Using WinInet to identify total file size before downloading it

Question

I got the source below from a third-party site explaining how to download a file from the internet using WinInet. I\'m not too familiar with API, and I took at

Answer 1

after fixing the types it looks better like this:

function GetContentLength(URLHandle:HINTERNET):Int64;
// returns the expected download size.  Returns -1 if one not provided
var
 SBufferSize, srv:Cardinal;
begin
 srv:=0;
 SBufferSize:=20;
 if Not HttpQueryInfo(URLHandle, HTTP_QUERY_CONTENT_LENGTH or HTTP_QUERY_FLAG_NUMBER, {@SBuffer} @Result, SBufferSize, srv) then Result:=-1;
end;

to call it:

{get the file handle}
hURL:=InternetOpenURL(hSession, PChar(URL), nil, 0, 0, 0);
if hURL=Nil then
begin
 InternetCloseHandle(hSession);
 ShowMessage('The link is incorrect!');
 exit;
end;
{get the file size}
filesize:=GetContentLength(hURL);