DIPROPHEADER

Serves as a header for all property structures.

typedef struct DIPROPHEADER {
    DWORD dwSize;
    DWORD dwHeaderSize;
    DWORD dwObj;
    DWORD dwHow;
} DIPROPHEADER, *LPDIPROPHEADER;

Members

dwSize

Size of the enclosing structure. This member must be initialized before the structure is used.

dwHeaderSize

Size of the DIPROPHEADER structure.

dwObj

Object for which the property is to be accessed. The value set for this member depends on the value specified in the dwHow member.

dwHow

Value that specifies how the dwObj member should be interpreted. This value can be one of the following:

DIPH_DEVICE

The dwObj member must be 0.

DIPH_BYOFFSET

The dwObj member is the offset into the current data format of the object whose property is being accessed.

DIPH_BYUSAGE

The dwObj member is the human interface device usage page and usage values in packed form.

DIPH_BYID

The dwObj member is the object type/instance identifier. This identifier is returned in the dwType member of the DIDEVICEOBJECTINSTANCE structure returned from a previous call to the IDirectInputDevice8::EnumObjects member.