How to know end of PDF File on Auto IT - autoit

Question

I have an AutoIT script to open and scroll to end of PDF file by mouse action. By the number of times for scrolling is depended on the zoom percent and the number of pages. How do I determine the end of PDF file for configure the number of times for scrolling?
Below is the sample script. I fixed the number of times for scrolling is 15
Func OpenAllPDFFile($vardirectory)
If #error = 1 Then
MsgBox($MB_SYSTEMMODAL, "", "Path is invalid.", 2)
ElseIf #error = 4 Then
MsgBox($MB_SYSTEMMODAL, "", "No report(s) found.", 2)
ElseIf #error Then
MsgBox($MB_SYSTEMMODAL, "", "Fail to open report", 2)
Else
$FileArray = _FileListToArray($vardirectory, "*.pdf",1)
$NewFileArray = SortPDFFile($FileArray)
For $i = 0 To UBound($NewFileArray)-1
ShellExecute($vardirectory & "\" & $NewFileArray[$i])
ConsoleWrite("Opening pdf file: " & $NewFileArray[$i] & #CRLF)
if WinWaitActive($NewFileArray[$i]) Then
ConsoleWrite("Pdf file " & $NewFileArray[$i] & " is opened" & #CRLF)
WinSetState($NewFileArray[$i], "", #SW_MAXIMIZE)
Sleep($varSleep)
ControlClick($NewFileArray[$i], "", $varZoomPercent)
ControlSend($NewFileArray[$i], "", $varZoomPercent, $vPercent)
Send("{ENTER}")
Sleep($varSleep)
For $y = 0 To 15
If WinExists("[CLASS:AcrobatSDIWindow]") Then
MouseWheel($MOUSE_WHEEL_DOWN, 12)
Sleep($varSleepRead)
Else
ExitLoop
EndIf
Next
Else
ConsoleWrite("Could not find pdf file: " & #CRLF)
EndIf
WinClose("[CLASS:AcrobatSDIWindow]")
Next
EndIf
WinClose($varDUTPlot,"")
EndFunc

Answer 1

If you really just need to go to the end of the PDF I would use Page Down like this:
Send("{PGDN down}") # hold key down
Sleep(10000) # hold it for 10 sec
Send("{PGDN up}") # stop holding it
You can increase or lower the time just by editing the sleep time(in ms).
I don't know how to scale it with the PDF size.
If you know the pagecount it would be easy. ;)
$c = PAGES_IN_PDF
$t = $c * 200 # plan enough time for slow PCs
Sleep($t)