Is there a native ActiveX Object or similar that I can use to download a source file straight to my HDD. Currently I'm using the following:
function downloadToFile(url, file) {
var xhr = new ActiveXObject("msxml2.xmlhttp"),
ado = new ActiveXObject("ADODB.Stream");
xhr.open("GET", url, false);
xhr.send();
if (xhr.status === 200) {
ado.type = 1;
ado.open();
ado.write(xhr.responseBody);
ado.saveToFile(file);
ado.close();
}
}
But this feels a bit inefficient for a few reasons:
I'm currently using two objects in place of what could possibly be a single object.
The entire response is stored in memory until its wrote to file. This isn't an issue for the most part until I use it to download fairly large files.
Notes/Edits:
I'm working from within microsoft's MSScriptControl.ScriptControl so many web-based libraries will not help.
I'm not necessarily looking for a single object if an answer is able to write the data to file as it is received.
BITSAdmin is a Windows command-line tool for downloading and uploading files using the Background Intelligent Transfer Service (BITS).
Note: In Windows 7, BITSAdmin states it's deprecated in favor of PowerShell BITS cmdlets, and may not be included in future Windows versions.
Syntax:
bitsadmin /transfer job_name url local_name
JScript version:
var oShell = new ActiveXObject("WScript.Shell");
oShell.Run("bitsadmin /transfer myDownloadJob http://upload.wikimedia.org/wikipedia/en/b/bc/Wiki.png C:\\Work\\wikipedia-logo.png");
If you have .NET Framework, you can register the System.Net.WebClient class for COM access:
C:\Windows\Microsoft.NET\Framework\v4.0.30319> regasm System.dll
and then use it like this:
var strURL = "http://upload.wikimedia.org/wikipedia/en/b/bc/Wiki.png";
var strFilePath = "C:\\Work\\wikipedia-logo.png";
var oWebClient = new ActiveXObject("System.Net.WebClient");
oWebClient.DownloadFile(strURL, strFilePath);
Chilkat HTTP ActiveX library (commercial) lets you download files directly:
var strURL = "http://upload.wikimedia.org/wikipedia/en/b/bc/Wiki.png";
var strFilePath = "C:\\Work\\wikipedia-logo.png";
var oHTTP = new ActiveXObject("Chilkat_9_5_0.Http");
// Any string unlocks the component for the 1st 30-days.
var success = oHTTP.UnlockComponent("Anything for 30-day trial");
if (success != 1) {
WScript.Echo(oHTTP.LastErrorText);
WScript.Quit();
}
success = oHTTP.Download(strURL, strFilePath);
if (success != 1)
WScript.Echo(oHTTP.LastErrorText);
Or how about shelling out to cURL (free, MIT/X derivate license)? Though I guess it counts as two objects because of WScript.Shell:
var oShell = new ActiveXObject("WScript.Shell");
oShell.Run("curl -o C:\\Work\\wikipedia-logo.png http://upload.wikimedia.org/wikipedia/en/b/bc/Wiki.png");
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