IMessageFilter::RetryRejectedCall method (objidl.h)

Provides applications with an opportunity to display a dialog box offering retry, cancel, or task-switching options.

DWORD RetryRejectedCall(
  [in] HTASK htaskCallee,
  [in] DWORD dwTickCount,
  [in] DWORD dwRejectType
);

[in] htaskCallee

The thread id of the called application.

[in] dwTickCount

The number of elapsed ticks since the call was made.

[in] dwRejectType

Specifies either SERVERCALL_REJECTED or SERVERCALL_RETRYLATER, as returned by the object application.

This method can return the following values.

COM calls RetryRejectedCall on the caller's IMessageFilter interface immediately after receiving SERVERCALL_RETRYLATER or SERVERCALL_REJECTED from the IMessageFilter::HandleInComingCall method on the callee's IMessageFilter interface.

If a called task rejects a call, the application is probably in a state where it cannot handle such calls, possibly only temporarily. When this occurs, COM returns to the caller and issues RetryRejectedCall to determine whether it should retry the rejected call.

Applications should silently retry calls that have returned with SERVERCALL_RETRYLATER. If, after a reasonable amount of time has passed, say about 30 seconds, the application should display the busy dialog box; a standard implementation of this dialog box is available in the OLEDLG library. The callee may momentarily be in a state where calls can be handled. The option to wait and retry is provided for special kinds of calling applications, such as background tasks executing macros or scripts, so that they can retry the calls in a nonintrusive way.

If, after a dialog box is displayed, the user chooses to cancel, RetryRejectedCall returns -1 and the call will appear to fail with RPC_E_CALL_REJECTED.

If a client implements IMessageFilter and calls a server method on a remote machine, RetryRejectedCall will not be called.

IMessageFilter