Doug, It is probably a Windows/memory problem. You just can't make file streams that big. Your filestream code tries to swallow the entire PDF file whole into memory and *then* send it via HTTP to the client. If you try to read a file that is too large, your filestream read code will fail.
You probably should use a small (16-64K) buffer and "loop" through the PDF file, one buffer load at a time. Send the buffer to the client and repeat. A small buffer created as a local variable will work fine. Using a buffer lets you work on files of any size - multiple gigabytes, if necessary. Remember that the last buffer load is probably only partially filled - you will have to count the number of actual bytes read into the buffer and make sure you only send that many to the client. Yeah, I know this is the old school way to do file transfers, but it actually works with (very) large files. I have a similar problem with a ^...@#&! web browser unit/component I use to spider an SSL-secured web site and download files. The guy that wrote the component also used TFileStream, and it bombs on files larger than about 20MB - great planning in this day and age of large files. I have a bunch of 2-4 GB files to download, so the component is useless to me until I get around to rewriting the idiot thing. :-( Don't be that guy ;-) Best regards, Kevin G. McCoy --- In [email protected], Doug Hale <del...@...> wrote: > > I am using Delphi 7 > Window XP SP3 > Apache 2.2.14 > > I have an APACHE CGI module that I have developed. It transfers PDF > files to a request via HTTP. > > the code: > > procedure TWebModule1. GetDocument(Response: TWebResponse;Path, DocId : > String); > var > Filename : String; > ... > > begin > Filename := GetDocName(Path, DocId); > > ... > > Fs := TFileStream.Create(Filename, fmOpenRead, fmShareDenyNone); > Response.ContentType := 'application/pdf'; > try > Response.ContentStream := Fs; > Response.SendResponse; > except > on E: Exception do > begin > Msg('EXCEPT %s %d', [E.Message, E.HelpContext]); > end; > end; > end; > > The problem is that it won't correctly transfer files larger than around > 20Mbytes. Under that limit and everything is fine. > > Is this a Windows problem. > Is this an APACHE problem? A CGI interface problem? A TResponse > problem? ?????? > I have been looking at this for a long time with no clue. > > Any help at all would be greatly appreciated. > > Doug > P.S. The WebSite that uses it is http://www.doughale.info >
