(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 <C_CkAuthGoogle.h>
#include <C_CkRest.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkAuthGoogle gAuth;
    HCkRest rest;
    BOOL bAutoReconnect;
    HCkJsonObject json;
    int i;
    int numFiles;
    const char *jsonResponse;
    int pageNumber;
    const char *pageToken;
    BOOL bContinueLoop;
    BOOL bHasMorePages;

    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.

    gAuth = CkAuthGoogle_Create();
    CkAuthGoogle_putAccessToken(gAuth,"GOOGLE-DRIVE-ACCESS-TOKEN");

    rest = CkRest_Create();

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

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

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

    json = CkJsonObject_Create();

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

    pageNumber = 1;

    bContinueLoop = CkRest_getLastMethodSuccess(rest) && (CkRest_getResponseStatusCode(rest) == 200);

    while (bContinueLoop == TRUE) {

        printf("---- Page %d ----\n",pageNumber);

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

        // See the sample JSON response at the bottom of this example.
        numFiles = CkJsonObject_SizeOfArray(json,"files");
        i = 0;
        while (i < numFiles) {
            CkJsonObject_putI(json,i);
            printf("name: %s\n",CkJsonObject_stringOf(json,"files[i].name"));
            printf("id: %s\n",CkJsonObject_stringOf(json,"files[i].id"));
            printf("mimeType: %s\n",CkJsonObject_stringOf(json,"files[i].mimeType"));
            printf("-\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 = CkJsonObject_stringOf(json,"nextPageToken");
        bContinueLoop = FALSE;
        bHasMorePages = CkJsonObject_getLastMethodSuccess(json);
        if (bHasMorePages == TRUE) {
            CkRest_ClearAllQueryParams(rest);
            CkRest_AddQueryParam(rest,"pageSize","5");
            CkRest_AddQueryParam(rest,"pageToken",pageToken);
            jsonResponse = CkRest_fullRequestNoBody(rest,"GET","/drive/v3/files");
            bContinueLoop = CkRest_getLastMethodSuccess(rest) && (CkRest_getResponseStatusCode(rest) == 200);
            pageNumber = pageNumber + 1;
        }

    }

    if (CkRest_getLastMethodSuccess(rest) != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkAuthGoogle_Dispose(gAuth);
        CkRest_Dispose(rest);
        CkJsonObject_Dispose(json);
        return;
    }

    // A successful response will have a status code equal to 200.
    if (CkRest_getResponseStatusCode(rest) != 200) {
        printf("response status code = %d\n",CkRest_getResponseStatusCode(rest));
        printf("response status text = %s\n",CkRest_responseStatusText(rest));
        printf("response header: %s\n",CkRest_responseHeader(rest));
        printf("response JSON: %s\n",jsonResponse);
        CkAuthGoogle_Dispose(gAuth);
        CkRest_Dispose(rest);
        CkJsonObject_Dispose(json);
        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"
    //    }
    //  ]
    // }


    CkAuthGoogle_Dispose(gAuth);
    CkRest_Dispose(rest);
    CkJsonObject_Dispose(json);

    }