Here's an example of how I use it:

#define PointSizeToPixel(Point, DPI) (-MulDiv( Point, DPI, 72 ) )

        LOGFONT lf;

        // lf get's initialised with the last settings

        CFontDialog dlg;

        dlg.m_cf.lpLogFont = &lf;
        dlg.m_cf.nSizeMin = 4;
        dlg.m_cf.nSizeMax = 16;
        dlg.m_cf.Flags |= CF_PRINTERFONTS | CF_FORCEFONTEXIST |
                        CF_LIMITSIZE | CF_INITTOLOGFONTSTRUCT;

        {
                /* Convert the point size to pixels */
                /***** The LOGFONT height used here uses the screen
DPI rather than the printers ****/
                HDC hDispDC = ::GetDC( m_hWnd );

                lf.lfHeight = PointSizeToPixel( lf.lfHeight,
                        GetDeviceCaps( hDispDC, LOGPIXELSY ) ) / 10;

                ::ReleaseDC( m_hWnd, hDispDC );
        }

        if ( dlg.DoModal() == IDOK )
        {
                /* Save the lfHeight in tenths of a point rather than
in pixels specific to a device */
                lf.lfHeight = dlg.m_cf.iPointSize;
        }

Dave
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Thanks for the example code.  They helped solve my problem.  I had used
brute-force calculation for the point-to-pixel transformation, which always
rounded DOWN to an integer.  MulDiv offered the possibility of rounding up
and solved the problem.

Thanks again for your help.

Richard L. Chen