(JavaScript) Download a Binary File into Memory

Downloads a binary file into memory.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// Azure File Service Example: Download a Binary File to Memory
// 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.

var rest = new CkRest();

// Connect to the Azure Storage Blob Service
var bTls = true;
var port = 443;
var bAutoReconnect = true;
// In this example, the storage account name is "chilkat".
success = rest.Connect("chilkat.file.core.windows.net",port,bTls,bAutoReconnect);
if (success == false) {
    console.log(rest.LastErrorText);
    return;
}

// Provide Azure Cloud credentials for the REST calls.
var azAuth = new CkAuthAzureStorage();
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: 2021-08-06" header to be automatically added.
azAuth.XMsVersion = "2021-08-06";
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.

// Send a GET request to download the file "penguins.jpg" to a BinData object.
// (The share name is "pip")
var bdFileContents = new CkBinData();
success = rest.FullRequestNoBodyBd("GET","/pip/wildlife/antarctic/penguins.jpg",bdFileContents);
if (success == false) {
    console.log(rest.LastErrorText);
    return;
}

// When successful, the response status will be 200.
// If a non-success status code is returned, then the bdFileContents actually contains the XML error message.
if (rest.ResponseStatusCode !== 200) {
    // Examine the request/response to see what happened.
    console.log("response status code = " + rest.ResponseStatusCode);
    console.log("response status text = " + rest.ResponseStatusText);
    console.log("response header: " + rest.ResponseHeader);
    var sbXmlErr = new CkStringBuilder();
    sbXmlErr.AppendBd(bdFileContents,"utf-8",0,0);
    console.log("response body (if any): " + sbXmlErr.GetAsString());
    console.log("---");
    console.log("LastRequestStartLine: " + rest.LastRequestStartLine);
    console.log("LastRequestHeader: " + rest.LastRequestHeader);
    return;
}

console.log("Size of the downloaded file = " + bdFileContents.NumBytes);

// See the online reference documentation for the BinData class for ways
// to access the bytes.

bdFileContents.WriteFile("qa_output/penguins.jpg");