File.createReadwriteAsync

void createReadwriteAsync(gio.types.FileCreateFlags flags,  int  ioPriority,  gio.cancellable.Cancellable cancellable =  null,  gio.types.AsyncReadyCallback callback =  null)

Asynchronously creates a new file and returns a stream for reading and writing to it. The file must not already exist.

For more details, see [gio.file.File.createReadwrite] which is the synchronous version of this call.

When the operation is finished, callback will be called. You can then call [gio.file.File.createReadwriteFinish] to get the result of the operation.

Parameters

`flags`	a set of #GFileCreateFlags
`ioPriority`	the [I/O priority][io-priority] of the request
`cancellable`	optional #GCancellable object, null to ignore
`callback`	a #GAsyncReadyCallback to call when the request is satisfied