(C++) Get File Metadata

Gets a file's metadata or content by ID.

See Google Drive Files get for additional details.

Chilkat C/C++ Library Downloads
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#include <CkAuthGoogle.h>
#include <CkRest.h>
#include <CkStringBuilder.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.
    // A single REST object, once connected, can be used for many Google Drive REST API calls.
    // The auto-reconnect indicates that if the already-established HTTPS connection is closed,
    // then it will be automatically re-established as needed.
    bool bAutoReconnect = true;
    success = rest.Connect("www.googleapis.com",443,true,bAutoReconnect);

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

    // ------------------------------------------------------------------------------

    // We need to send a GET request like this:
    // GET https://www.googleapis.com/drive/v3/files/fileId
    // The fileId is part of the path.
    CkStringBuilder sbPath;
    sbPath.Append("/drive/v3/files/");
    // Assume we previously obtained the fileId for the file of interest...
    sbPath.Append("0B53Q6OSTWYolbUF6WS1Gei1oalk");

    // Indicate that we want ALL possible fields.
    // If no fields are indicated, then only the basic fields are returned.
    const char *allFields = "appProperties,capabilities,contentHints,createdTime,description,explicitlyTrashed,fileExtension,folderColorRgb,fullFileExtension,headRevisionId,iconLink,id,imageMediaMetadata,isAppAuthorized,kind,lastModifyingUser,md5Checksum,mimeType,modifiedByMeTime,modifiedTime,name,originalFilename,ownedByMe,owners,parents,permissions,properties,quotaBytesUsed,shared,sharedWithMeTime,sharingUser,size,spaces,starred,thumbnailLink,trashed,version,videoMediaMetadata,viewedByMe,viewedByMeTime,viewersCanCopyContent,webContentLink,webViewLink,writersCanShare";

    rest.AddQueryParam("fields",allFields);

    const char *jsonResponse = rest.fullRequestNoBody("GET",sbPath.getAsString());
    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;
    }

    // ---------------------------------------------------
    // Sample code for parsing this JSON is shown below...
    // ---------------------------------------------------

    // A successful response looks like this:
    // {
    //   "kind": "drive#file",
    //   "id": "0B53Q6OSTWYolbUF6WS1Gei1oalk",
    //   "name": "penguins.jpg",
    //   "mimeType": "image/jpeg",
    //   "starred": false,
    //   "trashed": false,
    //   "explicitlyTrashed": false,
    //   "parents": [
    //     "0B53Q6OSTWYola296ODZUSm5GYU0"
    //   ],
    //   "spaces": [
    //     "drive"
    //   ],
    //   "version": "672",
    //   "webContentLink": "https://docs.google.com/a/chilkatcloud.com/uc?id=0B53Q6OSTWYolbUF6WS1Gei1oalk&export=download",
    //   "webViewLink": "https://drive.google.com/a/chilkatcloud.com/file/d/0B53Q6OSTWYolbUF6WS1Gei1oalk/view?usp=drivesdk",
    //   "iconLink": "https://ssl.gstatic.com/docs/doclist/images/icon_11_image_list.png",
    //   "thumbnailLink": "https://lh5.googleusercontent.com/uIV1dJdc8vsAQzaaIInpc9AV55AcdHhpM7fQeI2RN2qbCSnhjK9IDdNQAOTtkvjS9ZObqw=s220",
    //   "viewedByMe": true,
    //   "viewedByMeTime": "2016-10-08T12:38:02.258Z",
    //   "createdTime": "2016-10-08T12:38:02.258Z",
    //   "modifiedTime": "2016-10-08T12:38:02.258Z",
    //   "modifiedByMeTime": "2016-10-08T12:38:02.258Z",
    //   "owners": [
    //     {
    //       "kind": "drive#user",
    //       "displayName": "Matthew Smith",
    //       "me": true,
    //       "permissionId": "08366696655122259092",
    //       "emailAddress": "support@chilkatcloud.com"
    //     }
    //   ],
    //   "lastModifyingUser": {
    //     "kind": "drive#user",
    //     "displayName": "Matthew Smith",
    //     "me": true,
    //     "permissionId": "08366696655122259092",
    //     "emailAddress": "support@chilkatcloud.com"
    //   },
    //   "shared": false,
    //   "ownedByMe": true,
    //   "capabilities": {
    //     "canEdit": true,
    //     "canComment": true,
    //     "canShare": true,
    //     "canCopy": true,
    //     "canReadRevisions": true
    //   },
    //   "viewersCanCopyContent": true,
    //   "writersCanShare": true,
    //   "permissions": [
    //     {
    //       "kind": "drive#permission",
    //       "id": "08366696655122259092",
    //       "type": "user",
    //       "emailAddress": "support@chilkatcloud.com",
    //       "role": "owner",
    //       "displayName": "Matthew Smith"
    //     }
    //   ],
    //   "originalFilename": "penguins.jpg",
    //   "fullFileExtension": "jpg",
    //   "fileExtension": "jpg",
    //   "md5Checksum": "9d377b10ce778c4938b3c7e2c63a229a",
    //   "size": "777835",
    //   "quotaBytesUsed": "777835",
    //   "headRevisionId": "0B53Q6OSTWYolUUlHVFhHdFlXQ0R1aHZuT0tORTVzc2h5NnZjPQ",
    //   "imageMediaMetadata": {
    //     "width": 1024,
    //     "height": 768,
    //     "rotation": 0,
    //     "time": "2009:03:12 13:48:35"
    //   },
    //   "isAppAuthorized": false
    // }

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

    // Show the full JSON response.
    json.put_EmitCompact(false);
    std::cout << json.emit() << "\r\n";
    std::cout << "-" << "\r\n";

    // Demonstrate how to get pieces of information:
    std::cout << "Original Filename: " << json.stringOf("originalFilename") << "\r\n";

    bool wasLastModifiedUserMe = json.BoolOf("lastModifyingUser.me");
    std::cout << "Was Last Modified by Me: " << wasLastModifiedUserMe << "\r\n";

    // Assuming this is an image file...
    int width = json.IntOf("imageMediaMetadata.width");
    std::cout << "Image Width: " << width << "\r\n";

    // Iterate over parents...
    int i;
    int numParents = json.SizeOfArray("parents");
    i = 0;
    while (i < numParents) {
        json.put_I(i);
        std::cout << "Parent " << i << ": " << json.stringOf("parents[i]") << "\r\n";
        i = i + 1;
    }

    // Iterate over owners...
    int numOwners = json.SizeOfArray("owners");
    i = 0;
    while (i < numOwners) {
        json.put_I(i);
        std::cout << "Owner " << i << ": kind=" << json.stringOf("owners[i].kind") << " displayName=" << json.stringOf("owners[i].displayName") << "\r\n";
        i = i + 1;
    }

    // Iterate over permissions...
    int numPermissions = json.SizeOfArray("permissions");
    i = 0;
    while (i < numPermissions) {
        json.put_I(i);
        std::cout << "Permission " << i << ": kind=" << json.stringOf("permissions[i].kind") << " id=" << json.stringOf("permissions[i].id") << "\r\n";
        i = i + 1;
    }
    }