Chilkat HOME .NET Core C# Android™ AutoIt C C# C++ Chilkat2-Python CkPython Classic ASP DataFlex Delphi ActiveX Delphi DLL Go Java Lianja Mono C# Node.js Objective-C PHP ActiveX PHP Extension Perl PowerBuilder PowerShell PureBasic Ruby SQL Server Swift 2 Swift 3,4,5... Tcl Unicode C Unicode C++ VB.NET VBScript Visual Basic 6.0 Visual FoxPro Xojo Plugin
(.NET Core C#) OneDrive -- Streaming REST Download to FileDownloads the contents of a DriveItem directly to a file in the local filesystem using the Chilkat REST class. Note: This example requires Chilkat v9.5.0.69 or greater.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Rest rest = new Chilkat.Rest(); // Use your previously obtained access token here: // See the following examples for getting an access token: // Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint). // Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint). // Refresh Access Token (Azure AD v2.0 Endpoint). // Refresh Access Token (Azure AD Endpoint). // First connect to graph.microsoft.com. If there's a connectivity problem, we'll find out here. bool success = rest.Connect("graph.microsoft.com",443,true,true); if (success != true) { Debug.WriteLine(rest.LastErrorText); return; } // (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.) Chilkat.OAuth2 oauth2 = new Chilkat.OAuth2(); oauth2.AccessToken = "MICROSOFT_GRAPH_ACCESS_TOKEN"; rest.SetAuthOAuth2(oauth2); // Send the GET request to download the file. string uriPath = "/v1.0/me/drive/root:/Misc/wildlife/penguins.jpg:/content"; success = rest.SendReqNoBody("GET",uriPath); if (rest.LastMethodSuccess != true) { Debug.WriteLine(rest.LastErrorText); return; } // NOTE: This way of doing the HTTP GET (i.e. download) may be more cumbersome, but it // allows for finer control of handling errors. The connection establishment, the sending of the // request, the reading of the response header, and the reading of the response body (i.e. the file data) // are handled by separate method calls. If the response header indicates an error, we can read // the response body and treat it differently than if reading the file data. // Read the response header. int statusCode = rest.ReadResponseHeader(); Debug.WriteLine("Response Status Code = " + Convert.ToString(statusCode)); if (statusCode == 302) { // This is a redirect. Read the response body, if any, and then follow the redirect. // Usually the response body will be empty for a redirect, but we need to be sure to read // the response body just in case it exists. Chilkat.BinData discard = new Chilkat.BinData(); rest.ReadRespBd(discard); rest.Disconnect(10); // For OneDrive, the redirect URL does not need authorization because the only way // to have obtained the direct download URL is from an authenticated request. // In fact, if we leave the authentication present, the GET request to the redirect URL will fail. // Note: The ClearAuth method is introduced in v9.5.0.69. rest.ClearAuth(); // Follow the redirect URL... Chilkat.Url redirectUrl = rest.RedirectUrl(); Debug.WriteLine("Redirect Host: " + redirectUrl.Host); Debug.WriteLine("Redirect URI Path: " + redirectUrl.PathWithQueryParams); success = rest.Connect(redirectUrl.Host,redirectUrl.Port,redirectUrl.Ssl,true); if (success != true) { Debug.WriteLine(rest.LastErrorText); return; } // Send the request.. success = rest.SendReqNoBody("GET",redirectUrl.Path); if (rest.LastMethodSuccess != true) { Debug.WriteLine(rest.LastErrorText); return; } statusCode = rest.ReadResponseHeader(); Debug.WriteLine(rest.LastErrorText); Debug.WriteLine("Redirect Response Status Code = " + Convert.ToString(statusCode)); } if (statusCode >= 300) { // Read the error response body. Chilkat.StringBuilder sbJson = new Chilkat.StringBuilder(); success = rest.ReadRespSb(sbJson); if (success != true) { Debug.WriteLine(rest.LastErrorText); return; } Chilkat.JsonObject jsonErr = new Chilkat.JsonObject(); jsonErr.EmitCompact = false; jsonErr.LoadSb(sbJson); Debug.WriteLine(jsonErr.Emit()); return; } // Stream the response body directly to a local file. string localPath = "qa_output/penguins.jpg"; Chilkat.Stream stream = new Chilkat.Stream(); stream.SinkFile = localPath; success = rest.ReadRespBodyStream(stream,true); if (success != true) { Debug.WriteLine(rest.LastErrorText); return; } Debug.WriteLine("Successfully streamed a OneDrive file to the local filesystem."); |
© 2000-2023 Chilkat Software, Inc. All Rights Reserved.