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(Xojo Plugin) 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. Dim rest As 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. Dim success As Boolean success = rest.Connect("graph.microsoft.com",443,True,True) If (success <> True) Then System.DebugLog(rest.LastErrorText) Return End If // (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.) Dim oauth2 As New Chilkat.OAuth2 oauth2.AccessToken = "MICROSOFT_GRAPH_ACCESS_TOKEN" success = rest.SetAuthOAuth2(oauth2) // Send the GET request to download the file. Dim uriPath As String uriPath = "/v1.0/me/drive/root:/Misc/wildlife/penguins.jpg:/content" success = rest.SendReqNoBody("GET",uriPath) If (rest.LastMethodSuccess <> True) Then System.DebugLog(rest.LastErrorText) Return End If // 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. Dim statusCode As Int32 statusCode = rest.ReadResponseHeader() System.DebugLog("Response Status Code = " + Str(statusCode)) If (statusCode = 302) Then // 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. Dim discard As New Chilkat.BinData success = rest.ReadRespBd(discard) success = 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. success = rest.ClearAuth() // Follow the redirect URL... Dim redirectUrl As Chilkat.Url redirectUrl = rest.RedirectUrl() System.DebugLog("Redirect Host: " + redirectUrl.Host) System.DebugLog("Redirect URI Path: " + redirectUrl.PathWithQueryParams) success = rest.Connect(redirectUrl.Host,redirectUrl.Port,redirectUrl.Ssl,True) If (success <> True) Then System.DebugLog(rest.LastErrorText) Return End If // Send the request.. success = rest.SendReqNoBody("GET",redirectUrl.Path) If (rest.LastMethodSuccess <> True) Then System.DebugLog(rest.LastErrorText) Return End If statusCode = rest.ReadResponseHeader() System.DebugLog(rest.LastErrorText) System.DebugLog("Redirect Response Status Code = " + Str(statusCode)) End If If (statusCode >= 300) Then // Read the error response body. Dim sbJson As New Chilkat.StringBuilder success = rest.ReadRespSb(sbJson) If (success <> True) Then System.DebugLog(rest.LastErrorText) Return End If Dim jsonErr As New Chilkat.JsonObject jsonErr.EmitCompact = False success = jsonErr.LoadSb(sbJson) System.DebugLog(jsonErr.Emit()) Return End If // Stream the response body directly to a local file. Dim localPath As String localPath = "qa_output/penguins.jpg" Dim stream As New Chilkat.Stream stream.SinkFile = localPath success = rest.ReadRespBodyStream(stream,True) If (success <> True) Then System.DebugLog(rest.LastErrorText) Return End If System.DebugLog("Successfully streamed a OneDrive file to the local filesystem.") |
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