I'm seeing a curious problem in the interaction of a KeyDown event
handler and Valentina. I have an EditField that holds a date. When
the date is changed, I retrieve some data from the database and load it
into a Listbox. The + and - minus keys increment and decrement the
date, and so trigger the database search.
The immediate problem is that when I type several + or - quickly, my
application crashes silently. Vigorous logging shows that a call is
made to Valentina's SQLSelect function before the previous one has
returned, which I suspect is causing Valentina to crash. This happens
because the EditField.KeyDown event handler is being called in response
to a key press before the previous KeyDown event handler has exited;
the log data suggests that REALbasic is calling the next KeyDown while
Valentina is in the middle of its SQLSelect call.
I wonder how this can happen. I guess that somehow a cycle of the
event loop is occurring while Valentina is executing an SQLSelect ot
something; I am most perplexed. This only occurs when connecting to a
remote database; I don't know if Valentina is just so much faster
locally that no timing problem occurs, or if there is something more
fundamentally different.
--------------
Charles Yeomans
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