(DataFlex) List all Pages of Files in Google Drive

Demonstrates how iterate over pages to list files in Google Drive.

See Google Drive Files list for more optional HTTP parameters.

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

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Variant vGAuth
    Handle hoGAuth
    Handle hoRest
    Boolean iBAutoReconnect
    Handle hoJson
    Integer i
    Integer iNumFiles
    String sJsonResponse
    Integer iPageNumber
    String sPageToken
    Boolean iBContinueLoop
    Boolean iBHasMorePages
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

    Move True To iSuccess

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

    // This example uses a previously obtained access token having permission for the 
    // Google Drive scope.

    Get Create (RefClass(cComChilkatAuthGoogle)) To hoGAuth
    If (Not(IsComObjectCreated(hoGAuth))) Begin
        Send CreateComObject of hoGAuth
    End
    Set ComAccessToken Of hoGAuth To "GOOGLE-DRIVE-ACCESS-TOKEN"

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

    // Connect using TLS.
    Move True To iBAutoReconnect
    Get ComConnect Of hoRest "www.googleapis.com" 443 True iBAutoReconnect To iSuccess

    // Provide the authentication credentials (i.e. the access token)
    Get pvComObject of hoGAuth to vGAuth
    Get ComSetAuthGoogle Of hoRest vGAuth To iSuccess

    // Get 5 results per page for testing.  (The default page size is 100, with a max of 1000.
    Get ComAddQueryParam Of hoRest "pageSize" "5" To iSuccess

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End

    // Send the request for the 1st page.
    Get ComFullRequestNoBody Of hoRest "GET" "/drive/v3/files" To sJsonResponse

    Move 1 To iPageNumber

    Get ComLastMethodSuccess Of hoRest To bTemp1
    Get ComResponseStatusCode Of hoRest To iTemp1
    Move (bTemp1 And (iTemp1 = 200)) To iBContinueLoop

    While (iBContinueLoop = True)

        Showln "---- Page " iPageNumber " ----"

        // Iterate over each file in the response and show the name, id, and mimeType.
        Get ComLoad Of hoJson sJsonResponse To iSuccess

        // See the sample JSON response at the bottom of this example.
        Get ComSizeOfArray Of hoJson "files" To iNumFiles
        Move 0 To i
        While (i < iNumFiles)
            Set ComI Of hoJson To i
            Get ComStringOf Of hoJson "files[i].name" To sTemp1
            Showln "name: " sTemp1
            Get ComStringOf Of hoJson "files[i].id" To sTemp1
            Showln "id: " sTemp1
            Get ComStringOf Of hoJson "files[i].mimeType" To sTemp1
            Showln "mimeType: " sTemp1
            Showln "-"
            Move (i + 1) To i
        Loop

        // Get the next page of files.
        // If the "nextPageToken" is present in the JSON response, then use it in the "pageToken" parameter
        // for the next request.   If no "nextPageToken" was present, then this was the last page of files.
        Get ComStringOf Of hoJson "nextPageToken" To sPageToken
        Move False To iBContinueLoop
        Get ComLastMethodSuccess Of hoJson To iBHasMorePages
        If (iBHasMorePages = True) Begin
            Get ComClearAllQueryParams Of hoRest To iSuccess
            Get ComAddQueryParam Of hoRest "pageSize" "5" To iSuccess
            Get ComAddQueryParam Of hoRest "pageToken" sPageToken To iSuccess
            Get ComFullRequestNoBody Of hoRest "GET" "/drive/v3/files" To sJsonResponse
            Get ComLastMethodSuccess Of hoRest To bTemp1
            Get ComResponseStatusCode Of hoRest To iTemp1
            Move (bTemp1 And (iTemp1 = 200)) To iBContinueLoop
            Move (iPageNumber + 1) To iPageNumber
        End

    Loop

    Get ComLastMethodSuccess Of hoRest To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // A successful response will have a status code equal to 200.
    Get ComResponseStatusCode Of hoRest To iTemp1
    If (iTemp1 <> 200) Begin
        Get ComResponseStatusCode Of hoRest To iTemp1
        Showln "response status code = " iTemp1
        Get ComResponseStatusText Of hoRest To sTemp1
        Showln "response status text = " sTemp1
        Get ComResponseHeader Of hoRest To sTemp1
        Showln "response header: " sTemp1
        Showln "response JSON: " sJsonResponse
        Procedure_Return
    End

    // A successful JSON response looks like this:
    // {
    //  "kind": "drive#fileList",
    //  "files": [
    //    {
    //      "kind": "drive#file",
    //      "id": "0B53Q6OSTWYolenpjTEU4ekJlQUU",
    //      "name": "test",
    //      "mimeType": "application/vnd.google-apps.folder"
    //    },
    //    {
    //      "kind": "drive#file",
    //      "id": "0B53Q6OSTWYolRm4ycjZtdXhRaEE",
    //      "name": "starfish4.jpg",
    //      "mimeType": "image/jpeg"
    //    },
    //    {
    //      "kind": "drive#file",
    //      "id": "0B53Q6OSTWYolMWt2VzN0Qlo1UjA",
    //      "name": "hamlet2.xml",
    //      "mimeType": "text/xml"
    //    },
    // ...
    //    {
    //      "kind": "drive#file",
    //      "id": "0B53Q6OSTWYolc3RhcnRlcl9maWxlX2Rhc2hlclYw",
    //      "name": "Getting started",
    //      "mimeType": "application/pdf"
    //    }
    //  ]
    // }


End_Procedure