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基于串口通信的高级语言控制程序的设计5、程序类的说明CSerialPortAPIDlg类：class CSerialPortAPIDlg : public CDialog / Construction public: CSerialPortAPIDlg(CWnd* pParent = NULL); / standard constructor / Dialog Data /AFX_DATA(CSerialPortAPIDlg) enum IDD = IDD_SERIALPORTAPI_DIALOG ; CString m_recv; /IDC_RECV_EDIT 控件对应的变量 CString m_send; /IDC_SEND_EDIT 控件对应的变量 /AFX_DATA / ClassWizard generated virtual function overrides /AFX_VIRTUAL(CSerialPortAPIDlg) protected: virtual void DoDataExchange(CDataExchange* pDX); / DDX/DDV support /AFX_VIRTUAL / Implementation protected: BOOL OpenSerialPort1(); HICON m_hIcon; / Generated message map functions /AFX_MSG(CSerialPortAPIDlg) virtual BOOL OnInitDialog(); afx_msg void OnSysCommand(UINT nID, LPARAM lParam); afx_msg void OnPaint(); afx_msg HCURSOR OnQueryDragIcon(); afx_msg void OnClearButton(); afx_msg void OnSendButton(); afx_msg void OnRecvData(WPARAM wParam, LPARAM lParam); /AFX_MSG DECLARE_MESSAGE_MAP() ;6、功能模块分析6.1.打开串口：HANDLE CreateFile ( LPCTSTR lpFileName, /将要打开的串口逻辑名，如COM1 或COM2 DWORD dwAccess, /指定串口访问的类型，可以是读取、写入或两者并列 DWORD dwShareMode, /指定共享属性，由于串口不能共享,该参数必须置为0 LPSECURITY_ATTRIBUTES lpsa, /引用安全性属性结构，缺省值为NULL DWORD dwCreate, /创建标志，对串口操作该参数必须置为OPEN EXISTING DWORD dwAttrsAndFlags, /属性描述，用于指定该串口是否可进行异步操作， /FILE_FLAG_OVERLAPPED：可使用异步的I/O HANDLE hTemplateFile /指向模板文件的句柄，对串口而言该参数必须置为NULL );：void CSerialPortAPIDlg:OnButton6() / TODO: Add your control notification handler code heredakaichuankou=1-dakaichuankou;if(dakaichuankou=1)GetDlgItem(IDC_BUTTON6)-SetWindowText(关闭串口);CString temp;CString botelv;CloseHandle(hCom);(CComboBox *)GetDlgItem(IDC_chuankou)-GetWindowText(temp);hCom=CreateFile(temp, GENERIC_READ|GENERIC_WRITE, 0,NULL , OPEN_EXISTING, 0, NULL); DCB dcb; GetCommState (hCom, &dcb);(CComboBox *)GetDlgItem(IDC_botelv)-GetWindowText(botelv);short Botelv=atoi(botelv);dcb.BaudRate=Botelv;/波特率：9600，其他：不变 SetCommState (hCom, &dcb); PurgeComm(hCom, PURGE_TXCLEAR); elseGetDlgItem(IDC_BUTTON6)-SetWindowText(打开串口);CloseHandle(hCom);6.2.配置串口 typedef struct _DCB / dcb DWORD DCBlength; / sizeof(DCB) DWORD BaudRate; / current baud rate DWORD fBinary: 1; / binary mode, no EOF check DWORD fParity: 1; / enable parity checking DWORD fOutxCtsFlow:1; / CTS output flow control DWORD fOutxDsrFlow:1; / DSR output flow control DWORD fDtrControl:2; / DTR flow control type DWORD fDsrSensitivity:1; / DSR sensitivity DWORD fTXContinueOnXoff:1; / XOFF continues Tx DWORD fOutX: 1; / XON/XOFF out flow control DWORD fInX: 1; / XON/XOFF in flow control DWORD fErrorChar: 1; / enable error replacement DWORD fNull: 1; / enable null stripping DWORD fRtsControl:2; / RTS flow control DWORD fAbortOnError:1; / abort reads/writes on error DWORD fDummy2:17; / reserved WORD wReserved; / not currently used WORD XonLim; / transmit XON threshold WORD XoffLim; / transmit XOFF threshold BYTE ByteSize; / number of bits/byte, 4-8 BYTE Parity; / 0-4=no,odd,even,mark,space BYTE StopBits; / 0,1,2 = 1, 1.5, 2 char XonChar; / Tx and Rx XON character char XoffChar; / Tx and Rx XOFF character char ErrorChar; / error replacement character char EofChar; / end of input character char EvtChar; / received event character WORD wReserved1; / reserved; do not use DCB; BOOL SetupComm( HANDLE hFile, / handle to communications device DWORD dwInQueue, / size of input buffer DWORD dwOutQueue / size of output buffer );6.3.超时设置 typedef struct _COMMTIMEOUTS DWORD ReadIntervalTimeout; /定义两个字符到达的最大时间间隔，单位：毫秒 /当读取完一个字符后，超过了ReadIntervalTimeout，仍未读取到下一个字符，就会 /发生超时 DWORD ReadTotalTimeoutMultiplier; DWORD ReadTotalTimeoutConstant; /其中各时间所满足的关系如下： /ReadTotalTimeout = ReadTotalTimeOutMultiplier* BytesToRead + ReadTotalTimeoutConstant DWORD WriteTotalTimeoutMultiplier; DWORD WriteTotalTimeoutConstant; COMMTIMEOUTS, *LPCOMMTIMEOUTS; BOOL SetCommTimeouts( HANDLE hFile, / handle to communications device LPCOMMTIMEOUTS lpCommTimeouts / pointer to comm time-out structure );6.4.事件设置 BOOL SetCommMask( HANDLE hFile, /标识通信端口的句柄 DWORD dwEvtMask /能够使能的通信事件 ); BOOL GetCommMask( HANDLE hFile, /标识通信端口的句柄 LPDWORD lpEvtMask / address of variable to get event mask ); BOOL WaitCommEvent( HANDLE hFile, /标识通信端口的句柄 LPDWORD lpEvtMask, / address of variable for event that occurred LPOVERLAPPED lpOverlapped, / address of overlapped structure ); 6.5.读串口 BOOL ReadFile( HANDLE hFile, / handle of file to read LPVOID lpBuffer, / pointer to buffer that receives data DWORD nNumberOfBytesToRead, / number of bytes to read LPDWORD lpNumberOfBytesRead, / pointer to number of bytes read LPOVERLAPPED lpOverlapped / pointer to structure for overlapped I/O );6.6.写串口 BOOL WriteFile( HANDLE hFile, / handle to file to write to LPCVOID lpBuffer, / pointer to data to write to file DWORD nNumberOfBytesToWrite, / number of bytes to write LPDWORD lpNumberOfBytesWritten, / pointer to number of bytes written LPOVERLAPPED lpOverlapped / pointer to structure for overlapped I/O ); 6.7.关闭串口 BOOL CloseHandle( HANDLE hObject / handle to object to close );6.8.改变波特率void CSerialPortAPIDlg:OnEditchangebotelv() / TODO: Add your control notification handler code here6.9.发送数据void CSerialPortAPIDlg:OnSendButton()/发送数据 / TODO: Add your control notification handler code hereUpdateData(true); DWORD wCount = 0; WriteFile(hCom, m_send, m_send.GetLength(), &wCount, NULL); 6.10.清除发送区void CSerialPortAPIDlg:OnClearSendButton()/清除发送区 / TODO: Add your control notification handler code herem_send = ; UpdateData(false); 6.11.接受数据void CSerialPortAPIDlg:OnReceiveButton()/接收数据 / TODO: Add your control notification handler code here/char i=0;/char str20;/memset(str,0,20);/DWORD doe;COMSTAT coms;/ClearCommError(hCom,&doe,&cons);if(coms.cbInQue0)char i