The VB6 form processing data for updating db takes too long, so I included a
progress bar for informing user for the status. If user moves to other
programs and then back to my program, form is not refreshed while
theoretically progress bar is updated and 'not responding' may be given.

How can refresh form so progress bar is refreshed when is updated ? I am
refreshing form every time I update progress bar.

Thanks a lot in advance.

Presumably you're running the updating code in a closed loop and you are
updating the progress bar periodically within that loop? If so then place a
DoEvents in the loop, which will fix the "not responding" problem. You
should not update the progress bar nor use DoEvents more often than
nenessary, so if you are currently doing it at every iteration of the loop
then perhaps you might consider adding an extra variable to hold the time of
the last update, so that within the loop you can check the elapsed time
since the time of the last update and only perform another update if a
specific time period has elapsed, updating the contents of the variable to
the new current time as you do so. Half a dozen times per second should be
plenty.

If the loop is fast running (if it executes tens of thousands of times per
second or more) then use a timer that is quick to check, so that the minimum
amount of the overall time is spent checking it each time. Some timers take
a microsecond or more to check whereas others take just ten nanoseconds or
so. On my machine, for example, GetTickCount is the fastest, taking just 10
nanoseconds, which is twice as fast as timeGetTime, twenty times faster than
the VB Timer function and over a hundred times faster than
QueryPerformanceCounter. The resolution of GetTickCount is easily high
enough for your purposes, and it is very quick, so that is what I suggest
you use if the loop is very fast running.

Mike

Yes, my loop may be executed 5 million times or more, depending on the data
to be read and updated. I increase progress bar by 1 (max is 100), so is
executed 100 times, use variable for counting data read, divide data to be
read by 100. I included DoEvents in this procedure, so it will also be
executed 100 times.

Thanks a lot.

Add a DoEvents statement somewhere.  Depending on exactly what you're doing,
you might need more than one. What's happening is that your app is busy
doing the db update (and whatever else).  Screen redraws are a very low
priority so if your app is busy (for example, in a loop) while you need to
update forms or other screen elements, you need to specifically grant
Windows time to do that. The Refresh method of forms and controls frequently
is not sufficient whereas DoEvents gives Windows the time in needs to do
other things besides just refresh a specific form or control.  However, you
don't want to overdo your use of DoEvents either because it could cause
whatever you're doing to take longer (sometimes considerably longer).

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