🚀 go-pugleaf

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
-- 
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Michel Leunen
mailto:michel@leunen.com
http://www.leunen.com/cbuilder/
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