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PowerShell function to run JavaScript/JQuery and return results back to PS, with timeout
# PowerShell function to run JavaScript/JQuery and return results back to PS, with timeout
# some web page with jQuery in it
$url = "http://jquery.com/"
Function ResetTimer
{
$script:startTime = [DateTime]::Now
}
Function IsTimeout([TimeSpan]$timeout)
{
return ([DateTime]::Now - $startTime) -ge $timeout
}
Function WaitForIE
{
$ie = $script:ie
Write-Debug "Waiting..."
ResetTimer
do {
if (IsTimeout ([TimeSpan]::FromSeconds(30))) {
Write-Error "IE response timed out."; ExitFailure
}
Start-Sleep -m 100
}
until ( $ie.ReadyState -eq 4 -and
$ie.Document.readyState -eq 'complete')
}
# Use this function to run JavaScript on a web page. Your $jsCommand can
# return a value which will be returned by this function unless $global
# switch is specified in which case $jsCommand will be executed in global
# scope and cannot return a value. If you received error 80020101 it means
# you need to fix your JavaScript code.
Function ExecJavaScript($ie, $jsCommand, [switch]$global)
{
if (!$global) {
$jsCommand = "document.body.setAttribute('PSResult', (function(){$jsCommand})());"
}
WaitForIE
$document = $ie.document
$window = $document.parentWindow
$window.execScript($jsCommand, 'javascript') | Out-Null
if (!$global) {
return $document.body.getAttribute('PSResult')
}
}
Function CheckJQueryExists
{
$result = ExecJavaScript $ie 'return window.hasOwnProperty("$");'
return ($result -eq $true)
}
$ie = New-Object -COM InternetExplorer.Application -Property @{
Navigate = $url
Visible = $true
}
do { Start-Sleep -m 100 } while ( $ie.ReadyState -ne 4 )
$jQueryExists = CheckJQueryExists $ie
echo "jQuery exists? $jQueryExists"
# make a jQuery call
ExecJavaScript $ie @'
// this is JS code, remember to use semicolons
var content = $('#home-content');
return content.text();
'@
# Quit and dispose IE COM
$ie.Quit()
[System.Runtime.Interopservices.Marshal]::ReleaseComObject($ie) | out-null
Remove-Variable ie
# Finds all empty/blank files and directories
function IsAllZeros($file) {
$bufferSize = [Math]::Pow(2, 16)
$stream = [System.IO.File]::OpenRead($file)
while ($stream.Position -lt $stream.Length) {
$buffer = new-object Byte[] $bufferSize
$bytesRead = $stream.Read($buffer, 0, $bufferSize)
for ($c = 0; $c -lt $bytesRead; $c++) {
if ($buffer[$c] -ne 0) {
$stream.Close()
return $false
}
}
}
$stream.Close()
return $true
}
dir -Recurse | % {
if ($_.PSIsContainer) {
if ($_.GetFileSystemInfos().Count -eq 0) {
Write-Output "Empty dir:`t`t$($_.FullName)"
}
}
else {
if ($_.Length -eq 0 -or (IsAllZeros $_.FullName)) {
Write-Output "Empty file:`t$($_.Length)`t$($_.FullName)"
}
}
}
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