C / C++ / MFC

Bitmap *pbm=::new Bitmap(rt.Width,rt.Height,bm.GetPixelFormat());
Graphics *pg=::new Graphics(pbm);
pg->SetInterpolationMode(InterpolationModeHighQuality);
pg->DrawImage(&bm,0,0,rt.Width,rt.Height);


//locked this way
pbm->LockBits(&Rect(0,0,rt.Width,rt.Height),ImageLockModeRead|ImageLockModeWrite,PixelFormat32bppARGB,&bmd);
...
//r,g,b can be changed normally. a can't. why?
pClr->SetValue(Color::MakeARGB(100,0xff,pClr->GetGreen(),pClr->GetBlue()));
//trace here, a is 100
a=pClr->GetAlpha();

//UnlockBits is also called

Matrix NM;
PointF fpt((float)pCB->m_Center.X,(float)pCB->m_Center.Y);
NM.RotateAt(pCB->m_Angle,fpt);
Matrix  OM;
m_pMemGraphics->GetTransform(&OM);
m_pMemGraphics->SetTransform(&NM);

ColorMatrix cm = {
    1.0f,0.0f,0.0f,0.0f,0.0f,
    0.0f,1.0f,0.0f,0.0f,0.0f,
    0.0f,0.0f,1.0f,0.0f,0.0f,
    0.0f,0.0f,0.0f,1.0f,0.0f,
    pCB->m_IntensityAdjust,pCB->m_IntensityAdjust,pCB->m_IntensityAdjust,0.f,1.0f
};
ImageAttributes ImAtt;
ImAtt.SetColorMatrix( &cm,ColorMatrixFlagsDefault,ColorAdjustTypeBitmap);
m_pMemGraphics->DrawImage(pbm,rt,0,0,rt.Width,rt.Height,UnitPixel,&ImAtt);

Bitmp bm("myimage.jpg");
Graphics gp(&bm);
//Can I stretch bm here?
//Can I use the bm which is stretched here?

class MyClass
{
public:
 int a;
 ostream &Print(ostream &str)
 {
  str << "a = " << a << "\n";
  return str;
 }
};
void main()
{
 MyClass obj;
 obj.a = 1;
 cout << "obj: " << obj.Print();
}