Roku Developer Program

[belltown]

I may be wrong, but I believe that roUrlTransfer automatically handles HTTP redirects (302). The underlying cUrl library should take care of that for you. There shouldn't be any need to read the headers yourself and send off another request for the redirected url.

In the first code you posted, you called AsyncGetToFile immediately followed by a call to AsyncHead, so you're issuing two simultaneous asynchronous requests to the same url, one for the whole file and one for just the headers. If the AsyncHead request completes first, your loop terminates before the AsyncGetToFile request completes, so you have no way of knowing whether the AsyncGetToFile call completed successfully.

In the last code you posted, if you get a 403 error that means that your access to that resource is forbidden; you won't be able to read it due to some security violation.

I would use something like this to do what you're trying to do:

Function getImageToFile(url As String, filename As String, timeout As Integer) As Boolean
	ahttp = CreateObject("roUrlTransfer")
	port = CreateObject("roMessagePort")
	ahttp.SetPort(port)
	ahttp.SetUrl(url)
	ahttp.AddHeader("User-Agent", "Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A543 Safari/419.3")
	ahttp.EnableEncodings(True)

	result = ahttp.AsyncGetToFile(filename)
	If result
		While True
			msg = Wait(timeout, port)
			If Type(msg) = "roUrlEvent"
				Print "AsyncGetToString: msg.GetResponseCode() = " + msg.GetResponseCode().ToStr () + ". msg.GetFailureReason () = " + msg.GetFailureReason ()
				If msg.GetResponseCode() <> 200
					result = False
				Endif
				Exit While
			Else If Type (msg) = "Invalid"
				Print "AsyncGetToString: timeout"
				ahttp.AsyncCancel()
				result = False
				Exit While
			Else
				Print "AsyncGetToString: Unknown event: " + Type (msg)
			Endif
		End While
	Endif

	Return result

End Function

Also, when posting code in the forums, it's a lot easier to read if you enclose your code in "Code" tags. (Just click the "Code" button above the text entry box then insert your code between the code and /code tags).

[bmn]

Belltown, thanks for your reply! hey i tried that code but still no luck, i get:

"AsyncGetToString: timeout"

but when i try to load the url through firefox, the image loads fine..

why could this be?

[belltown]

Have you tried calling it with a timeout value of zero? And are you able to load other images from other locations using the same code?

See if this works, for example:

if getImageToFile("http://blog.roku.com/wp-content/uploads/2012/01/fan_o_da_month1.jpg", "tmp:/test.jpg", 0)
    print "Image Loaded"
else
    print "Image failed to load"
endif

[bmn]

Belltown, yes i tried loading other images from other sites, and they work fine, not only did i load them using the code i submitted but also using the canvas component.

But these other images load fine in firefox, and the only difference with a simple http call is this 302 redirect thing...

Well i also tried retrieving the image the http header:target of the 302 redirect has, which would be the actual image, and it doesnt even load that one...

Im really lost here...

[bmn]

belltown, i did some more testing.. i used your first code, and what i did was to load the images to be loaded by the canvas component before this one loads them, so they would be cached...

now I'm getting:

AsyncGetToString: msg.GetResponseCode() = 200. msg.GetFailureReason () = OK

so they seem to have loaded.. but canvas does not show them...

this is getting most weird!

[bmn]

Well there were some issues regarding the firewall, apparently the image url was blocked for roku because it wasnt authentified... either way roku is not handling the redirect automatically...so this error should be taken care manually

has anyone an idea different to load the url asynchronically and get the http header? perhaps some configuration?

thanks!

[bmn]

Sorry about all the fuzz... we were having some problems with the firewall..


sorry, and thanks a lot!