Run a Program inside a loop in powershell

Question

I have exe of cwebp that basically can be run like

cwebp.exe image1.jpg -o image1.webp

I'm trying to create simple powershell script to run the exe for all image inside a folder using powershell script, I do have create some script like this

param ( [string]$FolderName)
Get-ChildItem $FolderName | ForEach-Object {
    &"D:\Downloads\libwebp\bin\cwebp.exe" $_.FullName -o $_.BaseName + ".webp"
}

so I can run the ps1 file with the folder name like

batch-script.ps1 ".\images"

but when I run it, got error

SHCreateStreamOnFile((const LPTSTR)filename, STGM_READ, stream) failed 80070002
Error opening input file .webp (80070002)
OpenInputStream(filename, &stream) failed 80070002
cannot open input file '.webp'
Error! Could not process file .webp
Error! Cannot read input picture file '.webp'

the folder content just have jpg image name image1.jpg, image2.jpg, did I miss something?

You should simply output the created command line you create inside your loop to check what's wrong. — Olaf
– Olaf, Commented Feb 14, 2020 at 15:23

dschwartz0815 · Accepted Answer · 2020-02-14 15:40:09Z

1

Try something like this:

param ( [string]$FolderName)

$images = Get-ChildItem $FolderName

foreach ($img in $images) {
  $outputName = $img.DirectoryName + "\" + $img.BaseName + ".webp"
  &"D:\Downloads\libwebp\bin\cwebp.exe" $img.FullName -o $outputName
}

answered Feb 14, 2020 at 15:40

dschwartz0815

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1 Comment

Wuryantono Over a year ago

Thank you, this is correct when I test it, looks like I need to create the output file first and my code also missing the DirectoryName that make the converted image is placed in the same folder as the ps1 file.

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