C++/File/Array Based IO

A dynamic output array

<source lang="cpp">

1. include <strstream>
2. include <iostream>

using namespace std; int main() {

 char *p;
 ostrstream outs;                       // dynamically allocate array
 outs << "C++ array-based I/O ";
 outs << -10 << hex << " ";
 outs.setf(ios::showbase);
 outs << 100 << ends;
 p = outs.str();                        // Freeze dynamic buffer and return
                                        // pointer to it.
 cout << p;
 return 0;

}

      </source>

An array-based output stream

<source lang="cpp">

1. include <strstream>
2. include <iostream>

using namespace std; int main() {

 char str[80];
 ostrstream outs(str, sizeof(str));
 outs << "array-based I/O. ";
 outs << 1024 << hex << " ";
 outs.setf(ios::showbase);
 outs << 100 << " " << 99.789 << ends;
 cout << str;  
 return 0;

}

      </source>

Using Binary I/O with Array-Based Streams

<source lang="cpp">

1. include <iostream>
2. include <strstream>

using namespace std; int main() {

 char *p = "this is a test\1\2\3\4\5\6\7";
 istrstream ins(p);
 char ch;
 while (!ins.eof()) {                       // read and display binary info
   ins.get(ch);
   cout << hex << (int) ch << " ";
}
 return 0;

}

      </source>