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

void ChilkatSample(void)
    {
    BOOL success;
    HCkAuthGoogle gAuth;
    HCkRest rest;
    BOOL bAutoReconnect;
    HCkStringBuilder sbPath;
    const char *allFields;
    const char *jsonResponse;
    HCkJsonObject json;
    BOOL wasLastModifiedUserMe;
    int width;
    int i;
    int numParents;
    int numOwners;
    int numPermissions;

    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.
    // 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.
    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);

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

    // 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.
    sbPath = CkStringBuilder_Create();
    CkStringBuilder_Append(sbPath,"/drive/v3/files/");
    // Assume we previously obtained the fileId for the file of interest...
    CkStringBuilder_Append(sbPath,"0B53Q6OSTWYolbUF6WS1Gei1oalk");

    // Indicate that we want ALL possible fields.
    // If no fields are indicated, then only the basic fields are returned.
    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";

    CkRest_AddQueryParam(rest,"fields",allFields);

    jsonResponse = CkRest_fullRequestNoBody(rest,"GET",CkStringBuilder_getAsString(sbPath));
    if (CkRest_getLastMethodSuccess(rest) != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkAuthGoogle_Dispose(gAuth);
        CkRest_Dispose(rest);
        CkStringBuilder_Dispose(sbPath);
        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);
        CkStringBuilder_Dispose(sbPath);
        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.
    json = CkJsonObject_Create();
    CkJsonObject_Load(json,jsonResponse);

    // Show the full JSON response.
    CkJsonObject_putEmitCompact(json,FALSE);
    printf("%s\n",CkJsonObject_emit(json));
    printf("-\n");

    // Demonstrate how to get pieces of information:
    printf("Original Filename: %s\n",CkJsonObject_stringOf(json,"originalFilename"));

    wasLastModifiedUserMe = CkJsonObject_BoolOf(json,"lastModifyingUser.me");
    printf("Was Last Modified by Me: %d\n",wasLastModifiedUserMe);

    // Assuming this is an image file...
    width = CkJsonObject_IntOf(json,"imageMediaMetadata.width");
    printf("Image Width: %d\n",width);

    // Iterate over parents...

    numParents = CkJsonObject_SizeOfArray(json,"parents");
    i = 0;
    while (i < numParents) {
        CkJsonObject_putI(json,i);
        printf("Parent %d: %s\n",i,CkJsonObject_stringOf(json,"parents[i]"));
        i = i + 1;
    }

    // Iterate over owners...
    numOwners = CkJsonObject_SizeOfArray(json,"owners");
    i = 0;
    while (i < numOwners) {
        CkJsonObject_putI(json,i);
        printf("Owner %d: kind=%s displayName=%s\n",i,CkJsonObject_stringOf(json,"owners[i].kind"),CkJsonObject_stringOf(json,"owners[i].displayName"));
        i = i + 1;
    }

    // Iterate over permissions...
    numPermissions = CkJsonObject_SizeOfArray(json,"permissions");
    i = 0;
    while (i < numPermissions) {
        CkJsonObject_putI(json,i);
        printf("Permission %d: kind=%s id=%s\n",i,CkJsonObject_stringOf(json,"permissions[i].kind"),CkJsonObject_stringOf(json,"permissions[i].id"));
        i = i + 1;
    }



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

    }