IoWMIWriteEvent function (wdm.h)
The IoWMIWriteEvent routine delivers a given event to the user-mode WMI components for notification.
Syntax
NTSTATUS IoWMIWriteEvent(
[in, out] PVOID WnodeEventItem
);
Parameters
[in, out] WnodeEventItem
Pointer to a WNODE_EVENT_ITEM structure to be delivered to the user-mode WMI components that requested notification of the event.
Return value
IoWMIWriteEvent returns a status code from the following list:
| Return code | Description |
|---|---|
|
Indicates that WMI has successfully queued the event for delivery to the user-mode WMI components. |
|
Indicates that WMI services are unavailable. |
|
Indicates that the event item specified exceeds the maximum allowed size. |
|
Indicates that insufficient resources were available for WMI to queue the event for delivery. |
Remarks
The WNODE_EVENT_ITEM structure that is allocated by the caller and passed in WnodeEventItem must be allocated from nonpaged pool. If IoWMIWriteEvent returns STATUS_SUCCESS, the memory for the event item will automatically be freed by the system. If IoWMIWriteEvent returns anything other than STATUS_SUCCESS, it is the caller's responsibility to free the buffer.
Drivers should only call IoWMIWriteEvent for events that have been enabled for WMI. This ensures that there is an event consumer waiting for indication on that event.
Callers of this routine must be running at IRQL <= APC_LEVEL, with one exception. When the Flags member of the WNODE_HEADER structure contains WNODE_FLAG_TRACED_GUID, IoWMIWriteEvent can be called at any IRQL. (The WNODE_HEADER structure is a member of the WNODE_EVENT_ITEM structure that the WnodeEventItem parameter points to.)
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available starting with Windows 2000. |
| Target Platform | Universal |
| Header | wdm.h (include Wdm.h, Ntddk.h, Ntifs.h) |
| Library | NtosKrnl.lib |
| DLL | NtosKrnl.exe |
| IRQL | <= APC_LEVEL (see Remarks section) |