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(Delphi ActiveX) 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, Chilkat_v9_5_0_TLB; ... procedure TForm1.Button1Click(Sender: TObject); var rest: TChilkatRest; success: Integer; oauth2: TChilkatOAuth2; uriPath: WideString; statusCode: Integer; discard: TChilkatBinData; redirectUrl: IChilkatUrl; sbJson: TChilkatStringBuilder; jsonErr: TChilkatJsonObject; localPath: WideString; stream: TChilkatStream; begin // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. rest := TChilkatRest.Create(Self); // 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 := rest.Connect('graph.microsoft.com',443,1,1); if (success <> 1) then begin Memo1.Lines.Add(rest.LastErrorText); Exit; end; // (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.) oauth2 := TChilkatOAuth2.Create(Self); oauth2.AccessToken := 'MICROSOFT_GRAPH_ACCESS_TOKEN'; rest.SetAuthOAuth2(oauth2.ControlInterface); // Send the GET request to download the file. uriPath := '/v1.0/me/drive/root:/Misc/wildlife/penguins.jpg:/content'; success := rest.SendReqNoBody('GET',uriPath); if (rest.LastMethodSuccess <> 1) then begin Memo1.Lines.Add(rest.LastErrorText); 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 := rest.ReadResponseHeader(); 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 := TChilkatBinData.Create(Self); rest.ReadRespBd(discard.ControlInterface); 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... redirectUrl := rest.RedirectUrl(); Memo1.Lines.Add('Redirect Host: ' + redirectUrl.Host); Memo1.Lines.Add('Redirect URI Path: ' + redirectUrl.PathWithQueryParams); success := rest.Connect(redirectUrl.Host,redirectUrl.Port,redirectUrl.Ssl,1); if (success <> 1) then begin Memo1.Lines.Add(rest.LastErrorText); Exit; end; // Send the request.. success := rest.SendReqNoBody('GET',redirectUrl.Path); if (rest.LastMethodSuccess <> 1) then begin Memo1.Lines.Add(rest.LastErrorText); Exit; end; statusCode := rest.ReadResponseHeader(); Memo1.Lines.Add(rest.LastErrorText); Memo1.Lines.Add('Redirect Response Status Code = ' + IntToStr(statusCode)); end; if (statusCode >= 300) then begin // Read the error response body. sbJson := TChilkatStringBuilder.Create(Self); success := rest.ReadRespSb(sbJson.ControlInterface); if (success <> 1) then begin Memo1.Lines.Add(rest.LastErrorText); Exit; end; jsonErr := TChilkatJsonObject.Create(Self); jsonErr.EmitCompact := 0; jsonErr.LoadSb(sbJson.ControlInterface); Memo1.Lines.Add(jsonErr.Emit()); Exit; end; // Stream the response body directly to a local file. localPath := 'qa_output/penguins.jpg'; stream := TChilkatStream.Create(Self); stream.SinkFile := localPath; success := rest.ReadRespBodyStream(stream.ControlInterface,1); if (success <> 1) then begin Memo1.Lines.Add(rest.LastErrorText); Exit; end; Memo1.Lines.Add('Successfully streamed a OneDrive file to the local filesystem.'); end; |
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