Script to use Google Image Search with local image as input

Question

I\'m looking for a batch or Powershell script to search for similar images on Google images using a local image as input.

Answer 1

function Get-GoogleImageSearchUrl
{
    param(
        [Parameter(Mandatory = $true)]
        [ValidateScript({ Test-Path $_ })]
        [string] $ImagePath
    )

    # extract the image file name, without path
    $fileName = Split-Path $imagePath -Leaf

    # the request body has some boilerplate before the raw image bytes (part1) and some after (part2)
    #   note that $filename is included in part1
    $part1 = @"
--7dd2db3297c2202
Content-Disposition: form-data; name="encoded_image"; filename="$fileName"
Content-Type: application/octet-stream`r`n`r`n
"@
    $part2 = @"
`r`n--7dd2db3297c2202--`r`n
"@

    # grab the raw bytes composing the image file
    $imageBytes = [Io.File]::ReadAllBytes($imagePath)

    # the request body should sandwich the image bytes between the 2 boilerplate blocks
    $encoding = New-Object Text.ASCIIEncoding
    $data = $encoding.GetBytes($part1) + $imageBytes + $encoding.GetBytes($part2)

    # create the HTTP request, populate headers
    $request = [Net.HttpWebRequest] ([Net.HttpWebRequest]::Create('http://images.google.com/searchbyimage/upload'))
    $request.Method = "POST"
    $request.ContentType = 'multipart/form-data; boundary=7dd2db3297c2202'  # must match the delimiter in the body, above

    # don't automatically redirect to the results page, just take the response which points to it
    $request.AllowAutoredirect = $false

    # populate the request body
    $stream = $request.GetRequestStream()
    $stream.Write($data, 0, $data.Length)
    $stream.Close()        

    # get response stream, which should contain a 302 redirect to the results page
    $respStream = $request.GetResponse().GetResponseStream()

    # pluck out the results page link that you would otherwise be redirected to
    (New-Object Io.StreamReader $respStream).ReadToEnd() -match 'HREF\="([^"]+)"' | Out-Null
    $matches[1]
}
$url = Get-GoogleImageSearchUrl 'C:\somepic.jpg'
Start-Process $url