CODEWITHSUNDEEP
c++logging
manatttta
manatttta

Reputation: 3130

C++ How to save file stream in memory to another location

I have regular text log file in memory, 

ofstream logfile;

It is encapsulated in a Logger class, with a destructor closing that file,

class Logger {
    ofstream logfile;
    ~Logger() {
        logfile.close();
    }
    ...
}

What I want to do is, at the Logger destructor, save another copy of log file to another directory.

What is the best way to do this?

Upvotes: 0

Views: 738

Answers (2)

Brandon
Brandon

Reputation: 23495

#include <iostream>
#include <fstream>

class Logger
{
    private:
        std::fstream logfile; //fstream allows both read and write open-mode.
        std::fstream secondfile;
        const char* second;

    public:
        Logger(const char* file, const char* second)
        : logfile(), secondfile(), second(second)
        {
            //open for both read and write, the original logfile.
            logfile.open(file, std::ios::in | std::ios::out | std::ios::trunc);
        }

        void Write(const char* str, size_t size)
        {
            logfile.write(str, size); //write to the current logfile.
        }

        ~Logger()
        {
            logfile.seekg(0, std::ios::beg);
            secondfile.open(second, std::ios::out); //open the second file for write only.
            secondfile<<logfile.rdbuf(); //copy the original to the second directly..

            //close both.
            logfile.close();
            secondfile.close();
        }
};

int main()
{
    Logger l("C:/Users/Tea/Desktop/Foo.txt", "C:/Users/Tea/Desktop/Bar.txt");
    l.Write("HELLO", 5);
}

Upvotes: 1

Quest
Quest

Reputation: 2843

Maybe this is not the best approach, but it's a working one.
You can create a new instance of std::ofstream and copy all of your data into it.

Upvotes: 1

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