Callback functions

[BioHazard]

Was playing around with 'callback functions' tonight, and stumbled across an old project of mine from some time back (different incarnation, LOL). It's one of my favorites, so decided to make a few minor tweaks / improvements, to offer it up again as an example of using of callback-functions to define behavior in the Progress Object whilst syncing transfer-statistics on the HTTP.Download command.

So basically, this is an HTTP downloader (which although only single-threaded) will download an infinite series of files, sequentially. And show the progress and transfer-stats on each sequential download. It's pretty basic as far as downloaders go. But maybe someone here is 'cluey' enough to build upon the concept and make it into a 'true' file downloader by incorporating 'multi-threading'. I know for example, that Reteset's Multi-threaded Download Plugin can make this achievable - but all that's a bit 'beyond my pay-grade' at this stage.

Anyway, I'll leave it here for anyone interested in taking a look-see, yeah? Code's nice and clearly 'commented' - so easy to follow. Hope someone finds it helpful.

[startup]

To check connection do not use
IsConnected = HTTP.TestConnection("http://www.google.com", 20, 80, nil, nil);
but use
cnct = HTTP.GetConnectionState();
if cnct.Connected==true then

[startup]

like that

-- Ensures user has established internet-connection before attempting to use application
--Dialog.SplashFlash("AutoPlay\\Flash\\loader.swf", 3, false);
cnct = HTTP.GetConnectionState();
if cnct.Connected==true then
 Page.Jump("Page2");        
    else
     Paragraph.SetText("Paragraph1", "No Internet Connection Detected.\r\nEnsure you're connected and try again.");            
        -- Image object properties table.
         tblImageProps = {};
         tblImageProps.Height = 95;
         tblImageProps.Width = 98;
         tblImageProps.Y = 75;
         tblImageProps.X = 200;         
         Image.SetProperties("Image1", tblImageProps);
         Image.Load("Image1", "AutoPlay\\Images\\logo2.png");
end

[BioHazard]

Care to explain why? User manual has this to say on each method:

HTTP.GetConnectionState

Note: You cannot rely solely on the fact that the Connected result of HTTP.GetConnectionState returning true means that you have a valid active Internet connection. It is impossible for HTTP.GetConnectionState to determine if the entire connection to the Internet is functioning without sending a request to a server. This is why you need to send a request to determine if you are really connected or not.

HTTP.TestConnection

Note: The default proxy settings that are currently configured through Internet Explorer will be used for testing the connection by default, and is the recommended method. However if you require alternate proxy settings, they can be passed through the ProxyData parameter.

So, I'm not quite following your reasoning. Can you elaborate a bit on why you think it's a better method?

[startup]

HTTP.GetConnectionState check the internet connection only HTTP.TestConnection check the server ready state so what is the point in cheking google server in your code ?? we do not need any sever or page check HTTP.GetConnectionState is 100 time faster it is about speed man

[startup]

the difference between
HTTP.GetConnectionState and HTTP.TestConnection
is the difference between "instance" and "please wait"

[BioHazard]

Again, from the manual (paying particular attention to the parts highlighted in red):

HTTP.GetConnectionState
Note: You cannot rely solely on the fact that the Connected result of HTTP.GetConnectionState returning true means that you have a valid active Internet connection. It is impossible for HTTP.GetConnectionState to determine if the entire connection to the Internet is functioning without sending a request to a server. This is why you need to send a request to determine if you are really connected or not.

HTTP.TestConnection
Note: The default proxy settings that are currently configured through Internet Explorer will be used for testing the connection by default, and is the recommended method.

So, I ask again - what is your logic? ('Faster' does not trump 'reliability' or basic good coding practice).
But I thank you for your input, nevertheless. Keep the faith, brother.

[startup]

reliability ?? forgot about the manual because its point in unclear for you in few words HTTP.GetConnectionState is for pages HTTP.TestConnection is for the internet connection just give a try

[curious1]

why not do both save everyone a headache lmao.

[curious1]

test if the faster method returns false and if so .. then do the slower google route.

[curious1]

Was playing around with 'callback functions' tonight, and stumbled across an old project of mine from some time back (different incarnation, LOL). It's one of my favorites, so decided to make a few minor tweaks / improvements, to offer it up again as an example of using of callback-functions to define behavior in the Progress Object whilst syncing transfer-statistics on the HTTP.Download command.

So basically, this is an HTTP downloader (which although only single-threaded) will download an infinite series of files, sequentially. And show the progress and transfer-stats on each sequential download. It's pretty basic as far as downloaders go. But maybe someone here is 'cluey' enough to build upon the concept and make it into a 'true' file downloader by incorporating 'multi-threading'. I know for example, that Reteset's Multi-threaded Download Plugin can make this achievable - but all that's a bit 'beyond my pay-grade' at this stage.

Anyway, I'll leave it here for anyone interested in taking a look-see, yeah? Code's nice and clearly 'commented' - so easy to follow. Hope someone finds it helpful.

must admit that , that is a very good .apz there BioHazard. Good Work Mate

[curious1]

where does this function come from?

local strkbs = string.format("%.1f", TransferRate);

[BioHazard]

where does this function come from?

local strkbs = string.format("%.1f", TransferRate);

Local variable for displaying the download-speed, eh? Whereby "%.1f" represents a floating-point number with one digit after the decimal point. eg. 950.8 KB/S

It comes from the String Library over at Lua.org: https://www.lua.org/pil/20.html

Thank fcuk this thread didn't devolve into a debate on checking internet-connection status. The title is "Callback functions" after all. Thanks for your interest, curious1.

[curious1]

Interesting! , i was asking because I could not find string.format in the manual , but thanks for clearing that up for me
and no problemo , I was actually supposed to add this very type of thing into a project I was working on recently. I like the clean approach and all the stats/figgures/Information
displayed with this. Also very few lines of code which is always good.

[startup]

devolve into a debate on checking internet-connection status.

sorry if my remarks bothering you.
promise to keep away in future.
thanks for your patience.