token = strtok(buffer,","); // Se te olvidó strtok!!

#include <windows.h>
#include <iostream>
 
int main() {
    const int bufferSize = MAX_PATH;
    char oldDir[bufferSize]; // store the current directory
 
    // get the current directory, and store it
    if (!GetCurrentDirectory(bufferSize, oldDir)) {
        std::cerr << "Error getting current directory: #" << GetLastError();
        return 1; // quit if it failed
    }
    std::cout << "Current directory: " << oldDir << '\n';
 
    // new directory
    const char* newDir = R"(C:\path\to\directory\)"
    if (!SetCurrentDirectory(newDir)) {
        std::cerr << "Error setting current directory: #" << GetLastError();
        return 1; // quit if we couldn't set the current directory
    }
    std::cout << "Set current directory to " << newDir << '\n';
 
    // Delete some files
    DeleteFile("file1.txt");
    DeleteFile("bin\\file2.exe");
    DeleteFile(R"(data\things\other\file3.zip)");
 
    // Reset the current directory back to what it was.
    if (!SetCurrentDirectory(oldDir)) {
        std::cerr << "Error resetting current directory: #" << GetLastError();
        return 1;
    }
    std::cout << "Reset current directory. \n";
 
    // ...
 
    return 0;
}

#include <iostream>
#include <string>
 
int main() {
	std::string cadena = "Hola";
 
	std::cout << "Direccion en main de objeto: " << &cadena << std::endl;
	std::cout << "Direccion en main de cadena: " << (void *)cadena.c_str() << std::endl;
 
	cadena.append(". Esto es una adjunción dentro de una función");
 
	std::cout << "Direccion despues de append: " << (void *)cadena.c_str() << std::endl;
 
	return 0;
}

Direccion en main de objeto: 0x23fe10
Direccion en main de cadena: 0x23fe20
Direccion despues de append: 0x8418f0

#include <iostream>
#include <string>
#include <memory>
 
int main() {
	unsigned int variable = 0;
	std::string cadena = "Hola";
	char *caracter = new char;
 
	std::cout << "Direccion de variable local: " << &variable << std::endl;
	std::cout << "Direccion de cadena: " << (void *)cadena.c_str() << std::endl;
	std::cout << "Direccion de un byte en el heap: " << (void *)caracter << std::endl;
 
	delete caracter;
	return 0;
}

Direccion de variable local: 0x23fe30
Direccion de cadena: 0x23fe20
Direccion de un byte en el heap: 0x4b18f0

#include <iostream>
#include <string>
#include <memory>
 
int main() {
	std::string cadena = "Hola";
	const char *cadena_c = (const char *)(addressof(cadena));
	unsigned int i = 0;
 
	std::cout << std::hex;
	for(i = 0; i < sizeof(cadena); i++)
		std::cout << (unsigned int)cadena_c[i] << " - " << cadena_c[i] << std::endl;
 
	return 0;
}

10 - ►
fffffffe - ■
23 - #
0 -
0 -
0 -
0 -
0 -
4 - ♦
0 -
0 -
0 -
0 -
0 -
0 -
0 -
48 - H
6f - o
6c - l
61 - a
0 -
ffffffff -  
ffffffff -  
ffffffff -  
fffffff5 - §
18 - ↑
40 - @
0 -
0 -
0 -
0 -
0 -

A bad_alloc exception is thrown if the function fails when attempting to allocate storage.

while(!feof(origen)){
	leido = fread(buffer,1,256,origen);
	if(0 < leido)
		fwrite(buffer,1,leido,destino);
}