var onlyNames = true; //Only include the name, not the full path and name
var includeFolders = true; //Include folders as well as files
var includeLinks = true; //Include links (shortcuts)

var files = sp.GetItemsInExplorer(action.Window.HWnd, onlyNames, includeFolders, includeLinks);
var str = "";
var delim = "";
//Loop through each item
for(i = 0; i < files.Length; i++)
{
    str = str + delim + files[i];
    delim = "\r\n";
}

if(str.length == 0) str = "(no items found)";
clip.SetText(str); //Copy the result to the clipboard