From: Taras Koval <kovaltaras@...>
Date: 2007-07-10T00:34:06+09:00
Subject: Re: Get file size before download (noobish question)

Taras Koval wrote:
> John Joyce wrote:
>>
>> On Jul 9, 2007, at 3:31 AM, Taras Koval wrote:
>>
>>> Guest wrote:
>>>> Hi,
>>>>
>>>> so the subject implies what i want to do, get the file size before
>>>> downloading.  i've seen posts about downloading the header, so if
>>>> possible, could someone give an example of this code???
>>>>
>>>> also, for files without a header, i tried using :content_length_proc
>>>> within the open-uri class, but it would seem that the file is being
>>>> downloaded, then tested for size (from the difference in time for
>>>> running my code)
>>>>
>>>> so if someone has any ideas as to getting filesize of a file (mp3
>>>> specifically) without a header... please help!
>>>>
>>>>
>>> That is not possible!
>>>
>> If you can ask the system the file is stored on, you can get its file 
>> size.
>>
>>
> Actually you can use JavaScript to get file size before uploading, I 
> know how to do that in IE and FF but there will be a browsers security 
> pop ups and user should confirm
> that you script will be checking their file system.
>
>
For IE:

function getFileSize(file) {
	var oas = new ActiveXObject("Scripting.FileSystemObject");
	var e = oas.getFile(file);
	var f = e.size;
	return f;
}