Visual Basic 6.0 GMail: Lists the messages in the user's mailbox.

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Lists the messages in the user's mailbox.

Documentation: https://developers.google.com/gmail/api/v1/reference/users/messages/list

Dim rest As New ChilkatRest
Dim success As Long

'   Provide a previously obtained OAuth2 access token.
Dim oauth2 As New ChilkatOAuth2
oauth2.AccessToken = "OAUTH2_ACCESS_TOKEN"
success = rest.SetAuthOAuth2(oauth2)

success = rest.Connect("www.googleapis.com",443,1,1)
If (success <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

Dim sbJson As New ChilkatStringBuilder
success = rest.FullRequestNoBodySb("GET","/gmail/v1/users/me/messages",sbJson)
If (success <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

If (rest.ResponseStatusCode <> 200) Then
    Debug.Print "Received error response code: " & rest.ResponseStatusCode
    Debug.Print "Response body:"
    Debug.Print sbJson.GetAsString()
    Exit Sub
End If

Dim json As New ChilkatJsonObject
success = json.LoadSb(sbJson)

'  The following code parses the JSON response.
'  A sample JSON response is shown below the sample code.
Dim resultSizeEstimate As Long
Dim i As Long
Dim count_i As Long
Dim id As String
Dim threadId As String

resultSizeEstimate = json.IntOf("resultSizeEstimate")
i = 0
count_i = json.SizeOfArray("messages")
Do While i < count_i
    json.I = i
    id = json.StringOf("messages[i].id")
    threadId = json.StringOf("messages[i].threadId")
    i = i + 1
Loop

Debug.Print "Example Completed."

Sample JSON Response Body

{
  "messages": [
    {
      "id": "15fc237e79da4174",
      "threadId": "15fc237e79da4174"
    },
    {
      "id": "15fc23688c553739",
      "threadId": "15fc23688c553739"
    },
    {
      "id": "15fbd37d3a8f9950",
      "threadId": "15fbd37d3a8f9950"
    },
    {
      "id": "15fb5e49b822ac1d",
      "threadId": "15fb5e49b822ac1d"
    },
    {
      "id": "15fb5e49b7a0739b",
      "threadId": "15fb5e49b7a0739b"
    }
  ],
  "resultSizeEstimate": 5
}