C / C++ / MFC

void CWoopDoc::Serialize(CArchive& ar)
{
	if (ar.IsStoring())
	{
		//I need a bitmap object
      CBitmap BitMapTemp;
      //a device context to draw on it
      CDC CBitmapDC;  
      CBitmap* OldBitMap;
      
      //initialisation of the dc
      CBitmapDC.CreateCompatibleDC(NULL);
      
//here I'm not sure of that... I guess
      
      //I create an array of bytes for the bitmap
      void * bitmapbitstemp = malloc( Size_X*Size_Y / sizeof(BYTE));
      
      //here I create the bitmap
      BitMapTemp.CreateBitmap(Size_X,Size_Y,1,1,bitmapbitstemp);

		//I send my bitmap to the DC and save the old one
      OldBitMap = CBitmapDC.SelectObject(&BitMapTemp);
     
     //(... I draw in it)
     
      //now I wan't to save it
      
      //I need a bitmapInfoHeader and A bitMap File Header
      BITMAPFILEHEADER BmpFileH;
      BITMAPINFOHEADER bmpInfoH;
      BITMAP bm;
      BitMapTemp.GetBitmap(&bm);     //<--here I'm unable the get the bitmap bits, but the creation return true!!!
      BmpFileH.biBitCount = bm.bmBitsPixel;
      BmpFileH.biCompression = BI_RGB;
      BmpFileH.biHeight = bm.bmHeight;
      BmpFileH.biPlanes = bm.bmPlanes;
      BmpFileH.biWidth = bm.bmWidth;
      BmpFileH.biSizeImage = BI_RGB;
      BmpFileH.biClrUsed = 0;
      BmpFileH.biClrImportant = 2;
      BmpFileH.biXPelsPerMeter = 0;
      BmpFileH.biYPelsPerMeter = 0;
      BmpFileH.biSize = sizeof(BmpFileH);

      bmpInfoH.bfOffBits = sizeof(bmpInfoH)+sizeof(BmpFileH);
      bmpInfoH.bfSize = bm.bmWidthBytes;
      bmpInfoH.bfType = ('M' << 8 | 'B');
      bmpInfoH.bfReserved1 = 0;
      bmpInfoH.bfReserved2 = 0;
      
      ar.Write(&BmpFileH,sizeof(BmpFileH));
      ar.Write(&bmpInfoH,sizeof(bmpInfoH));
      //here I need to write the byte them self... but bm.bmBits are always NULL
      ar.Write(bm.bmBits,bm.bmWidthBytes);  
      
      //destroying...
      CBitmapDC.SelectObject(OldBitMap);

      delete bitmapbitstemp;
   }
	else
	{
		// TODO: add loading code here
	}
}