(PowerShell) Download File from Dropbox into a String Variable

Demonstrates how to download a file from Dropbox directly into a string variable.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# A Dropbox access token should have been previously obtained.
# Dropbox access tokens do not expire.
# See Dropbox Access Token.

$rest = New-Object Chilkat.Rest

# Connect to Dropbox
$success = $rest.Connect("content.dropboxapi.com",443,$true,$true)
if ($success -ne $true) {
    $($rest.LastErrorText)
    exit
}

# Add request headers.
$rest.AddHeader("Authorization","Bearer DROPBOX_ACCESS_TOKEN")

# The download "parameters" are contained in JSON passed in an HTTP request header.
# This is the JSON indicating the file to be downloaded:
# { 
#    "path": "/jack.txt",
# }

$json = New-Object Chilkat.JsonObject
$json.AppendString("path","/jack.txt")
$rest.AddHeader("Dropbox-API-Arg",$json.Emit())

# The content of the file on Dropbox is returned.
$fileContent = $rest.FullRequestNoBody("POST","/2/files/download")
if ($rest.LastMethodSuccess -ne $true) {
    $($rest.LastErrorText)
    exit
}

# When successful, Dropbox responds with a 200 response code.
if ($rest.ResponseStatusCode -ne 200) {
    # Examine the request/response to see what happened.
    $("response status code = " + $rest.ResponseStatusCode)
    $("response status text = " + $rest.ResponseStatusText)
    $("response header: " + $rest.ResponseHeader)
    $("response body (if any): " + $fileContent)
    $("---")
    $("LastRequestStartLine: " + $rest.LastRequestStartLine)
    $("LastRequestHeader: " + $rest.LastRequestHeader)
    exit
}

# Show the file content that was downloaded:
$($fileContent)
$("----")

# Information about the downloaded file is also available as JSON in a response header.
# The "dropbox-api-result" response header contains the information.  For example:
$apiResult = $rest.ResponseHdrByName("dropbox-api-result")
$($apiResult)

# In this case, the pretty-formatted dropbox-api-result JSON looks like this:
# { 
#   "name": "jack.txt",
#   "path_lower": "/jack.txt",
#   "path_display": "/jack.txt",
#   "id": "id:yqx4-tE_NKAAAAAAAAAAAQ",
#   "client_modified": "2016-06-02T20:42:11Z",
#   "server_modified": "2016-06-02T20:42:11Z",
#   "rev": "8482db15f",
#   "size": 42
# }

# Load the JSON, pretty-print it, and demonstrate how to get some values...
$jsonResult = New-Object Chilkat.JsonObject
$jsonResult.EmitCompact = $false
$jsonResult.Load($apiResult)
# Show the JSON pretty-printed...
$($jsonResult.Emit())

# Sample code to get data from the JSON response:
$size = $jsonResult.IntOf("size")
$("size = " + $size)

$rev = $jsonResult.StringOf("rev")
$("rev = " + $rev)

$clientModified = $jsonResult.StringOf("client_modified")
$ckdt = New-Object Chilkat.CkDateTime
$ckdt.SetFromTimestamp($clientModified)
$bLocalTime = $true
$dt = $ckdt.GetDtObj($bLocalTime)
$([string]$dt.Day + "/" + $dt.Month + "/" + $dt.Year + " " + $dt.Hour + ":" + $dt.Minute)