Determining Time Left In Donwload Process

[Eric M]

Ok ive been stumped on this for a while. Plus im not math wizard but I have made a program that will update all of my programs via the internet and I have the percent the two totals(amount downloaded, amount left) and I have the Kbps. I have all that info done but I cant figure out how to show the estimated amount of time left. If someone can help me I would greatly appreciate it!!
Thanx

[andymac]

Hi,
The important thing here is that if you don't know the file size, there is no way that you can know how long it's going to take to download.
So in pseudo code;

---START---

dim StartTime
dim CurrentTime
dim EndTime
dim FileSize
dim AmountDownloaded

StartTime = now()
filesize = filelen(Myfile)

'then at intervals which you choose, maybe every 1K or 10 seconds (whatever you want)

Amountdownloaded = however much you've downloaded

CurrentTime = now()

'Therefore

Duration = currenttime - starttime

'You know the amount you've downloaded, so you know that the amount you've got left to download is;

FileSize - AmountDownloaded

'You know that to download the amount you've got so far took "Duration" therefore the download rate it;

DownloadRate = Amountdownloaded / Duration

'So to download the remaining amount (assuming the same download rate) is going to be;

(FileSize - Amountdownloaded) / Downloadrate

Eg;

StartTime = 10 (seconds)
FileSize is 500bytes

After 15 seconds of downloading, we've downloaded 125bytes so

Duration = 15 (25-10)
Amountdownloaded = 90
Amount remainging to download = 375

Download rate = 90/15 = 6 bytes per second

So as we know we've got 500-90 bytes left to go;

(500-90) / 6 = 410/6 = 68.333 seconds from the Current time, so

End Time = Currenttime + 68.333, i.e., 25 + 68.333

= 93.333 seconds

Total duration will be 93.333-10 = 83.333

which is also 500 / 6


Hope that helps

Cheers

Andy

[MartinLiss]

Try something like this
Dim dblTotKBs As Double ' Total KBs in the file
Dim dblKBPS As Double ' Download speed
Dim dblKBsDownloaded As Double ' KBs downloaded
Dim dblSecsRemaining As Double

' dblTotKBs = 350000
' dblKBPS = 14000
' dblKBsDownloaded = 2550

dblSecsRemaining = (dblTotKBs - dblKBsDownloaded) / dblKBPS

MsgBox dblKBsDownloaded & " of " & dblTotKBs & " downloaded" _
& vbCrLf & vbCrLf _
& Format(dblSecsRemaining, 0) & " Seconds left"


------------------
Marty
Why is it called lipstick if you can still move your lips?