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From: hans@pine.circa.ufl.edu (Hans van Oostrom)
Newsgroups: comp.windows.ms.programmer
Subject: Re: Looking for a COM DLL (or DDE)
Message-ID: <29426@uflorida.cis.ufl.EDU>
Date: 28 Jun 91 00:25:27 GMT
References: <1991Jun26.204757.19291@cbnews.cb.att.com>
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Reply-To: hans@pine.circa.ufl.edu
Organization: University of Florida - Dept. of Anesthesiology
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In article <1991Jun26.204757.19291@cbnews.cb.att.com>, nak@cbnews.cb.att.com (neil.a.kirby) writes...
>I'm looking for a serial communications DLL.  I can't be the only one...
> 
>I would not mind coming across a DDE TSR that would manage the com port,
>but a DLL should do the job - I just don't want to write the thing.
> 

A TSR is definitly not the way to go.  Windows has interrupt driven 
serial I/O drivers build in, and they work pretty good if you don't do 
high baud rates.  The following functions are part of the SDK:

Communication Functions

Function	    Description
BuildCommDCB	    Fills a device control block with control codes.
ClearCommBreak	    Clears the communication break state from a 
		    communication device.
CloseComm	    Closes a communication device after transmitting the 
		    current buffer.
EscapeCommFunction  Directs a device to carry out an extended 
 		    function.
FlushComm	    Flushes characters from a communication device.
GetCommError	    Fills a buffer with the communication status.
GetCommEventMask    Retrieves, then clears, an event mask.
GetCommState	    Fills a buffer with a device control block.
OpenComm	    Opens a communication device.
ReadComm	    Reads the bytes from a communication device into a 
                    buffer.
SetCommBreak	    Sets a break state on the communication device.
SetCommEventMask    Retrieves and then sets an event mask on the 
		    communication device.
SetCommState	    Sets a communication device to the state specified by 
		    the device control block.
TransmitCommChar    Places a character at the head of the transmit queue.
UngetCommChar	    Specifies which character will be the next character 
		    to be read.
WriteComm	    Writes the bytes from a buffer to a communication 
		    device.

You can write a DLL to interface with some or all of these functions 
if you really need a DLL.  Otherwise just use them in your program.

Hans van Oostrom
PO Box J-254, JHMHC                 hans@ufpine                (BITNET)
Gainesville, FL  32601, USA         hans@pine.circa.ufl.edu    (INTERNET)
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