(DataFlex) Get a List of Message IDs in GMail User's Mailbox

Demonstrates how to get a list of message IDs in a GMail mailbox. The "userId" can be either the user's email address or the special value "me" to indicate the authenticated user.

For more information, see https://developers.google.com/gmail/api/v1/reference/users/messages/list

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

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoHttp
    Variant vResp
    Handle hoResp
    Handle hoJsonResponse
    Boolean iSuccess
    String sId
    String sThreadId
    Integer iResultSizeEstimate
    Integer i
    Integer iCount_i
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

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

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    Set ComAuthToken Of hoHttp To "ACCESS_TOKEN"

    Set ComAccept Of hoHttp To "application/json"

    Get ComQuickRequest Of hoHttp "GET" "https://www.googleapis.com/gmail/v1/users/userId/messages" To vResp
    If (IsComObject(vResp)) Begin
        Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
        Set pvComObject Of hoResp To vResp
    End
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComStatusCode Of hoResp To iTemp1
    Showln "Response Status Code: " iTemp1

    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonResponse
    If (Not(IsComObjectCreated(hoJsonResponse))) Begin
        Send CreateComObject of hoJsonResponse
    End
    Get ComBodyStr Of hoResp To sTemp1
    Get ComLoad Of hoJsonResponse sTemp1 To iSuccess
    Set ComEmitCompact Of hoJsonResponse To False
    Get ComEmit Of hoJsonResponse To sTemp1
    Showln sTemp1

    Get ComStatusCode Of hoResp To iTemp1
    If (iTemp1 <> 200) Begin
        Showln "Failed."
        Send Destroy of hoResp
        Procedure_Return
    End

    Send Destroy of hoResp

    // {
    //   "messages": [
    //     users.messages Resource
    //   ],
    //   "nextPageToken": string,
    //   "resultSizeEstimate": unsigned integer
    // }

    Get ComIntOf Of hoJsonResponse "resultSizeEstimate" To iResultSizeEstimate
    Move 0 To i
    Get ComSizeOfArray Of hoJsonResponse "messages" To iCount_i
    While (i < iCount_i)
        Set ComI Of hoJsonResponse To i
        Get ComStringOf Of hoJsonResponse "messages[i].id" To sId
        Get ComStringOf Of hoJsonResponse "messages[i].threadId" To sThreadId
        Move (i + 1) To i
    Loop



End_Procedure