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Convert PDF To PNG From URL Asynchronously - PowerShell

PDF to PNG sample in PowerShell demonstrating ‘Convert PDF To PNG From URL Asynchronously’

ConvertPdfToPngFromUrlAsynchronously.ps1
# Cloud API asynchronous "PDF To PNG" job example.
# Allows to avoid timeout errors when processing huge or scanned PDF documents.

# The authentication key (API Key).
# Get your own by registering at https://app.pdf.co
$API_KEY = "***********************************"

# Direct URL of source PDF file.
$SourceFileUrl = "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/pdf-to-image/sample.pdf"
# Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'.
$Pages = ""
# PDF document password. Leave empty for unprotected documents.
$Password = ""
# (!) Make asynchronous job
$Async = $true


# Prepare URL for `PDF To PNG` API call
$query = "https://api.pdf.co/v1/pdf/convert/to/png"

# Prepare request body (will be auto-converted to JSON by Invoke-RestMethod)
# See documentation: https://apidocs.pdf.co
$body = @{
    "password" = $Password
    "pages" = $Pages
    "url" = $SourceFileUrl
    "async" = $Async
} | ConvertTo-Json

try {
    # Execute request
    $response = Invoke-WebRequest -Method Post -Headers @{ "x-api-key" = $API_KEY; "Content-Type" = "application/json" } -Body $body -Uri $query

    $jsonResponse = $response.Content | ConvertFrom-Json

    if ($jsonResponse.error -eq $false) {
        # Asynchronous job ID
        $jobId = $jsonResponse.jobId
        # URL of generated JSON file available after the job completion; it will contain URLs of result PDF files.
        $resultJsonFileUrl = $jsonResponse.url

        # Check the job status in a loop. 
        do {
            $statusCheckUrl = "https://api.pdf.co/v1/job/check?jobid=" + $jobId
            $jsonStatus = Invoke-RestMethod -Method Get -Headers @{ "x-api-key" = $API_KEY } -Uri $statusCheckUrl

            # Display timestamp and status (for demo purposes)
            Write-Host "$(Get-date): $($jsonStatus.status)"

            if ($jsonStatus.status -eq "success") {
                # Download JSON file with URLs of result PDF files
                $jsonPngUrls = Invoke-RestMethod -Method Get -Uri $resultJsonFileUrl

                # Download generated PNG files
                $part = 1;
                foreach ($url in $jsonPngUrls) {
                    $localFileName = ".\page$($part).png"

                    Invoke-WebRequest -Headers @{ "x-api-key" = $API_KEY } -OutFile $localFileName -Uri $url

                    Write-Host "Downloaded `"$($localFileName)`""
                    $part++
                }
                break
            }
            elseif ($jsonStatus.status -eq "working") {
                # Pause for a few seconds
                Start-Sleep -Seconds 3
            }
            else {
                Write-Host $jsonStatus.status
                break
            }
        }
        while ($true)
    }
    else {
        # Display service reported error
        Write-Host $jsonResponse.message
    }
}
catch {
    # Display request error
    Write-Host $_.Exception
}

run.bat
@echo off

powershell -NoProfile -ExecutionPolicy Bypass -Command "& .\ConvertPdfToPngFromUrlAsynchronously.ps1"
echo Script finished with errorlevel=%errorlevel%

pause

PDF.co Web API: the Web API with a set of tools for documents manipulation, data conversion, data extraction, splitting and merging of documents. Includes image recognition, built-in OCR, barcode generation and barcode decoders to decode bar codes from scans, pictures and pdf.

Get your PDF.co API key here!

Download Source Code (.zip)

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