IActionOnCLREvent::OnEvent Method

Performs callbacks on events that have been registered by using a call to the ICLROnEventManager::RegisterActionOnEvent Method method.

HRESULT OnEvent (
    [in] EClrEvent event,
    [in] PVOID     data
);

Parameters

• event
  [in] One of the EClrEvent Enumeration values, which indicates the type of event.

• data
  [in] A pointer to an object that contains details about event.

Return Value

HRESULT	Description
S_OK	OnEvent returned successfully.
HOST_E_CLRNOTAVAILABLE	The common language runtime (CLR) has not been loaded into a process, or the CLR is in a state in which it cannot run managed code or process the call successfully.
HOST_E_TIMEOUT	The call timed out.
HOST_E_NOT_OWNER	The caller does not own the lock.
HOST_E_ABANDONED	An event was cancelled while a blocked thread or fiber was waiting on it.
E_FAIL	An unknown catastrophic failure occurred. If a method returns E_FAIL, the CLR is no longer usable within the process. Subsequent calls to any hosting method return HOST_E_CLRNOTAVAILABLE.

Remarks

The data parameter is a pointer to an object of unspecified type. If the event parameter is Event_DomainUnload, data is the numeric identifier for the AppDomain that was unloaded. The host can take appropriate action using this identifier as a key.

If event is Event_MDAFired, data is a pointer to an MDAInfo Structure instance that contains the message output from a Managed Debugging Assistant (MDA). MDAs are a feature of the CLR that help developers with debugging, by generating XML messages about events that are otherwise difficult to trap. Such messages can be especially useful in debugging transitions between managed and unmanaged code. For more information, see Diagnosing Errors with Managed Debugging Assistants.

Requirements

Platforms: Windows 2000, Windows XP, Windows Server 2003 family

Header: MSCorEE.idl

Library: Included as a resource in MSCorEE.dll

.NET Framework Version: 2.0

See Also

Reference

EClrEvent Enumeration
IActionOnCLREvent Interface
ICLRControl Interface
ICLROnEventManager Interface
MDAInfo Structure

Concepts

Diagnosing Errors with Managed Debugging Assistants