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# getCompleter method
Completer getCompleter
(int txid)
<p>Returns the completer associated with the given response message.</p>
<p>Used by subclasses of <a href="../../package-fidl_fidl/AsyncProxy-class.md">AsyncProxy&lt;T&gt;</a> to retrieve registered completers when
handling response messages.</p>
## Implementation
```dart
Completer? getCompleter(int txid) {
final Completer? result = _completerMap.remove(txid);
if (result == null) {
proxyError(FidlError('Message had unknown request id: $txid'));
}
return result;
}
```