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copied!<p>There are several platform-independent ways to do it. In C++ you can use <code>stringstream(http://www.cplusplus.com/reference/sstream/stringstream/)</code>, which has many <code><<</code> operator overloads. So if you pass a reference to <code>ostream&</code> (not <code>oFstream</code>) to the output method, you can easily switch between files, stadard output stream and string outputs, because all this streams are inherited from ostream. Then you can get <code>std::string</code> object from <code>stringstream</code> and get C-string from it if you need.</p> <p>Code example:</p> <p>Output function (or method, then you don't need the second argument from the example):</p> <pre class="lang-cpp prettyprint-override"><code>void PrintMyObjectToSomeStream(std::ostream& stream, const MyClass& obj) { stream << obj.pubField1; stream << obj.pubField2; stream << obj.GetPrivField1(); stream << "string literal"; stream << obj.GetPrivField2(); } </code></pre> <p>Usage:</p> <pre class="lang-cpp prettyprint-override"><code>MyClass obj1; std::ofsstream ofs; std::stringstream sstr; //...open file for ofs, check if it is opened and so on... //...use obj1, fill it's member fields with actual information... PrintMyObjectToSomeStream(obj1,std::cout);//print to console PrintMyObjectToSomeStream(obj1,sstr);//print to stringstream PrintMyObjectToSomeStream(obj1,ofs);//print to file std::string str1=sstr.str();//get std::string from stringstream char* sptr1=sstr.str().c_str();//get pointer to C-string from stringstream </code></pre> <p>Or you can overload <code>operator<<</code>:</p> <pre class="lang-cpp prettyprint-override"><code>std::ostream& operator<<(std::ostream& stream, const MyClass& obj) { stream << obj1.pubField; //...and so on return stream; } </code></pre> <p>then you can use it in this way:</p> <pre class="lang-cpp prettyprint-override"><code>MyClass obj2; int foo=100500; std::stringstream sstr2; std::ofstream ofs;//don't forget to open it //print to stringstream sstr2 << obj2 << foo << "string lineral followed by int\n"; //here you can get std::string or char* as like as in previous example //print to file in the same way ofs << obj2 << foo << "string lineral followed by int\n"; </code></pre> <p>Using <code>FILE</code> is more C than C++ but you can think how to switch between <code>fpirntf</code> and <code>sprintf</code> or use Anton's answer.</p>

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