Is there a way to pre-fill out Read-Host in Powershell? - powershell

Question

I have a script that helps a user find if a file hash exists in a folder. After the user has entered the hash I determine what type of hash it is and if it is not supported or if the user missed a letter it will return to asking for a hash. For ease of use I want to be able to pre-fill out what the user had type in the previously so they do not need to start over.
while (1)
{
$hashToFind = Read-Host -Prompt "Enter hash to find or type 'file' for multiple hashes"
# Check if user wants to use text file
if ($hashToFind -eq "file" )
{
Write-Host "Be aware program will only support one has type at a time. Type is determined by the first hash in the file." -ForegroundColor Yellow
Start-Sleep -Seconds 3
$hashPath = New-Object system.windows.forms.openfiledialog
$hashPath.InitialDirectory = “c:\”
$hashPath.MultiSelect = $false
if($hashPath.showdialog() -ne "OK")
{
echo "No file was selected. Exiting program."
Return
}
$hashToFind = Get-Content $hashPath.filename
}
# Changes string to array
if ( $hashToFind.GetTypeCode() -eq "String")
{
$hashToFind+= " a"
$hashToFind = $hashToFind.Split(" ")
}
if ($hashToFind[0].Length -eq 40){$hashType = "SHA1"; break}
elseif ($hashToFind[0].Length -eq 64){$hashType = "SHA256"; break}
elseif ($hashToFind[0].Length -eq 96){$hashType = "SHA384"; break}
elseif ($hashToFind[0].Length -eq 128){$hashType = "SHA512"; break}
elseif ($hashToFind[0].Length -eq 32){$hashType = "MD5"; break}
else {echo "Hash length is not of supported hash type."}
}
I am newer to PowerShell so if there are any other comments they are welcome!

Answer 1

From Super User:
[System.Windows.Forms.SendKeys]::SendWait("yes")
Read-Host "Your answer"

Answer 2

I have came up with solution like this:
while (1)
{
$hashToFind = Read-Host -Prompt "Enter hash to find or type 'file' for multiple hashes. Enter 'R' for reply input"
if ($hashToFind -eq 'R' -and $PreviousInput)
{
$handle = (Get-Process -Id $PID).MainWindowHandle
$code = {
param($handle,$PreviousInput)
Add-Type #"
using System;
using System.Runtime.InteropServices;
public class Tricks {
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool SetForegroundWindow(IntPtr hWnd);
}
"#
[void][Tricks]::SetForegroundWindow($handle)
Add-Type -AssemblyName System.Windows.Forms
[System.Windows.Forms.SendKeys]::SendWait($PreviousInput)
}
$ps = [PowerShell]::Create()
[void]$ps.AddScript($code).AddArgument($handle).AddArgument($PreviousInput)
[void]$ps.BeginInvoke()
}
$PreviousInput = $hashToFind
# Check if user wants to use text file
if ($hashToFind -eq "file" )
{
$PreviousInput = $null
Write-Host "Be aware program will only support one has type at a time. Type is determined by the first hash in the file." -ForegroundColor Yellow
Start-Sleep -Seconds 3
$hashPath = New-Object system.windows.forms.openfiledialog
$hashPath.InitialDirectory = “c:\”
$hashPath.MultiSelect = $false
if($hashPath.showdialog() -ne "OK")
{
echo "No file was selected. Exiting program."
Return
}
$hashToFind = Get-Content $hashPath.filename
}
# Changes string to array
if ( $hashToFind.GetTypeCode() -eq "String")
{
$hashToFind+= " a"
$hashToFind = $hashToFind.Split(" ")
}
if ($hashToFind[0].Length -eq 40){$hashType = "SHA1"; break}
elseif ($hashToFind[0].Length -eq 64){$hashType = "SHA256"; break}
elseif ($hashToFind[0].Length -eq 96){$hashType = "SHA384"; break}
elseif ($hashToFind[0].Length -eq 128){$hashType = "SHA512"; break}
elseif ($hashToFind[0].Length -eq 32){$hashType = "MD5"; break}
else {echo "Hash length is not of supported hash type."}
}