(PureBasic) 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 PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkAuthGoogle.pb"
IncludeFile "CkRest.pb"
IncludeFile "CkJsonObject.pb"

Procedure ChilkatExample()

    success.i = 1

    ; 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.

    gAuth.i = CkAuthGoogle::ckCreate()
    If gAuth.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkAuthGoogle::setCkAccessToken(gAuth, "GOOGLE-DRIVE-ACCESS-TOKEN")

    rest.i = CkRest::ckCreate()
    If rest.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Connect using TLS.
    bAutoReconnect.i = 1
    success = CkRest::ckConnect(rest,"www.googleapis.com",443,1,bAutoReconnect)

    ; Provide the authentication credentials (i.e. the access token)
    CkRest::ckSetAuthGoogle(rest,gAuth)

    ; Get 5 results per page for testing.  (The default page size is 100, with a max of 1000.
    CkRest::ckAddQueryParam(rest,"pageSize","5")

    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    i.i
    numFiles.i

    ; Send the request for the 1st page.
    jsonResponse.s = CkRest::ckFullRequestNoBody(rest,"GET","/drive/v3/files")

    pageNumber.i = 1
    pageToken.s
    bContinueLoop.i = CkRest::ckLastMethodSuccess(rest) AND (CkRest::ckResponseStatusCode(rest) = 200)

    While bContinueLoop = 1

        Debug "---- Page " + Str(pageNumber) + " ----"

        ; Iterate over each file in the response and show the name, id, and mimeType.
        CkJsonObject::ckLoad(json,jsonResponse)

        ; See the sample JSON response at the bottom of this example.
        numFiles = CkJsonObject::ckSizeOfArray(json,"files")
        i = 0
        While i < numFiles
            CkJsonObject::setCkI(json, i)
            Debug "name: " + CkJsonObject::ckStringOf(json,"files[i].name")
            Debug "id: " + CkJsonObject::ckStringOf(json,"files[i].id")
            Debug "mimeType: " + CkJsonObject::ckStringOf(json,"files[i].mimeType")
            Debug "-"
            i = i + 1
        Wend

        ; 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.
        pageToken = CkJsonObject::ckStringOf(json,"nextPageToken")
        bContinueLoop = 0
        bHasMorePages.i = CkJsonObject::ckLastMethodSuccess(json)
        If bHasMorePages = 1
            CkRest::ckClearAllQueryParams(rest)
            CkRest::ckAddQueryParam(rest,"pageSize","5")
            CkRest::ckAddQueryParam(rest,"pageToken",pageToken)
            jsonResponse = CkRest::ckFullRequestNoBody(rest,"GET","/drive/v3/files")
            bContinueLoop = CkRest::ckLastMethodSuccess(rest) AND (CkRest::ckResponseStatusCode(rest) = 200)
            pageNumber = pageNumber + 1
        EndIf

    Wend

    If CkRest::ckLastMethodSuccess(rest) <> 1
        Debug CkRest::ckLastErrorText(rest)
        CkAuthGoogle::ckDispose(gAuth)
        CkRest::ckDispose(rest)
        CkJsonObject::ckDispose(json)
        ProcedureReturn
    EndIf

    ; A successful response will have a status code equal to 200.
    If CkRest::ckResponseStatusCode(rest) <> 200
        Debug "response status code = " + Str(CkRest::ckResponseStatusCode(rest))
        Debug "response status text = " + CkRest::ckResponseStatusText(rest)
        Debug "response header: " + CkRest::ckResponseHeader(rest)
        Debug "response JSON: " + jsonResponse
        CkAuthGoogle::ckDispose(gAuth)
        CkRest::ckDispose(rest)
        CkJsonObject::ckDispose(json)
        ProcedureReturn
    EndIf

    ; 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"
    ;    }
    ;  ]
    ; }


    CkAuthGoogle::ckDispose(gAuth)
    CkRest::ckDispose(rest)
    CkJsonObject::ckDispose(json)


    ProcedureReturn
EndProcedure