Rust

Download a Binary File into Memory

See more Azure Cloud Storage Examples

Downloads a binary file into memory. Rust

// 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.

let rest = chilkat::Rest::new();

// Connect to the Azure Storage Blob Service
let b_tls = true;
let port = 443;
let b_auto_reconnect = true;
// In this example, the storage account name is "chilkat".
if rest.connect("chilkat.file.core.windows.net", port, b_tls, b_auto_reconnect).is_err() {
    println!("{}", rest.last_error_text());
    return;
}

// Provide Azure Cloud credentials for the REST calls.
let az_auth = chilkat::AuthAzureStorage::new();
az_auth.set_access_key("AZURE_ACCESS_KEY");
// The account name used here should match the 1st part of the domain passed in the call to Connect (above).
az_auth.set_account("chilkat");
az_auth.set_scheme("SharedKey");
az_auth.set_service("File");
// This causes the "x-ms-version: 2021-08-06" header to be automatically added.
az_auth.set_x_ms_version("2021-08-06");
let _ = rest.set_auth_azure_storage(&az_auth).is_ok();

// 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")
let bd_file_contents = chilkat::BinData::new();
if rest.full_request_no_body_bd("GET", "/pip/wildlife/antarctic/penguins.jpg", &bd_file_contents).is_err() {
    println!("{}", rest.last_error_text());
    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.response_status_code() != 200 {
    // Examine the request/response to see what happened.
    println!("response status code = {}", rest.response_status_code());
    println!("response status text = {}", rest.response_status_text());
    println!("response header: {}", rest.response_header());
    let sb_xml_err = chilkat::StringBuilder::new();
    let _ = sb_xml_err.append_bd(&bd_file_contents, "utf-8", 0, 0);
    println!("response body (if any): {}", sb_xml_err.get_as_string().unwrap_or_default());
    println!("---");
    println!("LastRequestStartLine: {}", rest.last_request_start_line());
    println!("LastRequestHeader: {}", rest.last_request_header());
    return;
}

println!("Size of the downloaded file = {}", bd_file_contents.num_bytes());

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

let _ = bd_file_contents.write_file("qa_output/penguins.jpg");