C语言串口通信助手代码

1、该程序全部由C写成没有C+更没用MFC完全是自娱自乐给需要的人一个参考#include stdafx.h#include #include resource.h#include MainDlg.h#include #include #include HANDLE hComm;/用于获取串口打开函数的返回值(句柄或错误值) OVERLAPPED m_ov;COMSTAT comstat;DWORD m_dwCommEvents;TCHAR cRecs200,cSends100; 接/收字符串发送字符串char j=0,*cCom; /接收用统计数据大小变量端口选择BOOL WINAPI Main

2、_Proc(HWND hWnd, UINT uMsg, WPARAM wParam,LPARAM lParam)switch(uMsg)HANDLE_MSG(hWnd, WM_INITDIALOG, Main_OnInitDialog);HANDLE_MSG(hWnd, WM_COMMAND, Main_OnCommand);HANDLE_MSG(hWnd,WM_CLOSE, Main_OnClose);return FALSE;/* 系统初始化函数 */BOOL Main_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAMlParam)HWND hw

3、ndCombo1=GetDlgItem(hwnd,IDC_COMBO1);ComboBox_InsertString(hwndCombo1,-1,TEXT(COM1);ComboBox_InsertString(hwndCombo1,-1,TEXT(COM2);ComboBox_InsertString(hwndCombo1,-1,TEXT(COM3);ComboBox_InsertString(hwndCombo1,-1,TEXT(COM4);ComboBox_InsertString(hwndCombo1,-1,TEXT(COM5);ComboBox_SetCurSel(hwndCombo

4、1,0);void CALLBACK TimerProc (HWND hwnd, UINT message, UINT iTimerID,DWORD dwTime);SetTimer(hwnd,1,1000,TimerProc);return TRUE;/* 监视串口错误时使用的函数 */boolProcessErrorMessage(char* ErrorText)char *Temp = new char200;LPVOID lpMsgBuf;FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |FORMAT_MESSAGE_FROM_SYSTEM,N

5、ULL,GetLastError(),MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), / Defaultlanguage(LPTSTR) &lpMsgBuf,0,NULL);sprintf(Temp, WARNING: %s Failed with the following error:n%snPort: %dn, (char*)ErrorText, lpMsgBuf, com2);MessageBox(NULL, Temp, Application Error, MB_ICONSTOP);LocalFree(lpMsgBuf);delete Temp;

6、return true;boolopenport(char *portname)/ 打开串口hComm = CreateFile(portname, /串 口号 “ comT “ cc调用方法：bool open;open=openport(com2);GENERIC_READ | GENERIC_WRIT允许读写0, /通讯设备必须以独占方式打开0, / 无安全属性OPEN_EXISTING,通讯设备已存在FILE_FLAG_OVERLAPPED异步 I/O0); /通讯设备不能用模板打开if (hComm = INVALID_HANDLE_VALUE如/果被占用或是没有打开时返回的 是这个

7、错误代码CloseHandle(hComm);return FALSE;elsereturn true;boolsetupdcb(intrate_arg)/ 设置 port 的属性DCB dcb;int rate= rate_arg;memset(&dcb,0,sizeof(dcb);if(!GetCommState(hComm,&dcb)获取当前 DCB配置return FALSE;/ set DCB to configure the serial portdcb.DCBlength = sizeof(dcb);dcb.BaudRate = rate;dcb.Parity = NOPARIT

8、Y; 奇/ 偶校验值 04分别对应无校验、奇校验、偶校 验、校验置位、校验清零dcb.fParity = 0; /为 1的话激活奇偶校验检查dcb.StopBits = ONESTOPBIT停止位个数，02分别对应1位、1.5位、2位 停止位dcb.ByteSize = 8; /数据位数dcb.fOutxCtsFlow = 0;dcb.fOutxDsrFlow = 0;dcb.fDtrControl = DTR_CONTROL_DISABLE;dcb.fDsrSensitivity = 0;dcb.fRtsControl = RTS_CONTROL_DISABLE;dcb.fOutX = 0;

9、dcb.fInX = 0;dcb.fErrorChar = 0;dcb.fBinary = 1;dcb.fNull = 0;dcb.fAbortOnError = 0;dcb.wReserved = 0;dcb.XonLim = 2;dcb.XoffLim = 4;dcb.XonChar = 0x13;dcb.XoffChar = 0x19;dcb.EvtChar = 0;/ set DCBif(!SetCommState(hComm,&dcb)return false;elsereturn true;/* 串口读取相关时间设置 */boolsetuptimeout(DWORDReadInte

10、rval,DWORDReadTotalMultiplier,DWORDReadTotalconstant,DWORDW riteTotalMultiplier,DWORDWriteTotalconstant)COMMTIMEOUTS timeouts;timeouts.ReadIntervalTimeout=ReadInterval; / 读取两个字节间隔最大值 mS 如超过立即返回不再读取timeouts.ReadTotalTimeoutConstant=ReadTotalconstant; /如果同下面一个都 为 0 则无论是否读到数据都返回/ 可以毫秒为单位指定一个乘数，该乘数用来计算读

11、操作的总限时时间 timeouts.ReadTotalTimeoutMultiplier=ReadTotalMultiplier; / 以毫秒为单位指定一 个常数，用于计算读操作的总限时时间 0 表示不限时timeouts.WriteTotalTimeoutConstant=WriteTotalconstant;/ 写操作延时同上timeouts.WriteTotalTimeoutMultiplier=WriteTotalMultiplier;if(!SetCommTimeouts(hComm, &timeouts)return false;elsereturn true;intClearn(

12、) / 清除 buff 中的内容并返回 buff 中现有数据量的大小并读取错误 原因DWORD dwError = 0;DWORD BytesRead = 0;ClearCommError(hComm, &dwError, &comstat);return comstat.cbInQue; / 返回 buff 中数据量/* 串口数据接收读取函数 */void ReceiveChar()BOOL bRead = TRUE;BOOL bResult = TRUE;DWORD dwError = 0;DWORD BytesRead = 0;char i=0,n;char RXBuff;j=0;whi

13、le (i-n)n=i;Sleep(10);bResult = ClearCommError(hComm, &dwError, &comstat); i=(char)comstat.cbInQue;for (;i0;i-)if (bRead)bResult = ReadFile(hComm, / Handle to COMM port&RXBuff, / RX Buffer Pointer1, / Read one byte&BytesRead, / Stores number of bytes read&m_ov); / pointer to the m_ov structure/ prin

14、tf(%c,RXBuff);cRecsj+=(char)RXBuff;if (!bResult)switch (dwError = GetLastError()case ERROR_IO_PENDING:bRead = FALSE;break;default: break;elsebRead = TRUE; / close if (bRead)if (!bRead)bRead = TRUE;bResult = GetOverlappedResult(hComm, / Handle to COMM port&m_ov, / Overlapped structure&BytesRead, / St

15、ores number of bytes readTRUE); / Wait flagboolWriteChar(char* m_szWriteBuffer,DWORDm_nToSend) /写字符的函数BOOL bWrite = TRUE;BOOL bResult = TRUE;DWORD BytesSent = 0;HANDLE m_hWriteEvent;ResetEvent(m_hWriteEvent);if (bWrite)m_ov.Offset = 0;m_ov.OffsetHigh = 0;/ Clear bufferbResult = WriteFile(hComm, / Ha

16、ndle to COMM Portm_szWriteBuffer, / Pointer to message buffer in calling finctionm_nToSend, / Length of message to send&BytesSent, / Where to store the number of bytes sent&m_ov ); / Overlapped structureif (!bResult)DWORD dwError = GetLastError();switch (dwError)case ERROR_IO_PENDING:/ continue to G

17、etOverlappedResults()BytesSent = 0;bWrite = FALSE;break;default:/ all other error codesbreak; / end if(bWrite)if (!bWrite)bWrite = TRUE;bResult = GetOverlappedResult(hComm, / Handle to COMM port&m_ov, / Overlapped structure&BytesSent, / Stores number of bytes sentTRUE); / Wait flag/ deal with the er

18、ror codeif (!bResult)printf(GetOverlappedResults() in WriteFile(); / end if (!bWrite)/ Verify that the data size send equals what we tried to sendif (BytesSent != m_nToSend)printf(WARNING: WriteFile() error. Bytes Sent: %d; MessageLength: %dn, BytesSent, strlen(char*)m_szWriteBuffer);return true;/*w

19、indow 时间函数回调 */void CALLBACK TimerProc (HWND hwnd, UINT message, UINT iTimerID,DWORD dwTime)SYSTEMTIME time; /定/ 义机构体变量 timeGetLocalTime(&time); / 取系统时间以指针方式TCHAR strTime256; /程序只有一个作用wsprintf(strTime,%04d-%02d-%02d %02d:%02d:%02d,time.wYear, /就/ 是读 取系统时间time.wMonth,time.wDay,time.wHour,time.wMinute

20、,time.wSecond);/ 然后写进 strTimeSetDlgItemText(hwnd,IDC_TIME,strTime); /这/ 个字符串void Main_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINTcodeNotify)switch(id)case IDC_SEND:GetDlgItemText (hwnd,IDC_EDIT2,cSends,sizeof(cSends);un sig ned n二sizeof(cSe nds); n是通知串口将发送字节的长度char send100;wsprintf (send,%s,cSends);WriteChar(send,n-1);SetCommMask(hComm, EV_RXCHAR)监视串口是否接收有数据ReceiveChar(); /读取串口 sbuff 中数据cRecsj=0; / 将 cRecs转为字符串SetDlgItemText(hwnd,IDC_EDIT1,cRecs); break;/*case IDC_RECEIVE暂时未用采用直接