从Google云端硬盘列出所有文件夹内容 [英] Listing All Folder content from Google Drive
本文介绍了从Google云端硬盘列出所有文件夹内容的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
您好，我已经使用博士从谷歌驱动器编辑示例代码将Google Dive与我的应用程序集成在一起。但我无法查看存储在我的Google云端硬盘帐户中的所有文件。
//我试过了这个
- （void）getFileListFromSpecifiedParentFolder
{
GTLQueryDrive * query2 = [GTLQueryDrive queryForChildrenListWithFolderId：@root];
query2.maxResults = 1000;
[self.driveService executeQuery：query2
completionHandler：^（GTLServiceTicket * ticket，
GTLDriveChildList * children，NSError * error）
{
NSLog（@\\\
Google Drive：文件夹中的文件数量：％d，children.items.count）;
if（！children.items.count）
{
return;
if（error == nil）
{
for（GTLDriveChildReference * child in children）
{
GTLQuery * query = [GTLQueryDrive queryForFilesGetWithFileId：child.identifier];
[self.driveService executeQuery：query completionHandler：^（GTLServiceTicket * ticket，
GTLDriveFile * file，
NSError * error）
{
NSLog（@\ nfile name =％@，file.originalFilename）;}];
}
}
}];
//我想在NSLog中显示所有内容...
解决方案
1。如何从Google Drive获取所有文件
首先在 viewDidLoad：方法检查用于身份验证
- （void）viewDidLoad
{
[self checkForAuthorization];
}
以下是所有方法的定义：
//此方法将检查用户身份验证
//如果他没有登录，那么它将会处于其他状态，并将显示登录viewController
- （void）checkForAuthorization
{
//检查授权。
GTMOAuth2Authentication * auth =
[GTMOAuth2ViewControllerTouch authForGoogleFromKeychainForName：kKeychainItemName
clientID：kClientId
clientSecret：kClientSecret];
if（[auth canAuthorize]）
{
[self isAuthorizedWithAuthentication：auth];
}
else
{
SEL finishedSelector = @selector（viewController：finishedWithAuth：error :);
GTMOAuth2ViewControllerTouch * authViewController =
[[GTMOAuth2ViewControllerTouch alloc] initWithScope：kGTLAuthScopeDrive
clientID：kClientId
clientSecret：kClientSecret
keychainItemName：kKeychainItemName
delegate：self
finishedSelector：finishedSelector];
[self presentViewController：authViewController animated：YES completion：nil];
//这个方法将在登录后调用
- （void）viewController：（GTMOAuth2ViewControllerTouch *）viewController finishedWithAuth：（GTMOAuth2Authentication *）auth错误：（NSError *）错误
{
[self dismissViewControllerAnimated：YES completion：nil];
if（error == nil）
{
[self isAuthorizedWithAuthentication：auth];
//如果everthing没有问题，那么使用auth
初始化driveServices（void）isAuthorizedWithAuthentication：（GTMOAuth2Authentication *）auth
{
[[self driveService] setAuthorizer：auth];
//最后在这里你可以加载所有文件
[self loadDriveFiles];
- （GTLServiceDrive *）driveService
{
static GTLServiceDrive * service = nil;
if（！service）
{
service = [[GTLServiceDrive alloc] init];
//让服务对象设置票据以获取提要的连续页面
//，因此我们不需要手动提取它们。
service.shouldFetchNextPages = YES;
//让服务对象设置票据以自动重试临时错误条件
//。
service.retryEnabled = YES;
}
退货服务;
}
//从Google Drive加载所有文件的方法
- （void）loadDriveFiles
{
GTLQueryDrive * query = [GTLQueryDrive queryForFilesList];
query.q = [NSString stringWithFormat：@'％@'IN parents，@root];
// root用于根文件夹将其替换为文件夹标识符以便获取任何特定文件夹
[self.driveService executeQuery：query completionHandler：^（GTLServiceTicket * ticket，
GTLDriveFileList *文件，
NSError *错误）{
if（error == nil）
{
driveFiles = [[NSMutableArray alloc] init];
[driveFiles addObjectsFromArray：files.items];
//现在你有根文件夹
的所有文件（驱动文件中的GTLDriveFile *文件）
NSLog（@File is％@，file.title）;
}
else
{
NSLog（@An error occurred：％@，error）;
}
}];
注意：应该是 kGTLAuthScopeDrive 。
[[GTMOAuth2ViewControllerTouch alloc] initWithScope：kGTLAuthScopeDrive
clientID：kClientId
clientSecret：kClientSecret
keychainItemName：kKeychainItemName
delegate：self
finishedSelector：finishedSelector];
2。如何下载特定文件
因此，您必须使用 GTMHTTPFetcher 。首先获取该文件的下载URL。
NSString * downloadedString = file.downloadUrl; //文件是GTLDriveFile
GTMHTTPFetcher * fetcher = [self.driveService.fetcherService fetcherWithURLString：downloadedString];
[fetcher beginFetchWithCompletionHandler：^（NSData * data，NSError * error）
{
if（error == nil）
{
if（data！= nil） {
//你已经成功下载了这个文件，它的名字是
// NSString * name = file.title;
{
NSLog（@Error - ％@，error.description）
}
}];
注意：如果发现downloadedStringnull或者空只是看一下file.JSON有exportsLinks数组，那么你可以用它们中的一个来获取文件。
3。如何上传特定文件夹中的文件：这是一个上传图片的例子。
- （void）uploadImage ：（UIImage *）image
{
//我们需要数据将其上传，以便将其转换为数据
//如果您从任何路径获取文件，则使用dataWithContentsOfFile：方法
NSData * data = UIImagePNGRepresentation（image）;
//定义mimeType
NSString * mimeType = @image / png;
//这只是因为你可以给它任意的名字
NSDateFormatter * df = [[NSDateFormatter alloc] init];
[df setDateFormat：@dd-MMM-yyyy -hh-mm-ss];
NSString * fileName = [df stringFromDate：[NSDate date]];
fileName = [fileName stringByAppendingPathExtension：@png];
//像这样初始化newFile
GTLDriveFile * newFile = [[GTLDriveFile alloc] init];
newFile.mimeType = mimeType;
newFile.originalFilename = fileName;
newFile.title = fileName;
//查询和上传参数
GTLUploadParameters * uploadParameters = [GTLUploadParameters uploadParametersWithData：data MIMEType：mimeType];
GTLQueryDrive * query = [GTLQueryDrive queryForFilesInsertWithObject：newFile uploadParameters：uploadParameters];
//这是为了上传到特定的文件夹，我为根文件夹设置了root。
//你可以给该文件夹上传任何folderIdentifier
GTLDriveParentReference * parentReference = [GTLDriveParentReference object];
parentReference.identifier = @root;
newFile.parents = @ [parentReference];
//最后这是上传文件的方法
[[self driveService] executeQuery：query completionHandler：^（GTLServiceTicket * ticket，id object，NSError * error）{
if（error）{
NSLog（@Error：％@，error.description）;
}
else {
NSLog（@文件已成功上传到根文件夹中。）;
}
}];
}
Hi I have integrated google Dive with my app using Dr. Edit sample code from google drive. But i am not able to view all the files, which are stored in my Google Drive account.
// I have tried this
-(void)getFileListFromSpecifiedParentFolder
{
GTLQueryDrive *query2 = [GTLQueryDrive queryForChildrenListWithFolderId:@"root"];
query2.maxResults = 1000;
[self.driveService executeQuery:query2
completionHandler:^(GTLServiceTicket *ticket,
GTLDriveChildList *children, NSError *error)
{
NSLog(@"\nGoogle Drive: file count in the folder: %d", children.items.count);
if (!children.items.count)
{
return ;
}
if (error == nil)
{
for (GTLDriveChildReference *child in children)
{
GTLQuery *query = [GTLQueryDrive queryForFilesGetWithFileId:child.identifier];
[self.driveService executeQuery:query completionHandler:^(GTLServiceTicket *ticket,
GTLDriveFile *file,
NSError *error)
{
NSLog(@"\nfile name = %@", file.originalFilename);}];
}
}
}];
}
//I want to Display All content in NSLog...
解决方案
1. How to get all files from Google Drive.
First in viewDidLoad: method check for authentication
-(void)viewDidLoad
{
[self checkForAuthorization];
}
And here is the definition of all methods:
// This method will check the user authentication
// If he is not logged in then it will go in else condition and will present a login viewController
-(void)checkForAuthorization
{
// Check for authorization.
GTMOAuth2Authentication *auth =
[GTMOAuth2ViewControllerTouch authForGoogleFromKeychainForName:kKeychainItemName
clientID:kClientId
clientSecret:kClientSecret];
if ([auth canAuthorize])
{
[self isAuthorizedWithAuthentication:auth];
}
else
{
SEL finishedSelector = @selector(viewController:finishedWithAuth:error:);
GTMOAuth2ViewControllerTouch *authViewController =
[[GTMOAuth2ViewControllerTouch alloc] initWithScope:kGTLAuthScopeDrive
clientID:kClientId
clientSecret:kClientSecret
keychainItemName:kKeychainItemName
delegate:self
finishedSelector:finishedSelector];
[self presentViewController:authViewController animated:YES completion:nil];
}
}
// This method will be call after logged in
- (void)viewController:(GTMOAuth2ViewControllerTouch *)viewController finishedWithAuth: (GTMOAuth2Authentication *)auth error:(NSError *)error
{
[self dismissViewControllerAnimated:YES completion:nil];
if (error == nil)
{
[self isAuthorizedWithAuthentication:auth];
}
}
// If everthing is fine then initialize driveServices with auth
- (void)isAuthorizedWithAuthentication:(GTMOAuth2Authentication *)auth
{
[[self driveService] setAuthorizer:auth];
// and finally here you can load all files
[self loadDriveFiles];
}
- (GTLServiceDrive *)driveService
{
static GTLServiceDrive *service = nil;
if (!service)
{
service = [[GTLServiceDrive alloc] init];
// Have the service object set tickets to fetch consecutive pages
// of the feed so we do not need to manually fetch them.
service.shouldFetchNextPages = YES;
// Have the service object set tickets to retry temporary error conditions
// automatically.
service.retryEnabled = YES;
}
return service;
}
// Method for loading all files from Google Drive
-(void)loadDriveFiles
{
GTLQueryDrive *query = [GTLQueryDrive queryForFilesList];
query.q = [NSString stringWithFormat:@"'%@' IN parents", @"root"];
// root is for root folder replace it with folder identifier in case to fetch any specific folder
[self.driveService executeQuery:query completionHandler:^(GTLServiceTicket *ticket,
GTLDriveFileList *files,
NSError *error) {
if (error == nil)
{
driveFiles = [[NSMutableArray alloc] init];
[driveFiles addObjectsFromArray:files.items];
// Now you have all files of root folder
for (GTLDriveFile *file in driveFiles)
NSLog(@"File is %@", file.title);
}
else
{
NSLog(@"An error occurred: %@", error);
}
}];
}
Note: For get full drive access your scope should be kGTLAuthScopeDrive.
[[GTMOAuth2ViewControllerTouch alloc] initWithScope:kGTLAuthScopeDrive
clientID:kClientId
clientSecret:kClientSecret
keychainItemName:kKeychainItemName
delegate:self
finishedSelector:finishedSelector];
2. How to download a specific file.
So for this you will have to use GTMHTTPFetcher. First get the download URL for that file.
NSString *downloadedString = file.downloadUrl; // file is GTLDriveFile
GTMHTTPFetcher *fetcher = [self.driveService.fetcherService fetcherWithURLString:downloadedString];
[fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error)
{
if (error == nil)
{
if(data != nil){
// You have successfully downloaded the file write it with its name
// NSString *name = file.title;
}
}
else
{
NSLog(@"Error - %@", error.description)
}
}];
Note: If you found "downloadedString" null Or empty just have look at file.JSON there are array of "exportsLinks" then you can get the file with one of them.
3. How to upload a file in specific folder: This is an example of uploading image.
-(void)uploadImage:(UIImage *)image
{
// We need data to upload it so convert it into data
// If you are getting your file from any path then use "dataWithContentsOfFile:" method
NSData *data = UIImagePNGRepresentation(image);
// define the mimeType
NSString *mimeType = @"image/png";
// This is just because of unique name you can give it whatever you want
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"dd-MMM-yyyy-hh-mm-ss"];
NSString *fileName = [df stringFromDate:[NSDate date]];
fileName = [fileName stringByAppendingPathExtension:@"png"];
// Initialize newFile like this
GTLDriveFile *newFile = [[GTLDriveFile alloc] init];
newFile.mimeType = mimeType;
newFile.originalFilename = fileName;
newFile.title = fileName;
// Query and UploadParameters
GTLUploadParameters *uploadParameters = [GTLUploadParameters uploadParametersWithData:data MIMEType:mimeType];
GTLQueryDrive *query = [GTLQueryDrive queryForFilesInsertWithObject:newFile uploadParameters:uploadParameters];
// This is for uploading into specific folder, I set it "root" for root folder.
// You can give any "folderIdentifier" to upload in that folder
GTLDriveParentReference *parentReference = [GTLDriveParentReference object];
parentReference.identifier = @"root";
newFile.parents = @[parentReference];
// And at last this is the method to upload the file
[[self driveService] executeQuery:query completionHandler:^(GTLServiceTicket *ticket, id object, NSError *error) {
if (error){
NSLog(@"Error: %@", error.description);
}
else{
NSLog(@"File has been uploaded successfully in root folder.");
}
}];
}
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