CodingForums.com - View Single Post - forcing asp download problems with large files

Old Pedant · 10-08-2012, 07:04 AM

It depends on where your problem is.

If the file is too large to load into the stream with LoadFromFile then there is no easy answer.

If the problem is simply that your Response buffer is too small, then it's fixable.

objStream.Read can take one argument: The number of bytes to read. So you can do this in chunks.

EXAMPLE ONLY:

In place of

Code:

Response.BinaryWrite objStream.Read

you could try doing:

Code:

CONST CHUNK = 100000 ' experiment to get best chunk size
byteCount = objStream.Size
Do While byteCount > CHUNK
    Response.BinaryWrite objStream.Read(CHUNK)
    Response.Flush
    byteCount = byteCount - CHUNK
Loop
Response.BinaryWrite objStream.Read(byteCount)

This is untested code. I remember doing something like this almost 10 years ago, so I'm really dredging this out of vary old human memory. (Both the human and the memory are old.)

10-08-2012, 07:04 AM	PM User \| #2
Old Pedant Supreme Master coder! Join Date: Feb 2009 Posts: 23,187 Thanks: 59 Thanked 3,995 Times in 3,964 Posts	It depends on where your problem is. If the file is too large to load into the stream with LoadFromFile then there is no easy answer. If the problem is simply that your Response buffer is too small, then it's fixable. objStream.Read can take one argument: The number of bytes to read. So you can do this in chunks. EXAMPLE ONLY: In place of Code: Response.BinaryWrite objStream.Read you could try doing: Code: CONST CHUNK = 100000 ' experiment to get best chunk size byteCount = objStream.Size Do While byteCount > CHUNK Response.BinaryWrite objStream.Read(CHUNK) Response.Flush byteCount = byteCount - CHUNK Loop Response.BinaryWrite objStream.Read(byteCount) This is untested code. I remember doing something like this almost 10 years ago, so I'm really dredging this out of vary old human memory. (Both the human and the memory are old.) __________________ An optimist sees the glass as half full. A pessimist sees the glass as half empty. A realist drinks it no matter how much there is.