Shoutbox

I've been considering this too, but I haven't seen any possibility (yet).

Anyway, I'm off now, I'll think of it tomorrow

quote:

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Originally posted by CookieRevised
when you download a file with your browser, it usually tells you also how big the file is and thus being able to show you a progress dialog. So, find out how they do that (probably sending some kind of request first) and do the same in your script.

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code:

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var url  = 'http://www.google.co.uk/intl/en_uk/images/logo.gif';
var http = new ActiveXObject('Microsoft.XMLHTTP');
http.open('HEAD', url, true);
http.onreadystatechange = function(){
   if(http.readyState == 4){
      if(http.status == 200){
         Debug.Trace(http.getResponseHeader('Content-Length'));
      }
   }
}
http.send(null);

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Doesn't always work though, depends if the header is sent (only seems to be sent on static files). No other way of getting the size before downloading that I know of...

I just was looking around too, and found roughly the same thing. However, it should be done with readyState 3, not with 4.... (as 4 is triggered when done)?

http://www.sitepoint.com/blogs/2004/05/26/xmlhttp...vascript-closures/

code:

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86                // Called multiple while downloading in progress
87                case 3:
88                    // Notify user handler of download progress
89                    try {
90                        // Get the total content length
91                        // -useful to work out how much has been downloaded
92                        try {
93                            var contentLength = client.xmlhttp.getResponseHeader("Content-Length");
95                        } catch ( e) {
96                            var contentLength = NaN;
97                        } 
98     
99                        // Call the progress handler with what we've got
100                        client.userhandler.onProgress(
101                            client.xmlhttp.responseText,
102                            contentLength
103                        );
104     
105                    } catch ( e) { /* Handler method not defined */ }
106                break;

...

131        onProgress: function(responseText, length) {
132            echo("Downloaded "+responseText.length+" of "+length+"<br>");
133        },

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quote:

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Originally posted by CookieRevised
I just was looking around too, and found roughly the same thing. However, it should be done with readyState 3, not with 4....

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That's with a full GET request with the whole file, my code is sending a HEAD request which doesn't download the whole file but just the headers.

I tried it in readyState 3 just in case and it throws a very descriptive "Unspecified error" It seems the response (getResponseHeader, responseText etc.) can't be accessed until the request is complete?

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Edit: found this:

quote:

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Originally posted by http://msdn.microsoft.com/en-us/library/ms534361(VS.85).aspx

3 (Receiving)     Some data has been received. responseText is not available. responseBody is not available.
4 (Loaded)    All the data has been received. responseText is available. responseBody is available.

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The remarks also provide a couple of possibilities that could be used, I shall experiment further

@ CookieRevised:

I have checked your code on the site you've linked to, and found this in the code:

// Mozilla only implementation!  (Line 6)

I don't know if this is imprtant, but I'll give it a try.

@Eljay:

Following code is based on yours:

code:

---

function OnEvent_Initialize(MessengerStart) {
    if(Messenger.MyStatus > STATUS_UNKNOWN) {
        var url  = "http://tom.zegiklekkerniet.googlepages.com/DateCalculator.plsc";
        var http = new ActiveXObject("Microsoft.XMLHTTP");
        http.open("HEAD", url, true);
        http.onreadystatechange = function() {
            if(http.readyState == 4 && http.status == 200) {
                FileSize = http.getResponseHeader("Content-Length");
                Debug.Trace("> " + FileSize);
            }
        }
        http.send(null);
    }
}

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Debugger says "> 261048" and Windows' "Properties" window: "261.048 bytes".. Seems to work perfectly

quote:

---

Originally posted by SmokingCookie
@ CookieRevised:

I have checked your code on the site you've linked to, and found this in the code:

// Mozilla only implementation!  (Line 6)

I don't know if this is imprtant, but I'll give it a try.

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Very important actually.

Mozilla and MSIE have the xmlhttp object implemented differently.  I thought the code was for MSIE, showing an alternative way for something you could do in Mozilla.... I guess it was the other way around.... That's what you get when you're hasty , sorry...

quote:

---

Originally posted by Eljay
Edit: found this:

quote:

---

Originally posted by http://msdn.microsoft.com/en-us/library/ms534361(VS.85).aspx

3 (Receiving)     Some data has been received. responseText is not available. responseBody is not available.
4 (Loaded)    All the data has been received. responseText is available. responseBody is available.

---

The remarks also provide a couple of possibilities that could be used, I shall experiment further

---

cool... ServerXMLHTTP seems promissing a first sight. the IXMLHTTP object needs a language to be set for viewing webpages in order to work if I read it correctly.

quote:

---

Originally posted by CookieRevised

Mozilla and MSIE have the xmlhttp object implemented differently.  I thought the code was for MSIE, showing an alternative way for something you could do in Mozilla.... I guess it was the other way around.... That's what you get when you're hasty , sorry...

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Woo, I've been smarter than CookkieRevised for the first (and the last) time in my life

Anyway, I have inserted Eljay's code and it works now

quote:

---

Originally posted by CookieRevised
cool... ServerXMLHTTP seems promissing a first sight. the IXMLHTTP object needs a language to be set for viewing webpages in order to work if I read it correctly.

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Yes, that ServerXMLHTTP thingy looks interesting, as the readyState property will only be set to 2 (LOADED) when the headers are already loaded, in contrast to the 'normal' XMLHTTP request where the LOADED state is set directly after send() is called. The ServerXMLHTTP also allows us to get partial data during the process...

I think I'll give this a try today.

EDIT: Okay, it doesn't work. The only way to get the partial data is through either the responseStream or responseBody properties, which are not supported by the JScript environment. If I try to get those properties, I get the following (Dutch) error:

quote:

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De gegevens die nodig zijn voor deze bewerking zijn nog niet beschikbaar.

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which means:

quote:

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The data needed for this operation isn't available yet.

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The responseText and responseXML properties aren't given any value during interactive mode, so they give the same error. This is quite sad, because it would have opened very interesting possibilities for scripting.

Because other methods are not working (as experimented in this thread), I have brought in a suggestion for a MsgPlus.DownloadFile enhancement.

You can get partial downloads by using the APIs of WININET.DLL directly. I've done this a long time ago in a big Excel project, which I completely forgot about.