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(Lianja) 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. loRest = createobject("CkRest") // 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. llSuccess = loRest.Connect("graph.microsoft.com",443,.T.,.T.) if (llSuccess <> .T.) then ? loRest.LastErrorText release loRest return endif // (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.) loOauth2 = createobject("CkOAuth2") loOauth2.AccessToken = "MICROSOFT_GRAPH_ACCESS_TOKEN" loRest.SetAuthOAuth2(loOauth2) // Send the GET request to download the file. lcUriPath = "/v1.0/me/drive/root:/Misc/wildlife/penguins.jpg:/content" llSuccess = loRest.SendReqNoBody("GET",lcUriPath) if (loRest.LastMethodSuccess <> .T.) then ? loRest.LastErrorText release loRest release loOauth2 return endif // 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. lnStatusCode = loRest.ReadResponseHeader() ? "Response Status Code = " + str(lnStatusCode) if (lnStatusCode = 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. loDiscard = createobject("CkBinData") loRest.ReadRespBd(loDiscard) loRest.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. loRest.ClearAuth() // Follow the redirect URL... loRedirectUrl = loRest.RedirectUrl() ? "Redirect Host: " + loRedirectUrl.Host ? "Redirect URI Path: " + loRedirectUrl.PathWithQueryParams llSuccess = loRest.Connect(loRedirectUrl.Host,loRedirectUrl.Port,loRedirectUrl.Ssl,.T.) if (llSuccess <> .T.) then ? loRest.LastErrorText release loRest release loOauth2 release loDiscard return endif // Send the request.. llSuccess = loRest.SendReqNoBody("GET",loRedirectUrl.Path) release loRedirectUrl if (loRest.LastMethodSuccess <> .T.) then ? loRest.LastErrorText release loRest release loOauth2 release loDiscard return endif lnStatusCode = loRest.ReadResponseHeader() ? loRest.LastErrorText ? "Redirect Response Status Code = " + str(lnStatusCode) endif if (lnStatusCode >= 300) then // Read the error response body. loSbJson = createobject("CkStringBuilder") llSuccess = loRest.ReadRespSb(loSbJson) if (llSuccess <> .T.) then ? loRest.LastErrorText release loRest release loOauth2 release loDiscard release loSbJson return endif loJsonErr = createobject("CkJsonObject") loJsonErr.EmitCompact = .F. loJsonErr.LoadSb(loSbJson) ? loJsonErr.Emit() release loRest release loOauth2 release loDiscard release loSbJson release loJsonErr return endif // Stream the response body directly to a local file. lcLocalPath = "qa_output/penguins.jpg" loStream = createobject("CkStream") loStream.SinkFile = lcLocalPath llSuccess = loRest.ReadRespBodyStream(loStream,.T.) if (llSuccess <> .T.) then ? loRest.LastErrorText release loRest release loOauth2 release loDiscard release loSbJson release loJsonErr release loStream return endif ? "Successfully streamed a OneDrive file to the local filesystem." release loRest release loOauth2 release loDiscard release loSbJson release loJsonErr release loStream |
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