Super simple download with progress bar - download

Question

Setting up an asynchronous download in AutoHotkey is a pain, but this is is necessary if you want to run some code during the download, like for example updating progress bar.
So the question is:
Is there a short and simple way of downloading a file with a progress bar, without including huge 1000+ lines libraries?

Answer 1

I came up with that code quite some time ago and you can still find it on the AHK forums, however, why not share it with the Stackoverflow community:
DownloadFile(UrlToFile, SaveFileAs, Overwrite := True, UseProgressBar := True, ExpectedFileSize := 0) {
;Check if the file already exists and if we must not overwrite it
If (!Overwrite && FileExist(SaveFileAs))
Return
;Check if the user wants a progressbar
If (UseProgressBar) {
;Initialize the WinHttpRequest Object
WebRequest := ComObjCreate("WinHttp.WinHttpRequest.5.1")
;Download the headers
WebRequest.Open("HEAD", UrlToFile)
WebRequest.Send()
try {
;Store the header which holds the file size in a variable:
FinalSize := WebRequest.GetResponseHeader("Content-Length")
} catch e {
; Cannot get "Content-Length" header
FinalSize := ExpectedFileSize
}
;Create the progressbar and the timer
Progress, , , Downloading..., %UrlToFile%
LastSizeTick := 0
LastSize := 0
; Enable progress bar updating if the system knows file size
SetTimer, __UpdateProgressBar, 1500
}
;Download the file
UrlDownloadToFile, %UrlToFile%, %SaveFileAs%
;Remove the timer and the progressbar because the download has finished
If (UseProgressBar) {
Progress, Off
SetTimer, __UpdateProgressBar, Off
}
Return
;The label that updates the progressbar
__UpdateProgressBar:
;Get the current filesize and tick
CurrentSize := FileOpen(SaveFileAs, "r").Length ;FileGetSize wouldn't return reliable results
CurrentSizeTick := A_TickCount
;Calculate the downloadspeed
SpeedOrig := Round((CurrentSize/1024-LastSize/1024)/((CurrentSizeTick-LastSizeTick)/1000))
SpeedUnit := "KB/s"
Speed := SpeedOrig
if (Speed > 1024) {
; Convert to megabytes
SpeedUnit := "MB/s"
Speed := Round(Speed/1024, 2)
}
SpeedText := Speed . " " . SpeedUnit
;Save the current filesize and tick for the next time
LastSizeTick := CurrentSizeTick
LastSize := FileOpen(SaveFileAs, "r").Length
if FinalSize = 0
{
PercentDone := 50
} else {
;Calculate percent done
PercentDone := Round(CurrentSize/FinalSize*100)
SpeedText := SpeedText . ", " . Round((FinalSize - CurrentSize) / SpeedOrig / 1024) . "s left"
}
;Update the ProgressBar
Progress, %PercentDone%, %PercentDone%`% (%SpeedText%), Downloading..., Downloading %SaveFileAs% (%PercentDone%`%)
Return
}
Here are some examples:
Example 1 - Download a firefox setup with a progressbar and overwrite it if it already exists on the disk:
DownloadFile("http://download-installer.cdn.mozilla.net/pub/firefox/releases/26.0/win32/en-US/Firefox%20Setup%2026.0.exe", "firefox_setup.exe")
Example 2 - Download Autohotkey with a progressbar and don't overwrite it if it already exists:
Url = http://ahkscript.org/download/ahk-install.exe
DownloadAs = AutoHotkey_L Installer.exe
Overwrite := False
UseProgressBar := True
DownloadFile(Url, DownloadAs, Overwrite, UseProgressBar)
Example 3 - Download a CCleaner setup and open a Save As dialog, asking the user where to save the file, overwriting it if already exists:
FileSelectFile, SaveAs, S, ccsetup410.exe
DownloadFile("http://download.piriform.com/ccsetup410.exe", SaveAs, True, True)