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(Objective-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.
#import <CkoRest.h> #import <CkoOAuth2.h> #import <NSString.h> #import <CkoBinData.h> #import <CkoUrl.h> #import <CkoStringBuilder.h> #import <CkoJsonObject.h> #import <CkoStream.h> // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkoRest *rest = [[CkoRest alloc] init]; // 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" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: YES]; if (success != YES) { NSLog(@"%@",rest.LastErrorText); return; } // (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.) CkoOAuth2 *oauth2 = [[CkoOAuth2 alloc] init]; oauth2.AccessToken = @"MICROSOFT_GRAPH_ACCESS_TOKEN"; [rest SetAuthOAuth2: oauth2]; // Send the GET request to download the file. NSString *uriPath = @"/v1.0/me/drive/root:/Misc/wildlife/penguins.jpg:/content"; success = [rest SendReqNoBody: @"GET" uriPath: uriPath]; if (rest.LastMethodSuccess != YES) { NSLog(@"%@",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] intValue]; NSLog(@"%@%d",@"Response Status Code = ",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. CkoBinData *discard = [[CkoBinData alloc] init]; [rest ReadRespBd: discard]; [rest Disconnect: [NSNumber numberWithInt: 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... CkoUrl *redirectUrl = [rest RedirectUrl]; NSLog(@"%@%@",@"Redirect Host: ",redirectUrl.Host); NSLog(@"%@%@",@"Redirect URI Path: ",redirectUrl.PathWithQueryParams); success = [rest Connect: redirectUrl.Host port: redirectUrl.Port tls: redirectUrl.Ssl autoReconnect: YES]; if (success != YES) { NSLog(@"%@",rest.LastErrorText); return; } // Send the request.. success = [rest SendReqNoBody: @"GET" uriPath: redirectUrl.Path]; if (rest.LastMethodSuccess != YES) { NSLog(@"%@",rest.LastErrorText); return; } statusCode = [[rest ReadResponseHeader] intValue]; NSLog(@"%@",rest.LastErrorText); NSLog(@"%@%d",@"Redirect Response Status Code = ",statusCode); } if (statusCode >= 300) { // Read the error response body. CkoStringBuilder *sbJson = [[CkoStringBuilder alloc] init]; success = [rest ReadRespSb: sbJson]; if (success != YES) { NSLog(@"%@",rest.LastErrorText); return; } CkoJsonObject *jsonErr = [[CkoJsonObject alloc] init]; jsonErr.EmitCompact = NO; [jsonErr LoadSb: sbJson]; NSLog(@"%@",[jsonErr Emit]); return; } // Stream the response body directly to a local file. NSString *localPath = @"qa_output/penguins.jpg"; CkoStream *stream = [[CkoStream alloc] init]; stream.SinkFile = localPath; success = [rest ReadRespBodyStream: stream autoSetStreamCharset: YES]; if (success != YES) { NSLog(@"%@",rest.LastErrorText); return; } NSLog(@"%@",@"Successfully streamed a OneDrive file to the local filesystem."); |
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