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

[Luca Olivetti]

El 9/3/24 a les 16:24, Luca Olivetti via fpc-pascal ha escrit:

Never mind, I put the serial port access in a separate exe and the dll 
communicates with it via an udp socket.
I'd still like to know why I got an access denied when trying to open 
the port from an exported procedure, typical ms bullshit or another case 
of pebkac?

Bye


> 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