I need to pass a line number from an object - powershell

Question

>$search="<table id="
$linenumber= Get-Content ".\145039.html" | select-string $search | Select-Object LineNumber
$search="</table>"
$linenumber2= Get-Content ".\145039.html" | select-string $search | Select-Object LineNumber
#$linenumber2
# the list of line numbers to fetch
$linesToFetch = $linenumber[2]..$linenumber2[2]
$currentLine = 1
$result = switch -File ".\145039.html" {
default { if ($linesToFetch -contains $currentLine++) { $_ }}
}
# write to file and also display on screen by using -PassThru
$result | Set-Content -Path ".\excerpt.html" -PassThru
Cannot convert the "#{LineNumber=6189}" value of type "Selected.Microsoft.PowerShell.Commands.MatchInfo" to type "System.Int32".
At line:10 char:1
+ $linesToFetch = $linenumber[2]..$linenumber2[2]
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [], RuntimeException
+ FullyQualifiedErrorId : ConvertToFinalInvalidCastException
$linenumber and $linenumber2 return values like below but I just need to get the number not the column header.
LineNumber
----------
6015
Also, the final version needs to loop through all the html files in a directory not just one static file.
Sorry, there is probably a better way to do this but not sure how.
Thanks in advance!
Did a lot of googling but could not find the right solution.
Updated code:
$search1="disconnect-status"
$linenumber1= Get-Content ".\145039.html" | select-string
$search1
| Select-Object -ExpandProperty LineNumber
$search2="</table>"
$linenumber2= Get-Content ".\145039.html" | select-string
$search2 | Select-Object -ExpandProperty LineNumber
# the list of line numbers to fetch
$linesToFetch = $linenumber1[3]..$linenumber2[1]
$currentLine = 1
$result = switch -File ".\145039.html" {
default { if ($linesToFetch -contains $currentLine++) { $_ }}
}
# write to file and also display on screen by using -PassThru
$result | Set-Content -Path ".\excerpt.html" -PassThru
_____________________________________________________________
Thank you # mklement0
This now works for one file at a time now I need it go select text from all the HTML files in the directory.

Answer 1

Your immediate problem is that you need to change Select-Object LineNumber (which, due to positional parameter binding, is equivalent to Select-Object -Property LineNumber) to Select-Object -ExpandProperty LineNumber.
That is, you must use Select-Object's -ExpandProperty parameter in order to only get the values of the input objects' .LineNumber properties - see this post.
That said, your approach can be optimized in a number of ways, allowing you to make do with only a switch statement:
$output = $false; $openTagCount = 0
$result =
switch -File .\145039.html {
'<table id=' {
if (++$openTagCount -eq 3) { $output = $true } # 3rd block found
continue
}
'</table>' {
if ($output) { break } # end of 3rd block -> exit
continue
}
default {
if ($output) { $_ } # inside 3rd block -> output line
}
}
Note: This extracts the lines inside the third <table> element that has an id attribute, as implied by your original solution attempt; the solution you later edited into the question works differently.
Taking a step back:
It looks like your input is HTML, so you're usually better off using HTML parsing to handle your input:
In Windows PowerShell you may be able to use Invoke-WebRequest relying on the Internet Explorer engine if present (it isn't anymore by default in recent Windows versions).
In recent versions of Windows and in PowerShell (Core) (v6+), you'll either need New-Object -Com HTMLFile - see this answer - or a third-party solution such as such as the PowerHTML module that wraps the HTML Agility Pack - see this answer.