Output binary data on PowerShell pipeline

Question

I need to pipe some data to a program\'s stdin.

1. First 4 bytes are a 32 bit unsigned integer representing the length of the data. These 4 bytes are exactly the sam

Answer 1

Would this work for you?

$fileName = "C:\test.txt"
$data = [IO.File]::ReadAllText($fileName)
$prefix = ([BitConverter]::GetBytes($data.Length) | foreach-object {
  "\x{0:X2}" -f $_
}) -join ""
"{0}{1}" -f $prefix,$data

You can replace "\x{0:X2}" -f $_ with $_ -as [Char] if you want $prefix to contain the raw data representations of the bytes.