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BfvLineDumpStructure
November 2009 93
BfvLineDumpStructure
The BfvLineDumpStructure function (Volume 1, Bfv API
Reference Manual) dumps the contents of the BTLINE structure into
a file. It writes each element of the line structure individually.
Use this call to create error report logs (along with the contents of
Dump History) and to track changing states of the line.
Dump History
Dump History (dh) is a stand-alone utility, which displays to the
screen a log of the interactions between the driver and channels,
modules, and applications. The size is specified at driver
configuration time. The default is a buffer size of approximately 1MB
for the entire driver.
To use the Dump History utility, you must enable the debug option
during installation of the driver. See Chapter 1, Manually
Configuring the Driver on Windows® in your installation and
configuration guide for instructions on how to enable the debug
option. Once enabled, driver operations are automatically logged
with a time stamp in a circular buffer.
Using dump history, in any form, can have effect on the system.
Enabling history at all, regardless of the configured size, slows the
operation of the driver down to a small degree. If the history size is
set to a very large value (e.g., a number of megabytes), then actually
getting the history slows the system down in ways that affects any
other Bfv API applications running.
This is because of several factors:
The driver requires time to copy history memory. All other
standard driver operations are temporarily suspended.
The history functions require time to parse the history memory
into readable form.
High disk load while writing the many megabytes of history data
in a short time.