<!--
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  "identifier" : "/documentation/BlockStorageDeviceDriverKit/IOUserBlockStorageDevice/Complete",
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  "title" : "Complete"
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# Complete

Indicates that the dext completed an asynchronous call.

```
virtual void Complete(uint32_t requestID, kern_return_t status);
```

## Parameters

`requestID`

An opaque identifier, originally provided in the corresponding `DoAsync…` call.

`status`

The status of the request.

## Discussion

The dext calls this method to indicate completion of an asynchronous call to methods like [`DoAsyncUnmap`](/documentation/BlockStorageDeviceDriverKit/IOUserBlockStorageDevice/DoAsyncUnmap), [`DoAsyncSynchronize`](/documentation/BlockStorageDeviceDriverKit/IOUserBlockStorageDevice/DoAsyncSynchronize), or [`DoAsyncEjectMedia`](/documentation/BlockStorageDeviceDriverKit/IOUserBlockStorageDevice/DoAsyncEjectMedia). Use the `requestID` parameter to determine which call resulted in this callback.

---

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