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发信人: jek (你的名字我的姓氏), 信区: Program
标题: 用Builder C++如何对串行口COM1或COM2进行读写操作
发信站: BBS 荔园晨风站 (Sat Jun 10 09:59:13 2000), 转信

用Builder C++如何对串行口COM1或COM2进行读写操作

一个通讯类（对串口的读写），可以不用做修改就用在程序中

TSerialPort.h

#ifndef __SERIALPORT_H__
#define __SERIALPORT_H__

#define WM_COMM_BREAK_DETECTED WM_USER+1 // A break was detected on input.
#define WM_COMM_CTS_DETECTED WM_USER+2 // The CTS (clear-to-sennd) signal
//changed state.
#define WM_COMM_DSR_DETECTED WM_USER+3 // The DSR (data-set-reaady) signal
// changed state.
#define WM_COMM_ERR_DETECTED WM_USER+4 // A line-status error ooccurre d.
//Line-status errors are CE_FRAME, CE_OVERRUN, and CE_RXPARITY.

#define WM_COMM_RING_DETECTED WM_USER+5 // A ring indicator was etec ted.
#define WM_COMM_RLSD_DETECTED WM_USER+6 // The RLSD (receive-lin -sig nal-
//detect) signal changed state.
#define WM_COMM_RXCHAR WM_USER+7 // A character w s received and pl aced in
//the input buffer.
#define WM_COMM_RXFLAG_DETECTED WM_USER+8 // The event character w s received
// and placed in the input buffer.
#define WM_COMM_TXEMPTY_DETECTED WM_USER+9 // The last character in the
//output buffer was sent.

class TSerialPort
{
public:
// contruction and destruction
TSerialPort();
virtual ~TSerialPort();

// port initialisation
BOOL InitPort(TForm* pPortOwner, UINT portnr = 1, UINT baud = 19200,
char parity = 'N', UINT databits = 8, UINT stopsbits = 1,
DWORD dwCom mEvents = EV_RXCHAR | EV_CTS, UINT nBufferSize = 512);

// start/stop comm watching
BOOL StartMonitoring();
BOOL RestartMonitoring();
BOOL StopMonitoring();

DWORD GetWriteBufferSize();
DWORD GetCommEvents();
DCB GetDCB();

void WriteToPort(char* string);

protected:
// protected memberfunctions
void ProcessErrorMessage(char* ErrorText);
static DWORD _stdcall CommThread(LPVOID pParam);
static void ReceiveChar(TSerialPort* port, COMSTAT comstat);
static void WriteChar(TSerialPort* port);

// thread
HANDLE m_HThread;

// synchronisation objects
CRITICAL_SECTION m_csCommunicationSync;
BOOL m_bThreadAlive;

// handles
HANDLE m_hShutdownEvent;
HANDLE m_hComm;
HANDLE m_hWriteEvent;

// Event array.
// One element is used for each event. There are two event handles for
//each port.
// A Write event and a receive character event which is located in the
//overlapped structure (m_ov.hEvent).
// There is a general shutdown when the port is closed.
HANDLE m_hEventArray[3];

// structures
OVERLAPPED m_ov;
COMMTIMEOUTS m_CommTimeouts;
DCB m_dcb;

// owner window
TForm* m_pOwner;

// misc
UINT m_nPortNr;
char* m_szWriteBuffer;
DWORD m_dwCommEvents;
DWORD m_nWriteBufferSize;
};

#endif __SERIALPORT_H__

TSerialPort.cpp

#include
#pragma hdrstop
#include "SerialPort.h"
#include
#include
#pragma package(smart_init)
//
// Constructor
//
TSerialPort::TSerialPort()
{
m_hComm = NULL;

// initialize overlapped structure members to zero
m_ov.Offset = 0;
m_ov.OffsetHigh = 0;

// create events
m_ov.hEvent = NULL;
m_hWriteEvent = NULL;
m_hShutdownEvent = NULL;

m_szWriteBuffer = NULL;

m_bThreadAlive = false;
}

//
// Delete dynamic memory
//
TSerialPort::~TSerialPort()
{
do
{
SetEvent(m_hShutdownEvent);
} while (m_bThreadAlive);

delete [] m_szWriteBuffer;
}

//
// Initialize the port. This can be port 1 to 4.
//
BOOL TSerialPort::InitPort(TForm* pPortOwner, // the o

--
※ 修改:·jek 於 Jun 10 10:00:33 修改本文·[FROM: 192.168.1.118]
※ 来源:·BBS 荔园晨风站 bbs.szu.edu.cn·[FROM: 192.168.1.118]

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