如何确保定义了@PreAuthorize？(How to ensure @PreAuthorize has been defined?)

 您将需要使用InetGet函数来保存PDF并检查URL以查看它是否是PDF文件。 
 
 这是一个使用InetGet的简单示例。 
 
InetGet("http://careers.stackoverflow.com/stack_overflow_careers.pdf", @ScriptDir & "\stack_overflow_careers.pdf")
 
 以下是在页面上查找所有PDF URL并下载这些PDF的示例。 
 
#include <IE.au3>
#include <Array.au3>

DownloadAllPDFs("http://careers.stackoverflow.com/resources/great-job-listing")

Func DownloadAllPDFs($URL)
    Local $oIE = _IECreate($URL)
    Local $oLinks = _IELinkGetCollection($oIE)
    Dim $aPDFLinks[1]

    For $oLink In $oLinks
        If StringInStr($oLink.href, ".pdf") Then
            _ArrayAdd($aPDFLinks, $oLink.href)
        EndIf
    Next

    Local $iArraySize = UBound($aPDFLinks) - 1

    ConsoleWrite("Number of PDF Files found: " & $iArraySize)
    ;_ArrayDisplay($aPDFLinks)
    If $iArraySize > 0 Then
        For $i = 1 To $iArraySize
            InetGet($aPDFLinks[$i], @ScriptDir & "\" & $i & ".pdf")
        Next
    EndIf
EndFunc   ;==>DownloadAllPDFs
 
 以下是导航到URL并下载文件（如果是PDF）的示例。 
 
#include <IE.au3>

NavigateAndDownload()

Func NavigateAndDownload()
    Local $oIE = _IECreate()
    _IENavigate($oIE, "http://careers.stackoverflow.com/stack_overflow_careers.pdf", 0)
    Sleep(5000)
    $sURL = _IEPropertyGet($oIE, "locationurl")
    If StringInStr($sURL, ".pdf") Then InetGet($sURL, @ScriptDir & "\test.pdf")
EndFunc 

You will want to use the InetGet function to save the PDF's and check the URL to see if it is a PDF file.
 
Here is a simple example using InetGet.
 
InetGet("http://careers.stackoverflow.com/stack_overflow_careers.pdf", @ScriptDir & "\stack_overflow_careers.pdf")
 
Here is an example of finding all PDF URL's on a page and downloading those PDF's.
 
#include <IE.au3>
#include <Array.au3>

DownloadAllPDFs("http://careers.stackoverflow.com/resources/great-job-listing")

Func DownloadAllPDFs($URL)
    Local $oIE = _IECreate($URL)
    Local $oLinks = _IELinkGetCollection($oIE)
    Dim $aPDFLinks[1]

    For $oLink In $oLinks
        If StringInStr($oLink.href, ".pdf") Then
            _ArrayAdd($aPDFLinks, $oLink.href)
        EndIf
    Next

    Local $iArraySize = UBound($aPDFLinks) - 1

    ConsoleWrite("Number of PDF Files found: " & $iArraySize)
    ;_ArrayDisplay($aPDFLinks)
    If $iArraySize > 0 Then
        For $i = 1 To $iArraySize
            InetGet($aPDFLinks[$i], @ScriptDir & "\" & $i & ".pdf")
        Next
    EndIf
EndFunc   ;==>DownloadAllPDFs
 
Here is an example of navigating to a URL, and downloading the file if it is a PDF.
 
#include <IE.au3>

NavigateAndDownload()

Func NavigateAndDownload()
    Local $oIE = _IECreate()
    _IENavigate($oIE, "http://careers.stackoverflow.com/stack_overflow_careers.pdf", 0)
    Sleep(5000)
    $sURL = _IEPropertyGet($oIE, "locationurl")
    If StringInStr($sURL, ".pdf") Then InetGet($sURL, @ScriptDir & "\test.pdf")
EndFunc