Formatting powershell Get-Content byte code from file

Question

I am able to get the byte code but 2 things I am trying to do here is

format the bytecode so that there are 2 digits per byte. The leading zeroes are excluded.
Remove spaces between the bytes themselves because they are taking up a lot of space.

gc -Raw -encoding byte "c:\picture.jpg" | % {write-host ('{0:x}' -f $_) -noNewline};

tried trim() but not sure if that is possible or where to put it.

mklement0 · Accepted Answer · 2023-12-13 03:12:42Z

3

The simplest - and most efficient - solution is to use .NET APIs:

In Windows PowerShell, use System.BitConverter.ToString, and remove the resulting - separators afterwards:

[System.BitConverter]::ToString(
  (Get-Content -Raw -Encoding Byte c:\picture.jpg)
) -replace '-'

In PowerShell (Core) 7+, use System.Convert.ToHexString, which directly yields the desired format:

[System.Convert]::ToHexString(
  (Get-Content -Raw -AsByteStream c:\picture.jpg)
)

Note:

In principle, the Windows PowerShell solution also works in PowerShell (Core), if it weren't for the frivolous syntactic change from -Encoding Byte to -AsByteStream that occurred between the two PowerShell editions - see GitHub issue #7986.

edited Dec 13, 2023 at 3:12

answered Dec 13, 2023 at 2:55

mklement0

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3 Comments

shawnixer Over a year ago

I'm looking for a command that does this since it is being run as part of a c++ program

mklement0 Over a year ago

@shawnixer, I don't understand your comment. You're free to invoke the above from any environment, either via the PowerShell CLI (powershell.exe for Windows PowerShell, pwsh for PowerShell (Core) 7+)) or - from a .NET application - via the PowerShell SDK.

shawnixer Over a year ago

You are correct, I was focused on something else. Thank you.

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