How to send keystroke to executable? - powershell

Question

How can I enter a keystroke programmatically through a PowerShell script?
Write-Host -ForegroundColor Green 'Loading...'
Function EnterKey {
[Reflection.Assembly]::LoadWithPartialName('System.Windows.Forms')
#Where I want to get "|" keystroke programmatically
[System.Windows.Forms.SendKeys]::SendWait("{|}")
}
Function StartUp {
Write-Host "Environment"
$exe = ([IO.Path]::Combine("D:\7ZipApp\7ZipApp\7ZipApp\bin\Debug","7ZipApp.exe"))
& $exe 3 # argument 3 = 'Run local Sync'
EnterKey
Read-Host -Prompt $exe.ToString()
}
StartUp

Answer 1

Write-Host -ForegroundColor Green 'Loading...'
function StartUp {
Write-Host 'Environment'
$exe = Join-Path "D:\7ZipApp\7ZipApp\7ZipApp\bin\Debug" "7ZipApp.exe"
#& $exe 3 # argument 3 = 'Run local Sync'
start $exe -ArgumentList 3
Write-Host 'Type {|} to continue'
while ((Read-Host) -ne '{|}') {}
Read-Host -Prompt $exe.ToString()
}
StartUp

Answer 2

I have to go with the crowd here (from the comments):
I would abandon your approach. Too problematic.
My question was why you want to do it
The correct solution, then, is to get the author of 7zipapp.exe to fix the program so it stops doing that or to add a command-line parameter that prevents this behavior.
That said, if you want a total hack, and this program only takes ONE input, at the end presumably, then the below appears to work. I would use sparingly, perhaps never use it, but rather get the program fixed, but in my testing, this worked.
PowerShell:
$exe = 'C:\ConsoleApplication2\bin\Debug\ConsoleApplication2.exe'
'\r\n' | & $exe
Annoying C# program:
using static System.Console;
namespace ConsoleApplication2
{
class Program
{
static void Main(string[] args)
{
WriteLine("I will force you to hit Enter to exit.");
ReadLine();
}
}
}