STGConstants
S_OK = 0
STG_E_INVALIDFUNCTION = -2147287039
STG_E_READFAULT = -2147287010
STG_E_WRITEFAULT = -2147287011
STGM_DELETEONRELEASE = 67108864
STGM_READ = 0
STGM_READWRITE = 2
STGM_SHARE_DENY_NONE = 64
STGM_WRITE = 1
STGY_LOCKBYTES = 3