程序分为两个部分。
/* MySerialPort.h
封装了串口通讯的windows API。
支持异步操作串口。
*/
#pragma once
#include <windows.h>
namespace jeff_class
{
class CMySerialPort
{
public:
CMySerialPort();
习以为常 ~CMySerialPort();
BOOL Open ( int nPort = 2, int nBaud = 9600 );
BOOL Clo ( void华科校长 );
int ReadData ( void *, int );
int SendData ( const char *, int );
int ReadDataWaiting ( void ); // 查询缓冲区内是否有未读取的数据
BOOL IsOpened ( void ) {
return ( m_bOpened );
}
protected:
BOOL WriteCommByte ( unsigned char ); // 内部实现，向串口写数据
HANDLE m_hIDComDev;
OVERLAPPED m_OverlappedRead, m_OverlappedWrite;
BOOL m_bOpened;
};
}
/ ****MySerialPort.cpp***********/
#include "MySerialPort.h"
#include <tchar.h>
死亡教育// 不使用读超时
#define TIMEOUT_READ_INTERVAL 0xFFFFFFFF
#define TIMEOUT_READ_TOTAL_MULTIPLIER 0
#define TIMEOUT_READ_TOTAL_CONSTANT 0
// 写超时为秒
#define TIMEOUT_WRITE_TOTAL_MULTIPLIER 0
#define TIMEOUT_WRITE_TOTAL_CONSTANT 5000如何清理电脑缓存
// 推荐的输入/输出缓冲区（注意：实际值由系统设置）
#define BUFFER_INPUT_RECOMMEND 10000
#define BUFFER_OUTPUT_RECOMMEND 10000
// 异步读取/写入操作时等待事件的超时时间
#define TIMEOUT_READCOMM_EVENT 4000
#define TIMEOUT_WRITECOMM_EVENT 2000
// 一些通讯协议使用的宏
#define FC_DTRDSR 0x01
#define FC_RTSCTS 0x02
#define FC_XONXOFF 0x04
#define ASCII_BEL 0x07
#define ASCII_BS 0x08
#define ASCII_LF 0x0A
#define ASCII_CR 0x0D
#define ASCII_XON 0x11
#define ASCII_XOFF 0x13
jeff_class::CMySerialPort::CMySerialPort()
{
memt ( &m_OverlappedRead, 0, sizeof ( OVERLAPPED ) );
memt ( &m_OverlappedWrite, 0, sizeof ( OVERLAPPED ) );
m_hIDComDev = NULL;
m_bOpened = FALSE;
}
jeff_class::CMySerialPort::~CMySerialPort()
{
Clo();
}
// 打开串口
BOOL jeff_class::CMySerialPort::Open ( int nPort, int nBaud )
保安年终总结{
if ( m_bOpened )
return TRUE;
TCHAR szPort[50];
TCHAR szComParams[50];
DCB dcb;
wsprintf ( szPort, _T ( "COM%d" ), nPort );
国家就业政策 // API：建立文件，Windows中将串口设备当做文件对待
m_hIDComDev = CreateFile (
szPort,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, // 异步读写
NULL
);
if ( m_hIDComDev == NULL ) return ( FALSE );
memt ( &m_OverlappedRead, 0, sizeof有趣的课余生活 ( OVERLAPPED ) );
memt ( &m_OverlappedWrite, 0, sizeof ( OVERLAPPED ) );
// 设置超时
COMMTIMEOUTS CommTimeOuts;
CommTimeOuts.ReadIntervalTimeout = TIMEOUT_READ_INTERVAL;
CommTimeOuts.ReadTotalTimeoutMultiplier = TIMEOUT_READ_TOTAL_MULTIPLIER;
CommTimeOuts.ReadTotalTimeoutConstant = TIMEOUT_READ_TOTAL_CONSTANT;
CommTimeOuts.WriteTotalTimeoutMultiplier= TIMEOUT_WRITE_TOTAL_MULTIPLIER;
CommTimeOuts.WriteTotalTimeoutConstant = TIMEOUT_WRITE_TOTAL_CONSTANT;
SetCommTimeouts ( m_hIDComDev, &CommTimeOuts );
wsprintf ( szComParams, _T ( "COM%d:%d,n,8,1" ), nPort, nBaud );
// 设置异步读取/写入监视事件
m_OverlappedRead.hEvent = CreateEvent ( NULL, TRUE, FALSE, NULL );
m_OverlappedWrite.hEvent = CreateEvent ( NULL, TRUE, FALSE, NULL );
// 读取/设置串口设备参数
dcb.DCBlength = sizeof ( DCB );
GetCommState ( m_hIDComDev, &dcb );
dcb.BaudRate = nBaud;
dcb.ByteSize = 8;
unsigned char ucSet;
ucSet = ( unsigned char ) ( ( FC_RTSCTS & FC_DTRDSR ) != 0 );
ucSet = ( unsigned char ) ( ( FC_RTSCTS & FC_RTSCTS ) != 0 );
ucSet = ( unsigned char ) ( ( FC_RTSCTS & FC_XONXOFF ) != 0 );
if ( !SetCommState ( m_hIDComDev, &dcb ) ||
!SetupComm ( m_hIDComDev, BUFFER_INPUT_RECOMMEND, BUFFER_OUTPUT_RECOMMEND ) ||
m_OverlappedRead.hEvent == NULL ||
m_OverlappedWrite.hEvent == NULL ) {
DWORD dwError = GetLastError();
if ( m_OverlappedRead.hEvent != NULL ) CloHandle ( m_OverlappedRead.hEvent );
if ( m_OverlappedWrite.hEvent != NULL ) CloHandle ( m_OverlappedWrite.hEvent );
CloHandle ( m_hIDComDev );
return ( FALSE );
}
m_bOpened = TRUE;
return ( m_bOpened );
}
// 关闭串口
BOOL jeff_class::CMySerialPort::Clo ( void )
{
逍遥丸的功效if ( !m_bOpened || m_hIDComDev == NULL ) return ( TRUE );
if ( m_OverlappedRead.hEvent != NULL ) CloHandle ( m_OverlappedRead.hEvent );
