Presumably the problem is caused by calling your function from a
different thread.
Perhaps it is a solution to put the SerOpen in a thread created by FPC
and signal that thread from your dot-net-called function.
Am 09.03.24 um 16:24 schrieb Luca Olivetti via fpc-pascal:
I'm writing a dll that is used by a dot net application (32bits).
If I call SerOpen in the initialization section of the dll there is no
problem, but if I call it from one of the exported functions it gives
me an access denied (GetLastError gives me a 5), and I really need to
call it from a function (due to some quirks in the calling program
which is not under my control).
A search in the usual places tells me that in dot net opening a serial
port with CreateFile (which is what SerOpen does) is forbidden, that
you should use the SerialPort class (which I don't think I can do from
my dll written in freepascal).
Is there any way to solve my problem?
Bye
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