(Visual Basic 6.0) Download File from Dropbox into a String Variable

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

' 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.

Dim rest As New ChilkatRest

' Connect to Dropbox
Dim success As Long
success = rest.Connect("content.dropboxapi.com",443,1,1)
If (success <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

' Add request headers.
success = 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",
' }

Dim json As New ChilkatJsonObject
success = json.AppendString("path","/jack.txt")
success = rest.AddHeader("Dropbox-API-Arg",json.Emit())

' The content of the file on Dropbox is returned.
Dim fileContent As String
fileContent = rest.FullRequestNoBody("POST","/2/files/download")
If (rest.LastMethodSuccess <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

' When successful, Dropbox responds with a 200 response code.
If (rest.ResponseStatusCode <> 200) Then
    ' Examine the request/response to see what happened.
    Debug.Print "response status code = " & rest.ResponseStatusCode
    Debug.Print "response status text = " & rest.ResponseStatusText
    Debug.Print "response header: " & rest.ResponseHeader
    Debug.Print "response body (if any): " & fileContent
    Debug.Print "---"
    Debug.Print "LastRequestStartLine: " & rest.LastRequestStartLine
    Debug.Print "LastRequestHeader: " & rest.LastRequestHeader
    Exit Sub
End If

' Show the file content that was downloaded:
Debug.Print fileContent
Debug.Print "----"

' 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:
Dim apiResult As String
apiResult = rest.ResponseHdrByName("dropbox-api-result")
Debug.Print 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...
Dim jsonResult As New ChilkatJsonObject
jsonResult.EmitCompact = 0
success = jsonResult.Load(apiResult)
' Show the JSON pretty-printed...
Debug.Print jsonResult.Emit()

' Sample code to get data from the JSON response:
Dim size As Long
size = jsonResult.IntOf("size")
Debug.Print "size = " & size

Dim rev As String
rev = jsonResult.StringOf("rev")
Debug.Print "rev = " & rev

Dim clientModified As String
clientModified = jsonResult.StringOf("client_modified")
Dim ckdt As New CkDateTime
success = ckdt.SetFromTimestamp(clientModified)
Dim bLocalTime As Long
bLocalTime = 1
Dim dt As DtObj
Set dt = ckdt.GetDtObj(bLocalTime)
Debug.Print dt.Day & "/" & dt.Month & "/" & dt.Year & " " & dt.Hour & ":" & dt.Minute