如何使用C＃GData API通過密鑰請求單個電子表格？

Question

我有一個認證程序，可以獲取使用GData API的C＃實現版本3的所有電子表格的列表（它遵循文檔中的the example）。我很難弄清楚如何通過它的文檔鍵來獲取單個資源。我可以在Google Documents List API中看到很多檢索文檔列表的例子，我可以看到如何通過exact name search將文檔清零，但我試圖生成一些代碼，這些代碼在重新命名的電子表格中生存。這裏是我到目前爲止已經編寫的代碼：

using System; 
using Google.GData.Client; 
using Google.GData.Spreadsheets; 
using Microsoft.VisualBasic; 

namespace q14201622 
{ 
    class Program 
    { 
    static void Main(string[] args) 
    { 
     //OAuth 2 Stuff 
     var parameters = new OAuth2Parameters() { 
     ClientId = CLIENT_ID, 
     ClientSecret = CLIENT_SECRET, 
     RedirectUri = REDIRECT_URI, 
     Scope = SCOPE 
     }; 
     Process.Start(OAuthUtil.CreateOAuth2AuthorizationUrl(parameters)); 
     var response = Interaction.InputBox("Enter oAuth Code:", "q14201622", "", 0, 0); 
     parameters.AccessCode = response; 
     OAuthUtil.GetAccessToken(parameters); 
     var accessToken = parameters.AccessToken; 

     //Fetch Documents 
     var requestFactory = new GOAuth2RequestFactory(null, "q14201622-v1", parameters); 
     var service = new SpreadsheetsService("q14201622-v1"); 
     var query = new SpreadsheetQuery(); 
     query.Title = "Exact Title"; 
     query.Exact = true; 

     //Iterate over the results 
     var feed = service.Query(query); 
     foreach (var entry in feed.Entries) 
     { 
     Console.WriteLine(entry.Id + ":"+ entry.Title.Text); 
     } 
    } 
    } 
} 

Answer 1

我沒有測試這一點，但根據本https://developers.google.com/gdata/client-cs您可以通過使用其URL請求特定條目：

FeedQuery singleQuery = new FeedQuery(); 
singleQuery.Uri = new Uri(newEntry.SelfUri.ToString()); 
AtomFeed newFeed = service.Query(singleQuery); 
AtomEntry retrievedEntry = newFeed.Entries[0];  

現在，如果您在文檔的關鍵，你也有URL（https://docs.google.com/spreadsheet/ccc?key=[insert這裏的關鍵]） 你可以使用一個簡單的

string docKey = "nice doc key"; 
string gDocsURL = "https://docs.google.com/spreadsheet/ccc?key={0}"; 
string docURL = String.Format(gDocsURL,docKey); 

然後

FeedQuery singleQuery = new FeedQuery(); 
singleQuery.Uri = new Uri(docURL); 
AtomFeed newFeed = service.Query(singleQuery); 
AtomEntry retrievedEntry = newFeed.Entries[0]; 

而且您應該能夠檢索文檔。 如果你想保存文檔到硬盤驅動器，只需添加

string docFormat ="xlsx";// or xls or csv or pdf etc. 
string gDocsDownloadURL="https://spreadsheets.google.com/feeds/download/spreadsheets/Export?key={0}&exportFormat={1}" 
string downloadUrl = String.format(gDocsDownloadURL,docKey,docFormat); 
Stream stream = service.Query(new Uri(downloadUrl)); 

Answer 2

我得罪了Google.Apis.Drive.v2客戶端庫NuGet包版本1.9.2.1890測試此。但是需要注意的是，您現在需要通過Google Developer's Console發現的here，向您的應用程序註冊開發人員的帳戶並使用Google API和設置API訪問權限和憑據。

如果你只想用這個服務帳戶又名不能代表用戶，但對於自動化或內部工具訪問文件，使用這樣的：

（如果我沒有記錯的服務帳戶仍需要由通過OAuth的瀏覽器彈出一個人一次性的OAuth認證的交互的應用程序添加到服務帳戶授權的應用程序）

private const string SERVICE_ACCOUNT_EMAIL = "YOUR_SERVICE_ACCOUNT_EMAIL_HERE"; //looks like XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX@developer.gserviceaccount.com; 

static DriveService BuildServiceAccountService() 
{ 
    var certificate = new X509Certificate2(PATH_TO_YOUR_X509_CERT, 
     "notasecret", X509KeyStorageFlags.Exportable); 
    var credential = new ServiceAccountCredential(
     new ServiceAccountCredential.Initializer(SERVICE_ACCOUNT_EMAIL) 
     { 
      Scopes = new[] { DriveService.Scope.Drive }, 
      User = "ACTUAL_EMAIL_ADDRESS" // this should be the normal xxxxxx@gmail account that has the google drive files 
     }.FromCertificate(certificate)); 

    // Create the service. 
    var service = new DriveService(new BaseClientService.Initializer() 
    { 
     HttpClientInitializer = credential, 
     ApplicationName = "Drive API Service Account Sample", 
    }); 

    return service; 
} 

public static void DownloadSpreadsheetAsXlsx(string spreadsheetName, string filePath) 
{ 
    var service = BuildServiceAccountService(); 
    var request = service.Files.List(); 
    request.Q = String.Format("title = '{0}'", spreadsheetName); 
    var files = request.Execute(); 
    var file = files.Items.FirstOrDefault(); 

    var dlUrl = String.Format("https://docs.google.com/spreadsheets/d/{0}/export?format=xlsx&id={0}", file.Id); 

    File.WriteAllBytes(filePath, service.HttpClient.GetByteArrayAsync(dlUrl).Result); 
} 

要訪問代表用戶的文件，你會需要像這可以建立您的服務：

static DriveService BuildUserAccountService(string userEmail) 
{ 
    UserCredential credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
    new ClientSecrets 
    { 
    ClientId = "YOUR_CLIENT_ID", // your client Id 
    ClientSecret = "YOUR_CLIENT_SECRET", // Your client secret 
    }, 
    new[] { DriveService.Scope.Drive }, 
    userEmail, 
    CancellationToken.None).Result; 

    // Create the service. 
    var service = new DriveService(new BaseClientService.Initializer() 
    { 
     HttpClientInitializer = credential, 
     ApplicationName = "Drive API User Account Sample", 
    }); 

    return service; 
} 

老答案留給後人的緣故（老谷歌的GData API已被棄用，下面這點東西不再是相關的，不應該被預期工作）：

我有同樣的問題找到文檔密鑰。我最終在AlternateUri中找到了它。這裏是我做了什麼（這已被編譯並確認一個新的項目工作，並添加GData.Spreadsheets用的NuGet）：

//Use your authentication method here:  
SpreadsheetsService service = new SpreadsheetsService("DownloadSpreadsheet"); 
service.setUserCredentials("your username", "your password"); 

SpreadsheetQuery query = new SpreadsheetQuery(); 
SpreadsheetFeed feed = service.Query(query); 
SpreadsheetEntry fileEntry = feed.Entries.Cast<SpreadsheetEntry>().FirstOrDefault(entry => entry.Title.Text == "Name of spreadsheet"); 

//This is the good part 
string key = fileEntry.AlternateUri.Content.Substring(fileEntry.AlternateUri.Content.IndexOf("?key=")); 
string dlUrl = "https://docs.google.com/feeds/download/spreadsheets/Export" + key + "&exportFormat=xlsx&format=xlsx"; 
Stream stream = service.Query(new Uri(dlUrl)); 
using (FileStream fstream = new FileStream("something.xlsx", FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite)) 
{ 
    stream.CopyTo(fstream); 
    fstream.Flush(); 
} 

我應該指出，這需要LINQ（.NET Framework 3.5或更高版本），由於到.Cast<SpreadsheetEntry>().FirstOrDefault()一行。這可以在沒有LINQ的情況下完成，您只需手動枚舉電子表格並找到您正在查找的電子表格，而不是使用一行代碼執行此操作。我只是想確保在他們開始報告它不起作用之前，每個人都知道。