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how to enable back buffering in windowed mode?

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first I used SetCooperativeLevel to set the cooperate level to DDSCL_NORMAL so that the application runs in windowed mode; then I wrote
ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE | DDSCAPS_FLIP | DDSCAPS_COMPLEX;
ddsd.dwBackBufferCount = 2;

hres = g_pDD->CreateSurface( &ddsd, &g_pDDSPrimary, NULL );

and then I got hres set to DDERR_NOEXCLUSIVEMODE, which means it requires exclusive mode. but if I only use the primary surface, the function succeed. is there any way that I can enable back buffering while still using windowed mode?

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