How can i make hyperlink to local file for dowloading

Question

How can I make hyperlink to a local file for downloading it, it seams that only www links work in web Ui.
Thanks

Answer 1

If we assume that you have a LabVIEW application running on your cRIO that is exposing some data through web services, there are a couple of possibilities.
You can create a web service call that returns the log data. In order for the browser to treat this as a file, you must set the correct content type in the http header. To do this you can't use the default form of data output. Instead you must create an "httpRequestID" input to your web service VI. With this you can call "Write Response.vi" to give the log data and "Set HTTP Header.vi" to specify the type (text/text probably works for a log). You can look at "examples\comm\webservices\address book\FindContacts.vi" to see an example of calling these 2 VIs. Once you create that web service entry point, you can set that as the URL of the hyperlink control and it should work.
Another option is to have the cRIO application write to a log file that is under the root of the web server running on the machine. (This is the same place the xap for your Web UI Builder application is put.) This file could then be served up through the web server just like any other file.
With either of these solutions there may be concerns about the browser caching results rather than requesting new content each time. There are additional values that can be set in the http headers with the first solution that can help with this, but I think there is still some variation between browsers.