Plotting a pixel with DDraw

I'm a very beginning DirectDraw programmer
I want to know how to plot a pixel with
DirectDraw, and maybe some example source code
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1:Lock the surface
2:Do pixel
3:UnLock the surface


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// Lock the primary surface
    if FAILED( lpDDSPrimary->Lock( NULL, &ddsd, DDLOCK_WAIT , NULL ) )
        return Fail( hwnd, "Couldn't lock the primary surface.\n" );

    // Clear it to white
    // We are assuming: 1) we are palettized, so each
    // pixel is represented by a "byte" and 2) since we are not setting
    // a new palette, entry 255 should be white.
    dest = (BYTE *)ddsd.lpSurface;
    for ( y = 0; y < ( int )ddsd.dwHeight; y++ )
        for ( x = 0; x < (( int )ddsd.dwWidth ); x++ )
            dest[x] = 0xFF;
        // lPitch contains the pitch in *bytes*
        dest += ddsd.lPitch;

    // Unlock the primary surface
    if FAILED( lpDDSPrimary->Unlock( NULL ) )
        return Fail( hwnd, "Couldn't unlock the primary surface.\n" );

This is the way to white a 256-color surface.But if you in 16bit,you need first get the formate,I mean 5-6-5 or other combination ,then You can do the same.

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