(C++) 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.

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#include <CkAuthGoogle.h>
#include <CkRest.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    bool success = true;

    // 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.

    CkAuthGoogle gAuth;
    gAuth.put_AccessToken("GOOGLE-DRIVE-ACCESS-TOKEN");

    CkRest rest;

    // Connect using TLS.
    bool bAutoReconnect = true;
    success = rest.Connect("www.googleapis.com",443,true,bAutoReconnect);

    // Provide the authentication credentials (i.e. the access token)
    rest.SetAuthGoogle(gAuth);

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

    CkJsonObject json;
    int i;
    int numFiles;

    // Send the request for the 1st page.
    const char *jsonResponse = rest.fullRequestNoBody("GET","/drive/v3/files");

    int pageNumber = 1;
    const char *pageToken = 0;
    bool bContinueLoop = rest.get_LastMethodSuccess() && (rest.get_ResponseStatusCode() == 200);

    while (bContinueLoop == true) {

        std::cout << "---- Page " << pageNumber << " ----" << "\r\n";

        // Iterate over each file in the response and show the name, id, and mimeType.
        json.Load(jsonResponse);

        // See the sample JSON response at the bottom of this example.
        numFiles = json.SizeOfArray("files");
        i = 0;
        while (i < numFiles) {
            json.put_I(i);
            std::cout << "name: " << json.stringOf("files[i].name") << "\r\n";
            std::cout << "id: " << json.stringOf("files[i].id") << "\r\n";
            std::cout << "mimeType: " << json.stringOf("files[i].mimeType") << "\r\n";
            std::cout << "-" << "\r\n";
            i = i + 1;
        }

        // 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 = json.stringOf("nextPageToken");
        bContinueLoop = false;
        bool bHasMorePages = json.get_LastMethodSuccess();
        if (bHasMorePages == true) {
            rest.ClearAllQueryParams();
            rest.AddQueryParam("pageSize","5");
            rest.AddQueryParam("pageToken",pageToken);
            jsonResponse = rest.fullRequestNoBody("GET","/drive/v3/files");
            bContinueLoop = rest.get_LastMethodSuccess() && (rest.get_ResponseStatusCode() == 200);
            pageNumber = pageNumber + 1;
        }

    }

    if (rest.get_LastMethodSuccess() != true) {
        std::cout << rest.lastErrorText() << "\r\n";
        return;
    }

    // A successful response will have a status code equal to 200.
    if (rest.get_ResponseStatusCode() != 200) {
        std::cout << "response status code = " << rest.get_ResponseStatusCode() << "\r\n";
        std::cout << "response status text = " << rest.responseStatusText() << "\r\n";
        std::cout << "response header: " << rest.responseHeader() << "\r\n";
        std::cout << "response JSON: " << jsonResponse << "\r\n";
        return;
    }

    // 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"
    //    }
    //  ]
    // }
    }