[fpc-pascal] opening a serial port in a dll called from dot net fails

[Luca Olivetti]

El 11/3/24 a les 11:38, Elmar Haneke via fpc-pascal ha escrit:
> 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.
> 

Nope, I tried, same error.


> 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?