# WriteMessage

Writes a text string over a Native Mode connection whenever the spreadsheet updates. WriteMessage outputs the string over the same connection as the ReadMessage tool.

Note: Insert a ReadMessage function Functions are tools that are available in Spreadsheet for processing and analyzing acquisitions or other results. You can add functions to your Spreadsheet job to create tool chains and produce results for specific applications. in the spreadsheet to establish the Native Mode connection.
Inputs

The WriteMessage function has the following syntax:

WriteMessage(Event, String)

See the table for a description of the available parameters.

Parameter | Description
--- | ---
Event | An external event that forces an update. This parameter must be a reference to one of the following: The Image data structure in cell A1. A cell containing an Event function. For more information, see Event. A cell containing a Button function. For more information, see Button.
String | A string, or a reference to a cell containing a string.

Outputs

Returns | A Message data structure containing the string to write, or #ERR if the input String value is invalid.