(Visual FoxPro) Box.com Streaming Upload File

Demonstrates how to upload a file to box.com, streaming the file directly from the filesystem.

Note: This example requires a fix that is included in Chilkat v9.5.0.70 and above.

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

LOCAL loRest
LOCAL lnSuccess
LOCAL loOauth2
LOCAL lnBAutoReconnect
LOCAL loJsonAttr
LOCAL loFileStream
LOCAL lcResponseBody

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

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

*   Provide a previously obtained OAuth2 access token.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.OAuth2')
loOauth2 = CreateObject('Chilkat.OAuth2')
loOauth2.AccessToken = "BOX_ACCESS_TOKEN"
loRest.SetAuthOAuth2(loOauth2)

* First, make the initial connection.
* A single REST object, once connected, can be used for many Box REST API calls.
* The auto-reconnect indicates that if the already-established HTTPS connection is closed,
* then it will be automatically re-established as needed.
lnBAutoReconnect = 1

* ----------------------------------------------------------------------
* IMPORTANT: Note that the domain is "upload.box.com", not "api.box.com"
* ----------------------------------------------------------------------
lnSuccess = loRest.Connect("upload.box.com",443,1,lnBAutoReconnect)
IF (lnSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loOauth2
    CANCEL
ENDIF

* The request body uses the "multipart/form-data" format to transmit two "parts". 
* The first part is called "attributes" and contains a JSON object with information about the file, including the name of the file 
* and the ID of the parent folder. The second part contains the contents of the file. 
* (Note that the name of the second "part" is ignored.)

loRest.AddHeader("Content-Type","multipart/form-data")

* Provide the content for each part of the request...

* First the JSON attributes.  Use "0" for the root folder.
*   {"name":"hedgehogs.jpg", "parent":{"id":"0"}}
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonAttr = CreateObject('Chilkat.JsonObject')
loJsonAttr.UpdateString("name","hedgehogs.jpg")
loJsonAttr.UpdateString("parent.id","0")

loRest.PartSelector = "1"
loRest.AddHeader("Content-Disposition",'form-data; name="attributes"; ')
loRest.SetMultipartBodyString(loJsonAttr.Emit())

* The upload will stream directly from a file.
loRest.PartSelector = "2"
loRest.AddHeader("Content-Disposition",'form-data; name="file"; filename="hedgehogs.jpg"')
* "application/octet-stream" can be safely used for any type file..
loRest.AddHeader("Content-Type","application/octet-stream")

* IMPORTANT: This example requires Chilkat v9.5.0.70 or later, for a fix that was made in
* multipart/streaming uploads. 
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Stream')
loFileStream = CreateObject('Chilkat.Stream')
loFileStream.SourceFile = "qa_data/jpg/hedgehogs.jpg"
loRest.SetMultipartBodyStream(loFileStream)

* Restore the PartSelector to "0" (for safety, in case something else sends another request on this object)
loRest.PartSelector = "0"

* Send the multipart/form-data request, which uploads the file by streaming directly from the filesystem.
lcResponseBody = loRest.FullRequestMultipart("POST","/api/2.0/files/content")
IF (loRest.LastMethodSuccess <> 1) THEN
    ? loRest.LastErrorText
    RELEASE loRest
    RELEASE loOauth2
    RELEASE loJsonAttr
    RELEASE loFileStream
    CANCEL
ENDIF

* A 201 is received for a successful upload
IF (loRest.ResponseStatusCode <> 201) THEN
    ? "Box.com upload failed."
    ? "Request header:"
    ? loRest.LastRequestHeader
    ? "---"
    ? "Response status code = " + STR(loRest.ResponseStatusCode)
    ? "Response body:"
    ? lcResponseBody
    RELEASE loRest
    RELEASE loOauth2
    RELEASE loJsonAttr
    RELEASE loFileStream
    CANCEL
ENDIF

? "File uploaded."

RELEASE loRest
RELEASE loOauth2
RELEASE loJsonAttr
RELEASE loFileStream