Line Drawing

I want to draw vertical and horizontal straight lines in WM_PAINT, How can I do it useing CDC?

CDC is for MFC if I am not wrong, and WM_PAINT is for programs that don't use MFC, if I am not wrong.

Here is a solution, not for MFC:

Code:

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int paint_line(HWND hwnd, HDC hdc, int x0, int y0, int x9, int y9, int thickness, COLORREF rgb)
{
  HBRUSH hbr; HPEN hpen, hpen_sav;

  // int rop2_sav;
  // rop2_sav = SetROP2(hdc, R2_NOTXORPEN);

  hpen = CreatePen(PS_SOLID, thickness, rgb);
  hpen_sav = (HPEN) SelectObject(hdc, hpen);
  hbr = (HBRUSH)SelectObject(hdc, GetStockObject(NULL_BRUSH));

  MoveToEx(hdc, x0, y0, NULL);
  LineTo(hdc, x9, y9);
  DeleteObject(SelectObject(hdc, hbr));
  SelectObject(hdc, hpen_sav);
  DeleteObject(hpen);

  return 0;
}

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Sorry I ean OnDraw. The way you can draw Rectangle and Ellipse, I want to draw lines

MoveTo(x,y) moves the pen to position and LineTo(x,y) draws the line from MoveTo position to LineTo position

this code draws grey lines,horizontal and vertical in center of screen

Code:

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OnDraw()
{
      CRect rect;
        GetClientRect(rect);
        CPen penGrey;  // Construct it, then initialize
                if( penGrey.CreatePen( PS_SOLID, 0, RGB(200,200,200) ) )
                {
                        // Select it into the device context
                        // Save the old pen at the same time
                        CPen* pOldPen = pDC->SelectObject( &penGrey );

                        // Draw with the pen
                        //draws axis
                        pDC->MoveTo(rect.right/2,rect.top);
                        pDC->LineTo(rect.right/2,rect.bottom);
                        pDC->MoveTo(rect.right,rect.bottom/2);       
                        pDC->LineTo(rect.left,rect.bottom/2);

                        // Restore the old pen to the device context
                        pDC->SelectObject( pOldPen );
                }
                else
                {
                        MessageBox("Resources are running low\nPlease close one or more                    applications");               
                }
}

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MSDN knows everything about the CDC object.