DataFlex GMail: Get a specific message (format="minimal")

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Gets a specific message using format=minimal.

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

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoRest
    Boolean iSuccess
    Variant vOauth2
    Handle hoOauth2
    Variant vSbJson
    Handle hoSbJson
    Handle hoJson
    String sId
    String sThreadId
    String sSnippet
    String sHistoryId
    String sInternalDate
    Integer iSizeEstimate
    Integer i
    Integer iCount_i
    String sStrVal
    String sTemp1
    Integer iTemp1

    Get Create (RefClass(cComChilkatRest)) To hoRest
    If (Not(IsComObjectCreated(hoRest))) Begin
        Send CreateComObject of hoRest
    End

    //   Provide a previously obtained OAuth2 access token.
    Get Create (RefClass(cComChilkatOAuth2)) To hoOauth2
    If (Not(IsComObjectCreated(hoOauth2))) Begin
        Send CreateComObject of hoOauth2
    End
    Set ComAccessToken Of hoOauth2 To "OAUTH2_ACCESS_TOKEN"
    Get pvComObject of hoOauth2 to vOauth2
    Get ComSetAuthOAuth2 Of hoRest vOauth2 To iSuccess

    Get ComConnect Of hoRest "www.googleapis.com" 443 True True To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComAddPathParam Of hoRest "messageId" "15fc237e79da4174" To iSuccess

    Get ComAddQueryParam Of hoRest "format" "minimal" To iSuccess

    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbJson
    If (Not(IsComObjectCreated(hoSbJson))) Begin
        Send CreateComObject of hoSbJson
    End
    Get pvComObject of hoSbJson to vSbJson
    Get ComFullRequestNoBodySb Of hoRest "GET" "/gmail/v1/users/me/messages/messageId" vSbJson To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComResponseStatusCode Of hoRest To iTemp1
    If (iTemp1 <> 200) Begin
        Get ComResponseStatusCode Of hoRest To iTemp1
        Showln "Received error response code: " iTemp1
        Showln "Response body:"
        Get ComGetAsString Of hoSbJson To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get pvComObject of hoSbJson to vSbJson
    Get ComLoadSb Of hoJson vSbJson To iSuccess

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

    Get ComStringOf Of hoJson "id" To sId
    Get ComStringOf Of hoJson "threadId" To sThreadId
    Get ComStringOf Of hoJson "snippet" To sSnippet
    Get ComStringOf Of hoJson "historyId" To sHistoryId
    Get ComStringOf Of hoJson "internalDate" To sInternalDate
    Get ComIntOf Of hoJson "sizeEstimate" To iSizeEstimate
    Move 0 To i
    Get ComSizeOfArray Of hoJson "labelIds" To iCount_i
    While (i < iCount_i)
        Set ComI Of hoJson To i
        Get ComStringOf Of hoJson "labelIds[i]" To sStrVal
        Move i + 1 To i
    Loop

    Showln "Example Completed."


End_Procedure

Sample JSON Response Body

{
  "id": "15fc237e79da4174",
  "threadId": "15fc237e79da4174",
  "labelIds": [
    "IMPORTANT",
    "SENT",
    "INBOX"
  ],
  "snippet": "This is a test email with 2 attachments.",
  "historyId": "1582",
  "internalDate": "1510791964000",
  "sizeEstimate": 11153
}