## FileStream::WriteAsync method


Asynchronously writes a sequence of bytes to the current stream, advances the current position within this stream by the number of bytes written, and monitors cancellation requests.

```cpp
TaskPtr System::IO::FileStream::WriteAsync(const ArrayPtr<uint8_t> &buffer, int32_t offset, int32_t count, const Threading::CancellationToken &cancellationToken) override
```


| Parameter | Type | Description |
| --- | --- | --- |
| buffer | const ArrayPtr\<uint8_t\>\& | The array containing the bytes to write. |
| offset | int32_t | A 0-based index of the elemnet in **buffer** at which the subrange to write begins. |
| count | int32_t | The number of elements in the subrange to write. |
| cancellationToken | const Threading::CancellationToken\& | The token to monitor for cancellation requests. |

### ReturnValue

A task that represents the asynchronous write operation.

## See Also

* Typedef [TaskPtr](../../../system/taskptr/)
* Typedef [ArrayPtr](../../../system/arrayptr/)
* Class [CancellationToken](../../../system.threading/cancellationtoken/)
* Class [FileStream](../)
* Namespace [System::IO](../../)
* Library [Aspose.PDF for C++](../../../)