Unable to create file\n";
        else {
            std::string device;
            std::string id;
            std::string type;
            while(out && std::getline(in, device) && std::getline(in, id) && std::getline(in, type)) {
                if(device != remove_device) {
                    out << device << '\n' << id << '\n' << type << '\n';
                }
            }
            if( ! in.eof() || ! out) std::cerr << "Update failure\n";
            else {
                in.close();
                out.close();
                if( ! (std::rename("Devices.txt", "Devices.old") == 0
                && std::rename("Devices.tmp", "Devices.txt") == 0
                && std::remove("Devices.old") == 0))
                    std::cerr << "Unable to rename/remove file`\n";
            }
        }
    }
}