Question

我试图从3天开始从google drive API下载文件但没有成功。我使用了https://developers.google.com/drive/ios/devguide/files#reading_files。

但我无法理解我需要放入* drive和* file？

我试过了：
GTLDriveFile *file = @"fileText.txt";（或者我在谷歌驱动器上尝试了我的文件的网址...）该指南没有解释......我没有找到真实的例子。

GTLServiceDrive *drive = ...;
GTLDriveFile *file = ...;
NSString *url = [NSString stringWithFormat:@"https://www.googleapis.com/drive/v3/files/%@?alt=media",
                          file.identifier]
GTMSessionFetcher *fetcher = [drive.fetcherService fetcherWithURLString:url];

[fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error) {
  if (error == nil) {
    NSLog(@"Retrieved file content");
    // Do something with data
  } else {
    NSLog(@"An error occurred: %@", error);
  }
}];

所以我搜索了其他代码，但没有人解释我需要放入驱动器和文件中的内容：

how to download file from google drive using objective c?（只是这说它是网址）
Google drive api download file for iOS
IOS: How to Download Google Docs files using ios google drive sdk API?

解决方案：

我的示波器存在授权问题，通过对驱动器的完全访问权限解决了问题。我改变了范围（在快速入门代码中，看看：“ - （GTMOAuth2ViewControllerTouch *）createAuthController ......”） - ＆GT; NSArray *scopes = [NSArray arrayWithObjects:kGTLAuthScopeDrive, nil];

下载（受quickstart示例启发）：

// self.service is my GTLServiceDrive

    // When the view appears, ensure that the Drive API service is authorized, and perform API calls.
    - (void)viewDidAppear:(BOOL)animated {
        if (!self.service.authorizer.canAuthorize) {
            // Not yet authorized, request authorization by pushing the login UI onto the UI stack.
            [self presentViewController:[self createAuthController] animated:YES completion:nil];

        } else {
            NSString *urltest = [NSString stringWithFormat:@"https://www.googleapis.com/drive/v3/files/%@?alt=media", identifier_file]; //the ID of my file in a string identifier_file

    GTMSessionFetcher *fetcher = [self.service.fetcherService fetcherWithURLString:urltest];  // the request 

            // receive response and play it in web view:
            [fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *errorrr) {
                if (errorrr == nil) {
                    NSLog(@"Retrieved file content");

                    [webView_screen loadData:data MIMEType:@"application/pdf" textEncodingName:@"UTF-8" baseURL:nil]; //my file is a pdf
                    [webView_screen reload];

                } else {
                    NSLog(@"An error occurred: %@", errorrr);
                }
            }];

如果您想保存在手机上，可以查看Bala的代码。

Answer 1

首先从云端硬盘

获取文件

driveFiles = [[NSMutableArray alloc] init];

         for (GTLDriveFile *file in files.items) {

             if ([file.mimeType isEqualToString:@"application/vnd.google-apps.folder"])
             {

             }
             else
             {
                 NSString *fileExtension=file.fileExtension;

                 if (fileExtension)
                 {
                     if([fileExtension isEqualToString:@"pdf"])
                     {
                         [driveFiles addObject:file];
                     }
                 }
             }
         }

GTLDriveFile会传递数组中的对象

GTLDriveFile *file=[driveFiles objectAtIndex:indexPath.row];

这是下载文件的代码

NSString *link;
        if (file.webContentLink){
            link=file.webContentLink;
        }
        else if(file.embedLink){
            link=file.embedLink;
        }
        else
        {
            UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"ERROR" message:@"File has no downloadable link" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
            [alert show];
        }

        if (link) {

            NSString *downloadUrl = file.downloadUrl;
            GTMHTTPFetcher *fetcher =  [self.driveService.fetcherService fetcherWithURLString:downloadUrl];
            //async call to download the file data
            [fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error) {

                if (error == nil) {
                    if ( data ){
                            NSString *dirPath = [self directoryPathForSavingFile];
                            NSString *filePath = [dirPath stringByAppendingPathComponent:file.title];

                            [self saveFileJSONData:data forFileName:filePath withCompletionHandler:^(BOOL successStatus) {
                                // Adding skip attribute to avoid data sinking in iCloud
                                BOOL path =  [[NSFileManager defaultManager] fileExistsAtPath:filePath];
                                if (path) {
                                    NSLog(@"filePath %@",filePath);
                                }
                            }];
                    }

                } else {
                    NSLog(@"An error occurred: %@", error);
                }
            }];

        }

保存文件的目录路径代码

-(NSString*)directoryPathForSavingFile:(NSString *)directoryName
{
    NSString *applicationDirectory= [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    applicationDirectory = [applicationDirectory stringByAppendingPathComponent:directoryName];
    return applicationDirectory;
}

如何下载文件谷歌驱动器api ios

1 个答案: