ContextFlags (ULONG)

Flags which control the contents of the context record.

Possible values are shown in the following list:

CONTEXT_CONTROL (0x00000001)

SS:ESP, CS:EIP, EFLAGS and EBP
CONTEXT_INTEGER (0x00000002)
EAX, EBX, ECX, EDX, ESI and EDI
CONTEXT_SEGMENTS (0x00000004)
DS, ES, FS, and GS
CONTEXT_FLOATING_POINT (0x00000008)
numeric coprocessor state
CONTEXT_FULL
CONTEXT_CONTROL | CONTEXT_INTEGER | CONTEXT_SEGMENTS | CONTEXT_FLOATING_POINT
If the context record is used as an input parameter, then for each portion of the context record controlled by a flag whose value is set, it is assumed that the portion of the context record contains valid context. If the context record is being used to modify a thread's context, then only that portion of the thread's context will be modified.

If the context record is used as an input/output parameter to capture the context of a thread, then only those portions of the thread's context corresponding to set flags will be returned.