---
title: "receivePromisedFiles(atDestination:options:operationQueue:reader:)"
framework: appkit
role: symbol
role_heading: Instance Method
path: "appkit/nsfilepromisereceiver/receivepromisedfiles(atdestination:options:operationqueue:reader:)"
---

# receivePromisedFiles(atDestination:options:operationQueue:reader:)

Fulfills the promises at the specified destination.

## Declaration

```swift
func receivePromisedFiles(atDestination destinationDir: URL, options: [AnyHashable : Any] = [:], operationQueue: OperationQueue, reader: @escaping (URL, (any Error)?) -> Void)
```

## Parameters

- `destinationDir`: The destination location URL of the file promise.
- `options`: An options dictionary to pass additional data.
- `operationQueue`: The operation queue on which to call the reader block when the promised file is ready.
- `reader`: A block to be called on the supplied operationQueue when the promised file is ready to be read.

## Discussion

Discussion Call this method only when you’re accepting the file promise. All file promise receivers in a drag must specify the same destination location. The options dictionary is ignored for now. The reader block is called on the supplied operationQueue when the promised file is ready to be read. Avoid blocking the main thread while waiting for the file promise to be written (which can be a long process) by specifying an operation queue other than the main queue. When the source is an NSFilePromiseProvider, the reader block call is wrapped in a file coordination read. note: If writing the promised file fails, the reader block is still called with a non-nil error. There may be nothing in fileURL, or there may be a partial or corrupt file.