(Visual FoxPro) Download File from Dropbox (Streaming)

See more Dropbox Examples

Downloads a file from Dropbox, streaming it directly to a file in the filesystem.

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

LOCAL loRest
LOCAL lnSuccess
LOCAL loJson
LOCAL loFileStream
LOCAL lnExpectedStatus
LOCAL lcResponseStr
LOCAL lcApiResult
LOCAL loJsonResult
LOCAL lnSize
LOCAL lcRev
LOCAL lcClientModified
LOCAL loCkdt
LOCAL lnBLocalTime
LOCAL loDt

* 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.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rest')
loRest = CreateObject('Chilkat.Rest')

* Connect to Dropbox
lnSuccess = loRest.Connect("content.dropboxapi.com",443,1,1)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    CANCEL
ENDIF

* Add request headers.
loRest.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": "/Homework/lit/hamlet.xml",
* }

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.AppendString("path","/Homework/lit/hamlet.xml")
loRest.AddHeader("Dropbox-API-Arg",loJson.Emit())

* Setup a file stream for the download
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Stream')
loFileStream = CreateObject('Chilkat.Stream')
loFileStream.SinkFile = "qa_output/hamletFromDropbox.xml"

* Indicate that the call to FullRequestNoBody should send the response body
* to fileStream if the response status code is 200.
* If a non-success response status code is received, then nothing
* is streamed to the output file and the error response is returned by FullRequestNoBody.
lnExpectedStatus = 200
loRest.SetResponseBodyStream(lnExpectedStatus,1,loFileStream)

lcResponseStr = loRest.FullRequestNoBody("POST","/2/files/download")
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loJson
    RELEASE loFileStream
    CANCEL
ENDIF

* When successful, Dropbox responds with a 200 response code.
IF (loRest.ResponseStatusCode <> 200) THEN
    * Examine the request/response to see what happened.
    ? "response status code = " + STR(loRest.ResponseStatusCode)
    ? "response status text = " + loRest.ResponseStatusText
    ? "response header: " + loRest.ResponseHeader
    ? "response body (if any): " + lcResponseStr
    ? "---"
    ? "LastRequestStartLine: " + loRest.LastRequestStartLine
    ? "LastRequestHeader: " + loRest.LastRequestHeader
    RELEASE loRest
    RELEASE loJson
    RELEASE loFileStream
    CANCEL
ENDIF

* 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:
lcApiResult = loRest.ResponseHdrByName("dropbox-api-result")
? lcApiResult

* In this case, the pretty-formatted dropbox-api-result JSON looks like this:
* { 
*   "name": "hamlet.xml",
*   "path_lower": "/homework/lit/hamlet.xml",
*   "path_display": "/Homework/lit/hamlet.xml",
*   "id": "id:74FkdeNuyKAAAAAAAAAAAQ",
*   "client_modified": "2016-06-02T23:19:00Z",
*   "server_modified": "2016-06-02T23:19:00Z",
*   "rev": "9482db15f",
*   "size": 279658
* }

* Load the JSON, pretty-print it, and demonstrate how to get some values...
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonResult = CreateObject('Chilkat.JsonObject')
loJsonResult.EmitCompact = 0
loJsonResult.Load(lcApiResult)
* Show the JSON pretty-printed...
? loJsonResult.Emit()

* Sample code to get data from the JSON response:
lnSize = loJsonResult.IntOf("size")
? "size = " + STR(lnSize)

lcRev = loJsonResult.StringOf("rev")
? "rev = " + lcRev

lcClientModified = loJsonResult.StringOf("client_modified")
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.CkDateTime')
loCkdt = CreateObject('Chilkat.CkDateTime')
loCkdt.SetFromTimestamp(lcClientModified)
lnBLocalTime = 1
loDt = loCkdt.GetDtObj(lnBLocalTime)
? STR(loDt.Day) + "/" + STR(loDt.Month) + "/" + STR(loDt.Year) + " " + STR(loDt.Hour) + ":" + STR(loDt.Minute)
RELEASE loDt

RELEASE loRest
RELEASE loJson
RELEASE loFileStream
RELEASE loJsonResult
RELEASE loCkdt