"Problem" fixed. It was me. The problem 1st showed up by copying the
file to another system over a network and resuming the app on the 2nd
system..... but it was copied while the file was still open and being
written to. The recorder app has been running for so long it sort of
became a fixed object here. If I allow it to close properly before
monkeying with it, no problem.
-R
On Oct 17, 2006, at 5:45 AM, Richard wrote:
I have an app that collects performance data for a network of radio
modems. It runs for days writing to a file about once a second
using a method having these two lines:
FAstream.WriteDouble v
FAstream.WritePString s
When the app is quit and started again later it's supposed to pick
up where it left off, appending data to the end of the file. It
does that just fine. The problem is when the data is analyzed
later, the file is found to be corrupt. I tracked this down to the
point where the app is quit and restarted. It seems that the last
WritePString that was executed prior to closing the file writes the
length byte but not the string itself.
This is a typical line from the WriteDouble and WritePString code
(the 1st 8 bytes are the double and the remainder is the Pstring):
41 E8 2B 2D 1F 20 00 00 2C F5 11 01 12 34 56 78 9A BC DE F0 76 00
00 00 00 00 00 00 08 00 00 22 00 00 1D 43 00 00 00 00 00 00 00 00
00 00 00 00 00 00 05 F9 BB
That 9th byte, the 2C, is the length byte for the Pstring. The
length is always 2C bytes. At the end of a closed file this is
what's there:
41 E8 2B 2D 1F 40 00 00 2C (eof)
The double, and the length byte of the Pstring, but no data.
Can anyone shed any light on this?
-Richard
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