(Visual FoxPro) Upload Media to Twitter

Demonstrates uploading image or video files to Twitter. After uploading, the media_id can be used to attach the uploaded media to a tweet.

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

LOCAL loJsonToken
LOCAL lnSuccess
LOCAL loHttp
LOCAL loReq
LOCAL loFac
LOCAL loJpgBytes
LOCAL loResp
LOCAL loJsonResponse

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

* Assume we've previously obtained an access token and saved it to a JSON file..
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonToken = CreateObject('Chilkat.JsonObject')
lnSuccess = loJsonToken.LoadFile("qa_data/tokens/twitter.json")

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

* Provide the OAuth 1.0a credentials:
loHttp.OAuth1 = 1
loHttp.OAuthConsumerKey = "TWITTER_CONSUMER_KEY"
loHttp.OAuthConsumerSecret = "TWITTER_CONSUMER_SECRET"
loHttp.OAuthToken = loJsonToken.StringOf("oauth_token")
loHttp.OAuthTokenSecret = loJsonToken.StringOf("oauth_token_secret")

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.HttpRequest')
loReq = CreateObject('Chilkat.HttpRequest')
loReq.HttpVerb = "POST"
loReq.ContentType = "multipart/form-data"
loReq.Path = "/1.1/media/upload.json"

loReq.AddHeader("Expect","100-continue")

* Add a JPEG image file to the upload.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.FileAccess')
loFac = CreateObject('Chilkat.FileAccess')

loJpgBytes = loFac.ReadEntireFile("qa_data/jpg/starfish.jpg")
loReq.AddBytesForUpload("media","starfish.jpg",loJpgBytes)

loResp = loHttp.SynchronousRequest("upload.twitter.com",443,1,loReq)
IF (loHttp.LastMethodSuccess <> 1) THEN
    ? loHttp.LastErrorText
    RELEASE loJsonToken
    RELEASE loHttp
    RELEASE loReq
    RELEASE loFac
    CANCEL
ENDIF

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJsonResponse = CreateObject('Chilkat.JsonObject')
loJsonResponse.EmitCompact = 0
loJsonResponse.Load(loResp.BodyStr)

IF (loResp.StatusCode <> 200) THEN
    ? loJsonResponse.Emit()
    RELEASE loJsonToken
    RELEASE loHttp
    RELEASE loReq
    RELEASE loFac
    RELEASE loJsonResponse
    CANCEL
ENDIF

RELEASE loResp

* Show the successful response:
? loJsonResponse.Emit()
? "Success."

* A successful JSON response looks like this:

* 	{
* 	  "media_id": 793137045996646400,
* 	  "media_id_string": "793137045996646400",
* 	  "size": 6229,
* 	  "expires_after_secs": 86400,
* 	  "image": {
* 	    "image_type": "image\/jpeg",
* 	    "w": 120,
* 	    "h": 120
* 	  }
* 	}
* 

* Get the information from the JSON:
? "media_id_string = " + loJsonResponse.StringOf("media_id_string")
? "size = " + STR(loJsonResponse.IntOf("size"))
? "image_type = " + loJsonResponse.StringOf("image.image_type")
? "height/width = " + STR(loJsonResponse.IntOf("image.w")) + "," + STR(loJsonResponse.IntOf("image.h"))

RELEASE loJsonToken
RELEASE loHttp
RELEASE loReq
RELEASE loFac
RELEASE loJsonResponse