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
(Delphi DLL) 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.
uses Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics, Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Url, JsonObject, OAuth2, StringBuilder, BinData, Stream, Rest; ... procedure TForm1.Button1Click(Sender: TObject); var rest: HCkRest; success: Boolean; oauth2: HCkOAuth2; uriPath: PWideChar; statusCode: Integer; discard: HCkBinData; redirectUrl: HCkUrl; sbJson: HCkStringBuilder; jsonErr: HCkJsonObject; localPath: PWideChar; stream: HCkStream; begin // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rest := CkRest_Create(); // 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. success := CkRest_Connect(rest,'graph.microsoft.com',443,True,True); if (success <> True) then begin Memo1.Lines.Add(CkRest__lastErrorText(rest)); Exit; end; // (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.) oauth2 := CkOAuth2_Create(); CkOAuth2_putAccessToken(oauth2,'MICROSOFT_GRAPH_ACCESS_TOKEN'); CkRest_SetAuthOAuth2(rest,oauth2); // Send the GET request to download the file. uriPath := '/v1.0/me/drive/root:/Misc/wildlife/penguins.jpg:/content'; success := CkRest_SendReqNoBody(rest,'GET',uriPath); if (CkRest_getLastMethodSuccess(rest) <> True) then begin Memo1.Lines.Add(CkRest__lastErrorText(rest)); Exit; end; // 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. statusCode := CkRest_ReadResponseHeader(rest); Memo1.Lines.Add('Response Status Code = ' + IntToStr(statusCode)); if (statusCode = 302) then begin // 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. discard := CkBinData_Create(); CkRest_ReadRespBd(rest,discard); CkRest_Disconnect(rest,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. CkRest_ClearAuth(rest); // Follow the redirect URL... redirectUrl := CkRest_RedirectUrl(rest); Memo1.Lines.Add('Redirect Host: ' + CkUrl__host(redirectUrl)); Memo1.Lines.Add('Redirect URI Path: ' + CkUrl__pathWithQueryParams(redirectUrl)); success := CkRest_Connect(rest,CkUrl__host(redirectUrl),CkUrl_getPort(redirectUrl),CkUrl_getSsl(redirectUrl),True); if (success <> True) then begin Memo1.Lines.Add(CkRest__lastErrorText(rest)); Exit; end; // Send the request.. success := CkRest_SendReqNoBody(rest,'GET',CkUrl__path(redirectUrl)); CkUrl_Dispose(redirectUrl); if (CkRest_getLastMethodSuccess(rest) <> True) then begin Memo1.Lines.Add(CkRest__lastErrorText(rest)); Exit; end; statusCode := CkRest_ReadResponseHeader(rest); Memo1.Lines.Add(CkRest__lastErrorText(rest)); Memo1.Lines.Add('Redirect Response Status Code = ' + IntToStr(statusCode)); end; if (statusCode >= 300) then begin // Read the error response body. sbJson := CkStringBuilder_Create(); success := CkRest_ReadRespSb(rest,sbJson); if (success <> True) then begin Memo1.Lines.Add(CkRest__lastErrorText(rest)); Exit; end; jsonErr := CkJsonObject_Create(); CkJsonObject_putEmitCompact(jsonErr,False); CkJsonObject_LoadSb(jsonErr,sbJson); Memo1.Lines.Add(CkJsonObject__emit(jsonErr)); Exit; end; // Stream the response body directly to a local file. localPath := 'qa_output/penguins.jpg'; stream := CkStream_Create(); CkStream_putSinkFile(stream,localPath); success := CkRest_ReadRespBodyStream(rest,stream,True); if (success <> True) then begin Memo1.Lines.Add(CkRest__lastErrorText(rest)); Exit; end; Memo1.Lines.Add('Successfully streamed a OneDrive file to the local filesystem.'); CkRest_Dispose(rest); CkOAuth2_Dispose(oauth2); CkBinData_Dispose(discard); CkStringBuilder_Dispose(sbJson); CkJsonObject_Dispose(jsonErr); CkStream_Dispose(stream); end; |
© 2000-2023 Chilkat Software, Inc. All Rights Reserved.