Enumerates all the display modes that the hardware exposes through the DirectDraw object and that are compatible with a provided surface description.
HRESULT EnumDisplayModes( DWORD , LPDDSURFACEDESC2 , LPVOID , LPDDENUMMODESCALLBACK2 );
This value consists of one or more of the following flags:
Enumerates modes with different refresh rates. IDirectDraw7::EnumDisplayModes guarantees that a particular mode is enumerated only once. This flag specifies whether the refresh rate is taken into account when determining whether a mode is unique.
Enumerates Mode 13 in addition to the 320x200x8 Mode X mode.
Address of a DDSURFACEDESC2 structure to be checked against available modes. If the value of this parameter is NULL, all modes are enumerated.
Address of an application-defined structure to be passed to each enumeration member.
Address of the EnumModesCallback2 function that the enumeration procedure calls every time a match is found.
If the method succeeds, the return value is DD_OK.
If it fails, the method can return one of the following error values:
IDirectDraw7::EnumDisplayModes enumerates the dwRefreshRate member of the DDSURFACEDESC2 structure; the IDirectDraw::EnumDisplayModes method does not have this ability. If you use the IDirectDraw7::SetDisplayMode method to set the refresh rate of a new mode, use IDirectDraw7::EnumDisplayModes to enumerate the dwRefreshRate member.
IDirectDraw7::EnumDisplayModes differs from its counterparts in former interfaces in that it accepts the address of an EnumModesCallback2 function as a parameter, rather than an EnumModesCallback function.