Re: Send_File API versus Send API over a Socket -- RPG400-L

Why don't you use FTP?

Albert

----- Original Message -----
From: "sodonnell@xxxxxxxxxxxxxxxxxxxxxxxxx" <sodonnell@xxxxxxxxxxxxxxxxxxxxxxxxx>
To: rpg400-l@xxxxxxxxxxxx
Subject: Send_File API versus Send API over a Socket
Date: Wed, 28 Nov 2007 15:01:35 -0500

Hello,

I have an application that reads an image file off of the IFS (it's
a TIFF file if that makes a difference...) and then I send it to a
PC over a
socket.

I'm using the _C_IFS_OPEN and _C_IFS_GETS to read the file and I'm
using the Unix-type API Send to send the file across the socket.

The problem I'm having is that somewhere along the way, my image
file is getting corrupted. That is, the first few lines of the
image data are fine,
and in fact, you can even make out a little bit of what the image
is if you look at it in Windows. But somewhere between the last
point where I have
good data and the end of the file (or possibly including the end of
the file too), my image data gets altered.

If I look at the file in Notepad or Wordpad or even in a DOS
prompt, I can see that the data is MOSTLY correct. however, there
are places where the
data is obviously different. And since it's in hex (or whatever...)
it's impossible for me to look at it and say, "Oh, there's a line
feed or carriage
return there where there shouldn't be."

So, what I'm wondering is... If I used the Send_File API (instead
of SEND and the _OPEN and _GETS APIs (as shown above)), do you
think my chances of
avoiding trashed data would improve? I guess I could just try it
and see but I was hoping someone might have used Send_File before
and had some
experience with it.

There are 3 distinct points where the data could be getting hosed
in this process:

1. When I read the data using the _C_IFS_GETS API.
2. When the data is sent across the socket from my RPGLE program.
3. When the data is received at the socket server.

The last one does not seem as likely simply because that process
has worked flawlessly for years. On the other hand, I don't know
if I've ever send
an image file like this before to it. This might be a first for me
as it's been awhile since I messed with any of this, I don't really
remember.

It seems more likely to me that the problem is either in the Read
or the file from the IFS or it's in the send across the socket.

Thoughts, opinions suggestions and anything else is welcome.

thanks,

Shannon O'Donnell

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