tapi32port.cpp

DOS下采用中断接收数据的串口通讯的例子,很难找到的好东西!

//
//  Tapi32Port.cpp
//
//  Source code from:
//
//  Serial Communications: A C++ Developer's Guide, 2nd 
//  Edition by Mark Nelson, IDG Books, 1999
//
//  Please see the book for information on usage.
//
// This file contains the complete implementation of 
// class Tapi32Port,This class is derived from Win32Port, 
// and it uses nearly every bit of code from the base class, 
// with one notable exception. The normal constructor for 
// Win32Port expects to open a port by name. When we are 
// using TAPI, we don't get to open the port by name. Instead, 
// TAPI gets the port all set up and ready to use, then hands 
// us a handle to the port. The constructor defined for this
// class takes that handle and inserts it into the Win32 
// object, without trying to open a port with a call to
// CreateFile() which is inappropriate for TAPI.
//

#include <process.h>
#include "Tapi32Port.h"

Tapi32Port::Tapi32Port( HANDLE handle )
: Win32Port()
{
//
// Win32Port has to share the debug output with the parent class.
// To determine where our first line starts, we call the
// FormatDebugOutput() function from our parent class.
//
    first_debug_output_line = RS232::FormatDebugOutput();
    debug_line_count = FormatDebugOutput();
    port_name = (RS232PortName) -1;
    m_hPort = handle;
    m_dwErrors = 0;             //Clear cumulative line status errors
    m_iBreakDuration = 0;      //No break in progress, initialize to 0
    SetLastError( 0 );         //Clear any Win32 error from this thread
    read_settings();           //Read and save current port settings 
    saved_settings = settings; //Only needed because base class dumps 
                               //the saved settings in debug output
    //Init timeous to ensure our overlapped reads work
    COMMTIMEOUTS timeouts = { 0x01, 0, 0, 0, 0 };
    SetCommTimeouts( m_hPort, &timeouts );
    SetupComm( m_hPort, 500, 500 ); //set buffer sizes
    error_status = RS232_SUCCESS;     //clear current class error

    //
    // Since the port opened properly, we're ready to start the
    // input and output threads. Before they start we create the
    // five Win32 events that will be used to pass requests to
    // the threads. Note that the only argument passed to the
    // thread initialization is a pointer to this. The thread
    // needs that to find all of the data in the Win32Port 
    // object that it will be manipulating.
    //
    m_hKillInputThreadEvent = CreateEvent( NULL, FALSE, FALSE, NULL );
    m_hKillOutputThreadEvent = CreateEvent( NULL, FALSE, FALSE, NULL );
    m_hWriteRequestEvent = CreateEvent( NULL, FALSE, FALSE, NULL );
    m_hReadRequestEvent = CreateEvent( NULL, FALSE, FALSE, NULL );
    m_hBreakRequestEvent = CreateEvent( NULL, FALSE, FALSE, NULL );
    m_hInputThread = _beginthread( InputThread, 0, (void *) this );
    m_hOutputThread = _beginthread( OutputThread, 0, (void *) this );
}
//EOF Tapi32Port.cpp