# IMessageFilter::RetryRejectedCall

A client-based method that gives the application an opportunity to display a dialog box so the user can retry or cancel the call, or switch to the task identified by threadIDCallee.

DWORD RetryRejectedCall(

HTASK threadIDCallee, | //Server task handle
DWORD dwTickCount, | //Elapsed tick count
DWORD dwRejectType | //Returned rejection message
); |

Parameters

threadIDCallee
  [in] Handle of the server task that rejected the call.
dwTickCount
  [in] Number of elapsed ticks since the call was made.
dwRejectType
  [in] Specifies either SERVERCALL_REJECTED or SERVERCALL_RETRYLATER, as returned by the object application.

Return Values

-1
  The call should be canceled. OLE then returns RPC_E_CALL_REJECTED from the original method call.
Value >= 0 and <100
  The call is to be retried immediately.
Value >= 100
  OLE will wait for this many milliseconds and then retry the call.

Remarks

OLE calls RetryRejectedCall on the caller’s IMessageFilter immediately after receiving SERVERCALL_RETRYLATER or SERVERCALL_REJECTED from the IMessageFilter::HandleInComingCall method on the callee’s IMessageFilter.

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, OLE returns to the caller and issues IMessageFilter::RetryRejectedCall to determine if 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.