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SerialPort.h
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/*
** FILENAME CSerialPort.h
**
** PURPOSE This class can read, write and watch one serial port.
** It sends messages to its owner when something happends on the port
** The class creates a thread for reading and writing so the main
** program is not blocked.
**
** CREATION DATE 15-09-1997
** LAST MODIFICATION 12-11-1997
**
** AUTHOR Remon Spekreijse
**
**
************************************************************************************
** author: mrlong date:2007-12-25
**
** 改进
** 1) 增加 ClosePort
** 2) 增加 WriteToPort 两个方法
** 3) 增加 SendData 与 RecvData 方法
**************************************************************************************
***************************************************************************************
** author：liquanhai date:2011-11-06
**
** 改进
** 1) 增加 ClosePort 中交出控制权，防止死锁问题
** 2) 增加 ReceiveChar 中防止线程死锁
**************************************************************************************
***************************************************************************************
** author：viruscamp date:2013-12-04
**
** 改进
** 1) 增加 IsOpen 判断是否打开
** 2) 修正 InitPort 中 parity Odd Even 参数取值错误
** 3) 修改 InitPort 中 portnr 取值范围，portnr>9 时特殊处理
** 4) 取消对 MFC 的依赖，使用 HWND 替代 CWnd，使用 win32 thread 函数而不是 MFC 的
** 5) 增加用户消息编号自定义，方法来自 CnComm
***************************************************************************************
***************************************************************************************
** author: itas109 date:2014-01-10
** Blog：blog.csdn.net/itas109
**
** 改进
** 1) 解决COM10以上端口无法显示的问题
** 2) 扩展可选择端口，最大值MaxSerialPortNum可以自定义
** 3) 添加QueryKey()和Hkey2ComboBox两个方法，用于自动查询当前有效的串口号。
**
*/
#ifndef __SERIALPORT_H__
#define __SERIALPORT_H__
#ifndef WM_COMM_MSG_BASE
#define WM_COMM_MSG_BASE WM_USER + 617 //!< 消息编号的基点
#endif
#define WM_COMM_BREAK_DETECTED WM_COMM_MSG_BASE + 1 // A break was detected on input.
#define WM_COMM_CTS_DETECTED WM_COMM_MSG_BASE + 2 // The CTS (clear-to-send) signal changed state.
#define WM_COMM_DSR_DETECTED WM_COMM_MSG_BASE + 3 // The DSR (data-set-ready) signal changed state.
#define WM_COMM_ERR_DETECTED WM_COMM_MSG_BASE + 4 // A line-status error occurred. Line-status errors are CE_FRAME, CE_OVERRUN, and CE_RXPARITY.
#define WM_COMM_RING_DETECTED WM_COMM_MSG_BASE + 5 // A ring indicator was detected.
#define WM_COMM_RLSD_DETECTED WM_COMM_MSG_BASE + 6 // The RLSD (receive-line-signal-detect) signal changed state.
#define WM_COMM_RXCHAR WM_COMM_MSG_BASE + 7 // A character was received and placed in the input buffer.
#define WM_COMM_RXFLAG_DETECTED WM_COMM_MSG_BASE + 8 // The event character was received and placed in the input buffer.
#define WM_COMM_TXEMPTY_DETECTED WM_COMM_MSG_BASE + 9 // The last character in the output buffer was sent.
#define MaxSerialPortNum 20 ///有效的串口总个数，不是串口的号 //add by itas109 2014-01-09
class CSerialPort
{
public:
// contruction and destruction
CSerialPort();
virtual ~CSerialPort();
// port initialisation
BOOL InitPort(HWND pPortOwner, UINT portnr = 1, UINT baud = 19200,
char parity = 'N', UINT databits = 8, UINT stopsbits = 1,
DWORD dwCommEvents = EV_RXCHAR | EV_CTS, UINT nBufferSize = 512,
DWORD ReadIntervalTimeout = 1000,
DWORD ReadTotalTimeoutMultiplier = 1000,
DWORD ReadTotalTimeoutConstant = 1000,
DWORD WriteTotalTimeoutMultiplier = 1000,
DWORD WriteTotalTimeoutConstant = 1000);
// start/stop comm watching
///控制串口监视线程
BOOL StartMonitoring();//开始监听
BOOL RestartMonitoring();//重新监听
BOOL StopMonitoring();//停止监听
DWORD GetWriteBufferSize();///获取写缓冲大小
DWORD GetCommEvents();///获取事件
DCB GetDCB();///获取DCB
///写数据到串口
void WriteToPort(char* string);
void WriteToPort(char* string,int n); // add by mrlong 2007-12-25
void WriteToPort(LPCTSTR string); // add by mrlong 2007-12-25
void WriteToPort(LPCTSTR string,int n);//add by mrlong 2007-12-2
void WriteToPort(BYTE* Buffer, int n);// add by mrlong
void ClosePort(); // add by mrlong 2007-12-2
BOOL IsOpen();
void SendData(LPCTSTR lpszData, const int nLength); //串口发送函数 by mrlong 2008-2-15
BOOL RecvData(LPTSTR lpszData, const int nSize); //串口接收函数 by mrlong 2008-2-15
void QueryKey(HKEY hKey);///查询注册表的串口号，将值存于数组中
void Hkey2ComboBox(CComboBox& m_PortNO);///将QueryKey查询到的串口号添加到CComboBox控件中
protected:
// protected memberfunctions
void ProcessErrorMessage(char* ErrorText);///错误处理
static DWORD WINAPI CommThread(LPVOID pParam);///线程函数
static void ReceiveChar(CSerialPort* port);
static void WriteChar(CSerialPort* port);
// thread
//CWinThread* m_Thread;
HANDLE m_Thread;
BOOL m_bIsSuspened;///thread监视线程是否挂起
// synchronisation objects
CRITICAL_SECTION m_csCommunicationSync;///临界资源
BOOL m_bThreadAlive;///监视线程运行标志
// handles
HANDLE m_hShutdownEvent; //stop发生的事件
HANDLE m_hComm; // 串口句柄
HANDLE m_hWriteEvent; // write
// 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.
///事件数组，包括一个写事件，接收事件，关闭事件
///一个元素用于一个事件。有两个事件线程处理端口。
///写事件和接收字符事件位于overlapped结构体（m_ov.hEvent）中
///当端口关闭时，有一个通用的关闭。
HANDLE m_hEventArray[3];
// structures
OVERLAPPED m_ov;///异步I/O
COMMTIMEOUTS m_CommTimeouts;///超时设置
DCB m_dcb;///设备控制块
// owner window
//CWnd* m_pOwner;
HWND m_pOwner;
// misc
UINT m_nPortNr; //?????
char* m_szWriteBuffer;///写缓冲区
DWORD m_dwCommEvents;
DWORD m_nWriteBufferSize;///写缓冲大小
int m_nWriteSize;//写入字节数 //add by mrlong 2007-12-25
};
#endif __SERIALPORT_H__