Provides an application with a single entry point for all incoming calls.
| DWORD dwCallType,
||//Type of incoming call
| HTASK threadIDCaller,
||//Task handle calling this task
| DWORD dwTickCount,
||//Elapsed tick count
| LPINTERFACEINFO lpInterfaceInfo
||//Points to INTERFACEINFO structure
[in] Indicates the kind of incoming call that has been received; valid values
are from the enumeration CALLTYPE
. See the chapter on enumerations for details.
[in] Specifies the handle of the task is calling this task.
[in] Specifies the elapsed tick count since the outgoing call was made if dwCallType
is not CALLTYPE_TOPLEVEL. If dwCallType
is CALLTYPE_TOPLEVEL, dwTickCount
should be ignored.
Points to an INTERFACEINFO
structure that contains information about the incoming call. Can also be
The application may be able to process the call.
The application cannot handle the call due to an unforeseen problem, such as
The application cannot handle the call at this time. For example, an
application might return this value when it is in a user-controlled modal state.
If implemented, IMessageFilter::HandleInComingCall
is called when an incoming OLE message is received.
Depending on the application's current state, the call can either be accepted
and processed or rejected (permanently or temporarily). If SERVERCALL_ISHANDLED
is returned, the application may be able to process the call. Success may
depend on the interface for which the call is destined. If the call cannot be
processed, OLE returns RPC_E_CALL_REJECTED.
Input-synchronized and asynchronous calls are dispatched even if the
application returns SERVERCALL_REJECTED or SERVERCALL_RETRYLATER.
should not be used to hold off updates to objects during operations such as
band printing. For that purpose, use IViewObject::Freeze
You can also use IMessageFilter::HandleInComingCall
to set up the application's state so the call can be processed in the future.
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