Roku Developer Program

[leeladhar]

Hi,

I am using SimplePoster.brs, How can we achieve below functionality.

From XML Feed, I get an image name, I want to check whether that file exists, if it doesn't exist then i need to show a default image

This is what i want to do, how to check the file_exists functionality in BrightScript ?

if(file_exists(currShow@hdImg))
Item.hdImg = validstr(currShow@hdImg)
else
Item.hdImg = "pkg:/images/default.png"
end if

For now when I try to use an non exisitng file name i am getting error, ***ERROR: Missing or invalid PHY
After searchng forums, i got to know that we can do error_handling using Eval(), but can some one explain how to use it in above scenario ?

Thanks
Leeladhar

[RokuChris]

To check for the existence of a local file, the roFileSystem component has an Exists() function.

If you want to check for the existence of a remote file, you could use the roURLTransfer component to perform a head request on the URL. Doing so for every poster item in your channel would probably cause performance issues though.

[leeladhar]

Thanks RokuChris, that worked perfectly 🙂

Leeladhar

[leeladhar]

This is the function I have written for this

Function fileExists(fileName As String) As Boolean
	
    LocalFile = CreateObject("roRegex", "pkg:", "i")
    LiveFile  = CreateObject("roRegex", "http:", "i")
    
    if(true = LocalFile.IsMatch(fileName))
	        LocalFileBrowser = CreateObject("roFileSystem")
	        return LocalFileBrowser.Exists(fileName)
    else if(true = LiveFile.IsMatch(fileName))
	        print "fileName = ";  fileName
	        LiveFileBrowser = CreateURLTransferObject(fileName)
	        LiveFileStatus = LiveFileBrowser.Head()
	       
	        if( "200" = tostr(LiveFileStatus.GetResponseCode()) OR "304" = tostr(LiveFileStatus.GetResponseCode()))
	                   return true
	        else
	                   return false
	        end if
    else
	         return false
    end if
    
End Function