iostream

Hi, there,

I need to put a bunch of data to an iostream, or a buffer, sequencially for
each object, and write them to a file in specific sequence. Two issues:

1. I don't know the length of object.
2. The data are in variable size from one byte to four byte.

I need a simple way to store them, make some computation, and write to a
file finally. If iostream is not the best way, how to do it. Your time and
help are highly appreciated. Following is the structure stripped off
unnecessary parts:

class Base
{
int length;
virtual void Read();
virtual void Write();
};

class D1 : public Base
{
iostream* m_stream; // or streambuf, which one is better?
};

void D1::Read()
{
m_stream = new iostream();

streampos start = m_stream->tellp();
for (int i = 0; i < 10; i++) //write some data to the buffer
    m_stream->put(i);
streampos end = m_stream->tellp();

CheckWhatWeWrite(m_stream, start, end); //suppose we need to check
}

void D1::Write(ofstream* fOut)
{
//fOut->rdbuf(m_stream); ??? //I need to append this to fOut, which function
should use?
}

Thanks lot in advance!