AddVirtual Method

Adds a file placeholder to the archive.

Syntax

archivewriter.addVirtual(path, [callback])

Callback

The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).

The callback for this method is defined as:

function(err, data){ }

'err' is the error that occurred. If there was no error, then 'err' is 'null'.

'data' is the value returned by the method.

'err' has 2 properties which hold detailed information:

err.code
err.message

Remarks

Use this method to add a placeholder for the entry the contents of which is to be provided on the fly from a stream or buffer.

Pass the path to the entry within the archive (e.g. Reports/report2020.csv) via the Path parameter. After the entry has been added, use PrepareFile event or Files property to tune up the type of the data source (file, stream, or memory buffer). During the actual compression, provide the contents of the entry in a stream or buffer in the BeforeCompressFile event handler.

This method returns the index of the new entry in the Files collection.