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hmtl's questions

Martin Hope
hmtl
Asked: 2025-04-10 23:29:51 +0800 CST
  • 7

我正在使用 PowerShell 和 -Parallel 选项来加速一个使用 ImageMagick 检查文件格式的脚本。该脚本无需并行处理也能运行，但处理大量文件时速度太慢。当我添加 -Parallel 选项时，总是出现错误。代码如下——有人能帮我找出问题所在吗？

错误：

无法使用指定的命名参数解析参数集。缺少一个或多个参数、不允许同时使用参数，或者为所选参数集提供的参数数量不足。

代码：

$files | ForEach-Object -Parallel {
    param ($file, $magickPath, $errorLogFile)

    try {
        # Run ImageMagick to identify the format
        $output = & $magickPath identify -ping -quiet -format "%m" $file.FullName

        # Check if the image is NOT JPEG or PNG
        if ($output -ne "JPEG" -and $output -ne "PNG") {
            $fileName = $file.Name
            "$fileName - $output"
        }
    }
    catch {
        # Log errors
        $errorMsg = "Error processing file: $($file.FullName). Error: $($_.Exception.Message)"
        $errorMsg | Out-File -FilePath $errorLogFile -Append
    }
} -ThrottleLimit 8 -ArgumentList $magickPath, $errorLogFile | ForEach-Object {
    if ($_ -ne $null) {
        $nonJpegPngFiles += $_
    }
}

更新：

# Folder where the images are located
$folderPath = "C:\Users\johndoe\Documents\saved images"

# File where unsupported image names will be saved
$outputFile = "C:\Users\johndoe\Documents\Unsupported list\unsupported_images_list.txt"

# Path to ImageMagick executable
$magickPath = "C:\Program Files\ImageMagick-7.1.1-016\magick.exe"

# Get all files in the folder
$files = Get-ChildItem -Path $folderPath -File

# Process files in parallel
$result = $files | ForEach-Object -Parallel {
    # Run ImageMagick to identify the format, redirecting stderr to stdout
    $output = & $using:magickPath identify -ping -quiet -format '%m' $_.FullName 2>&1

    # Return the file path and output for filtering later
    [pscustomobject]@{
        Path   = $_.FullName
        Output = $output
    }
} -ThrottleLimit 8

# Filter files that are not JPEG or PNG
$unsupportedFiles = $result | Where-Object { $_.Output -notin 'JPEG', 'PNG' }

# If unsupported files exist, write them to the output file
if ($unsupportedFiles.Count -gt 0) {
    $unsupportedFiles | Select-Object -ExpandProperty Path | Out-File -FilePath $outputFile
    Write-Host "List of unsupported files has been saved to $outputFile."
} else {
    Write-Host "No unsupported files found."
}
multithreading