(Xojo Plugin) Facebook Upload Photo from Local File

Uploads a new photo with a caption from a local file.

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

// This example assumes Chilkat HTTP to have been previously unlocked.
// See Global Unlock Sample for sample code.

Dim http As New Chilkat.Http

Dim req As New Chilkat.HttpRequest
req.HttpVerb = "POST"
req.ContentType = "multipart/form-data"
req.Path = "/v2.7/me/photos"

// Use the previously obtained access token.
// Note: The publish_actions scope is required to upload a photo.
req.AddHeader "Authorization","Bearer FACEBOOK-ACCESS-TOKEN"

// Send an "Expect: 100-continue" header in the request.
// This causes the HTTP server to end a 100-continue response
// immediately after receiving the HTTP header.  The client
// (Chilkat) will receive this intermediate response, and if
// it's not an error response, it knows that the HTTP server will
// accept the data that is forthcoming.
// The alternative is to get an error response after trying to upload
// the entire contents of the files.
req.AddHeader "Expect","100-continue"

// Set a photo caption.
req.AddParam "caption","Here are some penguins!"

// Additional parameters can be added to the request by 
// calling AddParam once per parameter.  
// See https://developers.facebook.com/docs/graph-api/reference/user/photos
// for more information about other optional parameters.

// Indicate the local file to be uploaded.
Dim success As Boolean
success = req.AddFileForUpload("source","qa_data/jpg/penguins2.jpg")
If (success <> True) Then
    System.DebugLog(req.LastErrorText)
    Return
End If

// Upload the image file..
Dim resp As Chilkat.HttpResponse
resp = http.SynchronousRequest("graph.facebook.com",443,True,req)
If (http.LastMethodSuccess <> True) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

// Examine the response body:
Dim responseJson As String
responseJson = resp.BodyStr
System.DebugLog(responseJson)

// The response contains JSON, such as this:
// {"id":"10210224963435862","post_id":"10224048320139890_10210224963435862"}