UseBasicParsing does not return HTML form

Question

我正在爲網頁創建表單登錄監視器。下面是代碼：

$loginbase = '<input omitted>' 
$loginURL = $loginbase + '<input omitted>' 
$r = Invoke-WebRequest -Uri ($loginURL + 'logonform.jsp') 
return $r; 

$form = $r.Forms[0]; 

return $form 

$form.Fields['aps'] = '<input omitted>'; 
$form.Fields['usr'] = '<input omitted>'; 
$form.Fields['pwd'] = '<input omitted>'; 

$r = Invoke-WebRequest -Uri ($loginURL + $form.Action) -Method POST -Body $form.Fields; 

if ($r.Content -match 'setup()') { 

    if ($r.StatusCode -eq 200) { 

     Write-Host 'Message:' $r.StatusDescription; 
     Write-Host 'Statistic:' $r.StatusCode; 
     Exit 0; 
    } 

    Write-Host 'Message:' $r.StatusDescription; 
    Write-Host 'Statistic:' $r.StatusCode; 
    Exit 1; 
} 

Write-Host 'Message: Did not login'; 
Write-Host 'Statistic: 1'; 
Exit 1; 

這個工程監控平臺的就好了外面，但是當我把這個腳本到平臺中，我得到了以下錯誤：

Invoke-WebRequest : The response content cannot be parsed because the Internet Explorer engine is not available, or Internet Explorer's first-launch configuration is not complete. Specify the UseBasicParsing parameter and try again. 
At line:3 char:6 
+ $r = Invoke-WebRequest -Uri ($loginURL + 'logonform.jsp') 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+ CategoryInfo : NotImplemented: (:) [Invoke-WebRequest], NotSupportedException 
+ FullyQualifiedErrorId : WebCmdletIEDomNotSupportedException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand 

Cannot index into a null array. 
At line:5 char:1 
+ $form = $r.Forms[0]; 
+ ~~~~~~~~~~~~~~~~~~~ 
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException 
+ FullyQualifiedErrorId : NullArray 

Cannot index into a null array. 
At line:7 char:1 
+ $form.Fields['aps'] = '<input omitted>'; 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException 
+ FullyQualifiedErrorId : NullArray 

Cannot index into a null array. 
At line:8 char:1 
+ $form.Fields['usr'] = '<input omitted>'; 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException 
+ FullyQualifiedErrorId : NullArray 

Cannot index into a null array. 
At line:9 char:1 
+ $form.Fields['pwd'] = '<input omitted>'; 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+ CategoryInfo : InvalidOperation: (:) [], RuntimeException 
+ FullyQualifiedErrorId : NullArray 

Invoke-WebRequest : The remote server returned an error: (404) Not Found. 
At line:11 char:6 
+ $r = Invoke-WebRequest -Uri ($loginURL + $form.Action) -Method POST -Body $form. ... 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
+ CategoryInfo : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-WebRequest], WebException 
+ FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand 

在第一次的建議錯誤，我添加'-UseBasicParsing'到我最初的Invoke-WebRequest語句中。當我在監視平臺內部或外部運行腳本時，會發生的情況是沒有任何窗體或輸入域從HTML中被拖出。我得到如下：

StatusCode  : 200 
StatusDescription : OK 
Content   : <!-- 
        ©2010 - 2013 SAP AG or an SAP affiliate company. All rights reserved. 

        SAP and other SAP products and services mentioned herein as well as their respective logos are trademarks or registered... 
RawContent  : HTTP/1.1 200 OK 
        Content-Length: 2561 
        Content-Type: text/html;charset=utf-8 
        Date: Tue, 11 Oct 2016 15:31:12 GMT 
        Expires: 0 
        Set-Cookie: JSESSIONID=DE3280200E764687D90E63E50A65452F; Path=/AdminTools... 
Forms    : 
Headers   : {[Content-Length, 2561], [Content-Type, text/html;charset=utf-8], [Date, Tue, 11 Oct 2016 15:31:12 GMT], [Expires, 0]...} 
Images   : {} 
InputFields  : {} 
Links    : {} 
ParsedHtml  : 
RawContentLength : 2561 

香港專業教育學院試圖找到對谷歌和一個替代的解決方案我們的監控平臺的支持論壇，但也已經把太多瞭如何使用調用-WebRequest的標準教程之外。

Answer 1

您嘗試使用的功能（將HTML解析爲對象模型）需要Internet Explorer可用並已初始化。 -UseBasicParsing明確不會解析，你不需要它的情況下，IE不可用（如在服務器核心上）。

如果沒有運行服務器核心，IE實際上是可用的，那麼問題可能是這樣的：

Internet Explorer's first-launch configuration is not complete.

在這種情況下，只要運行IE瀏覽器的第一次，這應該修復它。

如果腳本作爲服務帳戶運行，請確保您使用該帳戶登錄一次並初始化IE（每個用戶）。