Lua

Download a Text File into a String

See more Azure Cloud Storage Examples

Downloads a text file to a string variable. Lua

local chilkat = require("chilkat")

-- Azure File Service Example: Download Text File into String
-- 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.

local rest = chilkat.Rest.new()

-- Connect to the Azure Storage Blob Service
local bTls = true
local port = 443
local bAutoReconnect = true
-- In this example, the storage account name is "chilkat".
local success = rest:connect("chilkat.file.core.windows.net", port, bTls, bAutoReconnect)
if not success then
    print(rest.last_error_text)
    return
end

-- Provide Azure Cloud credentials for the REST calls.
local azAuth = chilkat.AuthAzureStorage.new()
azAuth.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).
azAuth.account = "chilkat"
azAuth.scheme = "SharedKey"
azAuth.service = "File"
-- This causes the "x-ms-version: 2021-08-06" header to be automatically added.
azAuth.xms_version = "2021-08-06"
success = rest:set_auth_azure_storage(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 "hamlet.xml" to a StringBuilder object.
-- (The share name is "pip")
local sbFileContents = chilkat.StringBuilder.new()
success = rest:full_request_no_body_sb("GET", "/pip/xmlFiles/hamlet.xml", sbFileContents)
if not success then
    print(rest.last_error_text)
    return
end

-- When successful, the response status will be 200.
-- If a non-success status code is returned, then the sbFileContents actually contains the XML error message.
if rest.response_status_code ~= 200 then
    -- Examine the request/response to see what happened.
    print("response status code = " .. rest.response_status_code)
    print("response status text = " .. rest.response_status_text)
    print("response header: " .. rest.response_header)
    print("response body (if any): " .. sbFileContents:get_as_string())
    print("---")
    print("LastRequestStartLine: " .. rest.last_request_start_line)
    print("LastRequestHeader: " .. rest.last_request_header)
    return
end

print("Length of downloaded string = " .. sbFileContents.length)

local strFileContents = sbFileContents:get_as_string()
print(strFileContents)

sbFileContents:write_file("qa_output/hamlet.xml", "utf-8", false)