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(C#) Streaming Download Large File to the Local FilesystemDownloads a large file in a streaming fashion to the local filesystem.
// Azure File Service Example: Downloads a large file to the local filesystem using a Chilkat stream. // See: https://docs.microsoft.com/en-us/rest/api/storageservices/get-file // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Rest rest = new Chilkat.Rest(); // Connect to the Azure Storage Blob Service bool bTls = true; int port = 443; bool bAutoReconnect = true; // In this example, the storage account name is "chilkat". bool success = rest.Connect("chilkat.file.core.windows.net",port,bTls,bAutoReconnect); if (success != true) { Debug.WriteLine(rest.LastErrorText); return; } // Provide Azure Cloud credentials for the REST calls. Chilkat.AuthAzureStorage azAuth = new Chilkat.AuthAzureStorage(); azAuth.AccessKey = "AZURE_ACCESS_KEY"; // The account name used here should match the 1st part of the domain passed in the call to Connect (above). azAuth.Account = "chilkat"; azAuth.Scheme = "SharedKey"; azAuth.Service = "File"; // This causes the "x-ms-version: 2020-08-04" header to be automatically added. azAuth.XMsVersion = "2020-08-04"; success = rest.SetAuthAzureStorage(azAuth); // Note: The application does not need to explicitly set the following // headers: x-ms-date, Authorization. These headers // are automatically set by Chilkat. // When streaming a download to the local filesystem or directed elsewhere, // the complete HTTP GET operation must be broken into parts. // For example, an HTTP GET consists of sending the request, followed by reading the response header, // and then finally the response body. We'll want to read the response header, and then based // on the information received (such as success or failure), either read the response body // as an error message, or as the file data. // Send the HTTP GET request to download the file. // The share is named "pip". success = rest.SendReqNoBody("GET","/pip/somethingBig.zip"); if (success != true) { Debug.WriteLine(rest.LastErrorText); return; } // Read the response header. int responseStatusCode = rest.ReadResponseHeader(); if (responseStatusCode < 0) { Debug.WriteLine(rest.LastErrorText); return; } Debug.WriteLine("Response status code = " + Convert.ToString(responseStatusCode)); // We expect a 200 response status if the file data is coming. // Otherwise, we'll get a string response body with an error message(or no response body). if (responseStatusCode == 200) { Chilkat.Stream bodyStream = new Chilkat.Stream(); // The stream's sink will be a file. bodyStream.SinkFile = "qa_output/somethingBig.zip"; // Read the response body to the stream. Given that we've // set the stream's sink to a file, it will stream directly // to the file. success = rest.ReadRespBodyStream(bodyStream,true); if (success != true) { Debug.WriteLine(rest.LastErrorText); return; } Debug.WriteLine("Successfully received the large file."); } else { string errResponse = rest.ReadRespBodyString(); if (rest.LastMethodSuccess != true) { Debug.WriteLine(rest.LastErrorText); } else { Debug.WriteLine(errResponse); } } |
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