Chilkat Online Tools

DetectSentiment VB6 Example

Amazon Comprehend

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

Dim rest As New ChilkatRest
Dim success As Long

Dim authAws As New ChilkatAuthAws
authAws.AccessKey = "AWS_ACCESS_KEY"
authAws.SecretKey = "AWS_SECRET_KEY"

' Don't forget to change the region to your particular region. (Also make the same change in the call to Connect below.)
authAws.Region = "us-west-2"
authAws.ServiceName = "comprehend"
' SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
success = rest.SetAuthAws(authAws)

' URL: https://comprehend.us-west-2.amazonaws.com/
' Use the same region as specified above.
success = rest.Connect("comprehend.us-west-2.amazonaws.com",443,1,1)
If (success <> 1) Then
    Debug.Print "ConnectFailReason: " & rest.ConnectFailReason
    Debug.Print rest.LastErrorText
    Exit Sub
End If

' The following code creates the JSON request body.
' The JSON created by this code is shown below.

' Use this online tool to generate code from sample JSON:
' Generate Code to Create JSON

Dim json As New ChilkatJsonObject
success = json.UpdateString("LanguageCode","string")
success = json.UpdateString("Text","string")

' The JSON request body created by the above code:

' {
'   "LanguageCode": "string",
'   "Text": "string"
' }

success = rest.AddHeader("Content-Type","application/x-amz-json-1.1")
success = rest.AddHeader("X-Amz-Target","Comprehend_20171127.DetectSentiment")

Dim sbRequestBody As New ChilkatStringBuilder
success = json.EmitSb(sbRequestBody)
Dim sbResponseBody As New ChilkatStringBuilder
success = rest.FullRequestSb("POST","/",sbRequestBody,sbResponseBody)
If (success <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

Dim respStatusCode As Long
respStatusCode = rest.ResponseStatusCode
Debug.Print "response status code = " & respStatusCode
If (respStatusCode <> 200) Then
    Debug.Print "Response Header:"
    Debug.Print rest.ResponseHeader
    Debug.Print "Response Body:"
    Debug.Print sbResponseBody.GetAsString()
    Exit Sub
End If

Dim jResp As New ChilkatJsonObject
success = jResp.LoadSb(sbResponseBody)

' The following code parses the JSON response.
' A sample JSON response is shown below the sample code.

' Use this online tool to generate parsing code from sample JSON:
' Generate Parsing Code from JSON

Dim Sentiment As String
Sentiment = jResp.StringOf("Sentiment")
Dim Mixed As Long
Mixed = jResp.IntOf("SentimentScore.Mixed")
Dim Negative As Long
Negative = jResp.IntOf("SentimentScore.Negative")
Dim Neutral As Long
Neutral = jResp.IntOf("SentimentScore.Neutral")
Dim Positive As Long
Positive = jResp.IntOf("SentimentScore.Positive")

' A sample JSON response body parsed by the above code:

' {
'   "Sentiment": "string",
'   "SentimentScore": {
'     "Mixed": number,
'     "Negative": number,
'     "Neutral": number,
'     "Positive": number
'   }
' }