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 of the request
`cancellable`	optional #GCancellable object, null to ignore
`callback`	a #GAsyncReadyCallback to call when the request is satisfied