AHK - Download HTML data to a file

DownloadToFile.ahk

DownloadToFile(url, filename)
{
    static a := "AutoHotkey/" A_AhkVersion
    if (!(o := FileOpen(filename, "w")) || !DllCall("LoadLibrary", "str", "wininet") || !(h := DllCall("wininet\InternetOpen", "str", a, "uint", 1, "ptr", 0, "ptr", 0, "uint", 0, "ptr")))
        return 0
    c := s := 0
    if (f := DllCall("wininet\InternetOpenUrl", "ptr", h, "str", url, "ptr", 0, "uint", 0, "uint", 0x80003000, "ptr", 0, "ptr"))
    {
        while (DllCall("wininet\InternetQueryDataAvailable", "ptr", f, "uint*", s, "uint", 0, "ptr", 0) && s > 0)
        {
            VarSetCapacity(b, s, 0)
            DllCall("wininet\InternetReadFile", "ptr", f, "ptr", &b, "uint", s, "uint*", r)
            c += r
            o.rawWrite(b, r)
        }
        DllCall("wininet\InternetCloseHandle", "ptr", f)
    }
    DllCall("wininet\InternetCloseHandle", "ptr", h)
    o.close()
    return c
}