File output strange problem

I have written a class that does basic compression and decompression on audio .raw files..
It works fine when its a stand-alone class. Recently I am trying to merge the class to my VC++.net managed Form.
It does not give the correct outfile anymore..
anyway this is the code that does encoding:
void smartACD::encode(string filename, string outfilename, int k)
{
  unsigned char first, second;
  short int c, c_new, qs, d;
  unsigned short int towrite;
  int oremain, iremain;
  unsigned char toput = 0x00;
  ifstream infile(filename.c_str());
  ofstream outfile(outfilename.c_str());
...
...
... a bit too long so i will skip the boring part
...

while(infile.good()){
    first = infile.get();
    second = infile.get();
    c_new = second;
    c_new <<= 8;
    c_new |= first;

    d = c_new - c;
    c_new = 0;
    if(d >= qs)
      d = qs - 1;
    else if(d <= (-qs))
      d = 1 - qs;
 
    c = c + d;
    towrite = d + qs - 1;
    ihave = k;
    while(ihave > 0){
      tmp = towrite << (16-ihave);
      tmp >>= (16-ihave);
      if(ihave > ineed){
      toput |= tmp >> (ihave - ineed);
      outfile.put(toput);
      i = 0;
      toput = 0;
      ihave -= ineed;
      ineed = 8;
      }
      else{
      toput |= tmp << (ineed - ihave);
      ineed -= ihave;
      ihave = 0;
      i = 1;
      }
    }
  }
  if(i)
    outfile.put(toput);
  outfile.close();
  infile.close();  
}
=========================================================================
This would work perfect fine if i just make a driver for it and call it in unix shell..
Here is how I create it in my windows Form:

    public __gc class Form1 : public System::Windows::Forms::Form
    {  
    public:
        smartACD * myACD;
        Form1(void)
        {
            InitializeComponent();
            myACD = new smartACD();
        }
...
...Skipping useless part
...

//Here is where I call it:
private: System::Void menuItem2_Click(System::Object *  sender, System::EventArgs *  e)
             {
                   StartThread2();
                   myACD->encode("music.raw", "music_en.raw", 3);
             }

I use breakpoint and does step into, step over, and found out that it runs the encode function, but the output file is just not of the correct size for some reason. In fact, it always generated some 1kb file no matter how big the raw file i put in.
I am guessing there is something incompatible with the vc++ fstream , OR, there is some environment setting which i didn't turn on .

Please give me a hand on this one ! thanks
500 points for the length of this post