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adodbwshjscript

Windows Script Host (jscript): how do i download a binary file?

i'm trying to automate a file download with Windows Script Host (JScript). i see ADODB.Stream has an Open method whose documentation makes it seem like it should be possible to open a HTTP URL and stream the response body:

var url = 'http://example.com/example.tar.gz';
var path = 'example.tar.gz';

var input = WScript.CreateObject('ADODB.Stream');

input.Open(url);
input.SaveToFile(path);
input.Close();

But it bombs on the Open call with

(null): Object or data matching the name, range, or selection criteria was not found within the scope of this operation.

Solution

  • Here is the download code in JScript. Also added some references to API information.

    var Source = WScript.Arguments.Item(0);
var Target = WScript.Arguments.Item(1);
var Object = WScript.CreateObject('MSXML2.XMLHTTP');

Object.Open('GET', Source, false);
Object.Send();

if (Object.Status == 200)
{
    // Create the Data Stream
    var Stream = WScript.CreateObject('ADODB.Stream');

    // Establish the Stream
    Stream.Open();
    Stream.Type = 1; // adTypeBinary
    Stream.Write(Object.ResponseBody);
    Stream.Position = 0;

    // Create an Empty Target File
    var File = WScript.CreateObject('Scripting.FileSystemObject');
    if (File.FileExists(Target))
    {
        File.DeleteFile(Target);
    }

    // Write the Data Stream to the File
    Stream.SaveToFile(Target, 2); // adSaveCreateOverWrite
    Stream.Close();
}

    ADODB Stream:

    Scripting.FileSystemObject: