lc_bcb_93.txt

c++ builder 的一些txt文档

用C++Builder如何对串行口COM1或COM2进行读写操作
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) sig 
  nal changed state. 
  #define WM_COMM_DSR_DETECTED WM_USER+3 // The DSR (data-set-reaady) si 
  gnal 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 
  th 
  e 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 fo 
  r each port. 
  // A Write event and a receive character event which is located in th 
  e 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