roImageCanvas PurgeCachedImages - does it work

Archived
1

Has anyone used and gotten the roImageCanvas.PurgeCachedImages to work. If so what was the case.

I’m trying to access a CAM which needs refreshing at the same url over time. I’ve seen others have had a similar problem. I found that roImageCanvas had a method PurgeCachedImages but was not able to get it to work as I thought it would. To purge the image retrieved by a url and updating the image using the same url.

I tried a number of possible workarounds using roParagraph and roImageCanvas by closing the component and recreating it every time I need to refresh the url image.

while true
create component
while true
wait for message
exit while when needed
end while
end while

This failed even when I used roImageCanvas.PurgeCachedImages.

I did find a work around using roSlideShow. Apparently the above code works with one slide as the CAM’s url.

Has anyone found a better way of purging roku cache.

2

Generrally, just tag a random number onto the end of your URL, like:

“http://www.myserver.com/image.jpg?r=”+rnd(3000).tostr()

should force a new image download.

then perhaps run the purge function ever few minutes.

3

Thanks - didn’t occur to me that the server would ignore an extra parameter.