🚀 go-pugleaf

Another option is to use a component library:  TurboPower's Asynch, which is
now an open source product
on SourceForge.net  ?

it has a component, which generates these types of events and insulates you
from the low level handling details (that is if you want to be insulated
from these details <grin>)

just another option there,
hope that helps,
Sincerely,
J


"Michel Leunen" <mleu@STOPSPAMskynet.be> wrote in message
news:3facbd32$2@newsgroups.borland.com...
> Andre Letourneau wrote:
>
> > I would like to have a program respond to a character received on a
serial
> > port.
> > Is there a way to have a fonction called on a char. received without
having
> > to repetedly poll the port using
> > ReadFile() ??
>
> Look at overlapped file to read from your port asynchronously using
> events.  There is an example in the win32 help file. Also Look for
> CreateEvent(), WaitCommEvent().
> Basically, you have to do something like this:
>
> CreateFile(...,FILE_FLAG_OVERLAPPED,...);
> ...
>
> CreateEvent(...);
> if(!ReadFile(...))
> {
>    if(GetLastError() == ERROR_IO_PENDING) //the read operation could not
> be processed immediately
>    {
>      WaitForSingleObject(...); // wait until a char is received
>      if(GetOverlappedResult(...)) // get the result of the overlapped
> operation
>      {
>        //OK, process with the char received
>      }
>      else
>      {
>        // Error
>      }
>    }
>    // the character was received immediately
> }
>
> HTH
> Michel
> -- 
> ----------------------------------------
> Michel Leunen
> mailto:michel@leunen.com
> http://www.leunen.com/cbuilder/
> ----------------------------------------
>