クリップボードに保存してある画像をファイルに出力する。

Save-ImageFromClipboard.ps1

function Save-ImageFromClipboard
{
    
    [CmdletBinding()]
    param(
        [Parameter(ValueFromPipelineByPropertyName=$false, ValueFromPipeline=$false, Position=0, Mandatory=$false, HelpMessage="Path of image file that you want to save")]
        [String] $Path,

        [Parameter(ValueFromPipelineByPropertyName=$false, ValueFromPipeline=$false, Mandatory=$false, HelpMessage="Open default image viewer")]
        [Switch] $Invoke
    )

    # Generate path of image file
    if ($null -eq $Path) {
        $now = [DateTime]::Now.ToString("yyyyMMdd_HHMMss")
        $saveFileName = "{0}.jpg" -f $now
        $saveDir = Join-Path "${HOME}" "Pictures"
        $savePath = Join-Path $saveDir $saveFileName
    } else {
        $savePath = $Path
    }

    # Get clipboard image object
    Add-Type -AssemblyName System.Windows.Forms
    $img = [System.Windows.Forms.Clipboard]::GetImage()
    Write-Debug $img


    if ($null -eq $img) {
        Write-Error "Clipboard object is not image format or null. Please copy image and retry."
        return
    }

    # Save image
    try {
        $img.Save("$savePath")
        Write-Verbose "Saved image file: ${savePath}"
    } catch { throw }

    # If the switch is enabled, open the saved image in the default image viewer
    if ($null -ne $Invoke) { Invoke-Item $savePath }
}