📄 在vc++6_0中用win32 api实现串行通信-软件-vc-天极yesky.htm
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)<BR> {<BR> dwEvtMask = 0 ;<BR> WaitCommEvent( pCom->m_hCom,
&dwEvtMask, NULL );<BR> if ((dwEvtMask & EV_RXCHAR) ==
EV_RXCHAR)<BR> {<BR> if ((nLength = ReadCommBlock( *pCom, (LPSTR) buf,
255 )))<BR> {<BR> //WriteTTYBlock( hTTYWnd, (LPSTR) abIn, nLength )
;<BR> buf[nLength]='\0';<BR> AfxMessageBox(buf);<BR> }<BR> }<BR> }<BR> CloseHandle(
os.hEvent ) ;<BR> return( TRUE ) ;<BR>} // end of
CommWatchProc()<BR><BR>int ReadCommBlock(CComStatus& comDev,LPSTR
lpszBlock, int nMaxLength )<BR>{<BR> BOOL fReadStat ;<BR> COMSTAT ComStat
;<BR> DWORD dwErrorFlags;<BR> DWORD dwLength;<BR> DWORD
dwError;<BR><BR> char szError[ 10 ] ;<BR><BR> // only try to read number
of bytes in queue<BR><BR> ClearCommError( comDev.m_hCom,
&dwErrorFlags, &ComStat ) ;<BR> dwLength = min( (DWORD)
nMaxLength, ComStat.cbInQue ) ;<BR><BR> if (dwLength >
0)<BR> {<BR> fReadStat = ReadFile( comDev.m_hCom, lpszBlock,dwLength,
&dwLength, &(comDev.m_rdos) ) ;<BR> if
(!fReadStat)<BR> {<BR> if (GetLastError() ==
ERROR_IO_PENDING)<BR> {<BR> OutputDebugString("\n\rIO
Pending");<BR> while(!GetOverlappedResult( comDev.m_hCom
,&(comDev.m_rdos), &dwLength, TRUE ))<BR> {<BR> dwError =
GetLastError();<BR> if(dwError == ERROR_IO_INCOMPLETE)<BR> //
normal result if not
finished<BR> continue;<BR> else<BR> {<BR> // an error
occurred, try to recover<BR> wsprintf( szError, "<CE-%u>",
dwError ) ;<BR> ClearCommError( comDev.m_hCom , &dwErrorFlags,
&ComStat )
;<BR> break;<BR> }<BR> }<BR> }<BR> else<BR> {<BR> //
some other error occurred<BR> dwLength = 0 ;<BR> ClearCommError(
comDev.m_hCom , &dwErrorFlags, &ComStat )
;<BR> }<BR> }<BR> }<BR> return ( dwLength ) ;<BR>} // end of
ReadCommBlock()<BR><BR>int ReadCommBlockEx(CComStatus& comDev,LPSTR
lpszBlock, int nMaxLength,DWORD dwTimeOut)<BR>{<BR> LPSTR
lpOffset=lpszBlock;<BR> int nReadCount = 0;<BR> char chBuf;<BR> //time_t
beginTime,endTime;<BR> if(!comDev.m_hCom)<BR> return 0;<BR> if(dwTimeOut
<= 0)<BR> return 0;<BR> MSG msg;<BR> //time(&beginTime);<BR> DWORD
dwLastTick,dwNowTick,dwGoneTime;<BR> dwGoneTime = 0;<BR> dwLastTick =
GetTickCount();<BR> dwNowTick = dwLastTick;<BR> // double
diftime;<BR> do<BR> {<BR> if(PeekMessage(&msg,NULL,0,0,PM_REMOVE))<BR> {<BR> ::TranslateMessage(&msg);<BR> ::DispatchMessage(&msg);<BR> }<BR> if(ReadCommBlock(comDev,&chBuf,1)
> 0)<BR> {<BR> //TRACE("----get a char----\n");<BR> *lpOffset =
chBuf;<BR> lpOffset ++;<BR> nReadCount ++;<BR> }<BR> dwNowTick =
GetTickCount();<BR> if(dwNowTick < dwLastTick)<BR> {<BR> dwLastTick
= dwNowTick;<BR> }<BR><BR> dwGoneTime = dwNowTick -
dwLastTick;<BR><BR> //TRACE("gon time =
%lu\n",dwGoneTime);<BR><BR> }while((nReadCount < nMaxLength) &&
(dwGoneTime < dwTimeOut));<BR> return (nReadCount);<BR>}//end
ReadCommBlockEx<BR><BR>BOOL WriteCommBlock( CComStatus& comDev, LPSTR
lpByte , DWORD dwBytesToWrite)<BR>{<BR> BOOL fWriteStat ;<BR> DWORD
dwBytesWritten ;<BR> DWORD dwErrorFlags;<BR> DWORD dwError;<BR> DWORD
dwBytesSent=0;<BR> COMSTAT ComStat;<BR><BR> char szError[ 128 ]
;<BR><BR> fWriteStat = WriteFile( comDev.m_hCom , lpByte,
dwBytesToWrite,&dwBytesWritten, &( comDev.m_wtos) ) ;<BR> if
(!fWriteStat)<BR> {<BR> if(GetLastError() ==
ERROR_IO_PENDING)<BR> {<BR> while(!GetOverlappedResult(
comDev.m_hCom,&(comDev.m_wtos), &dwBytesWritten, TRUE
))<BR> {<BR> dwError = GetLastError();<BR> if(dwError ==
ERROR_IO_INCOMPLETE)<BR> {<BR> // normal result if not
finished<BR> dwBytesSent +=
dwBytesWritten;<BR> continue;<BR> }<BR> else<BR> {<BR> //
an error occurred, try to recover<BR> wsprintf( szError,
"<CE-%u>", dwError ) ;<BR> ClearCommError( comDev.m_hCom,
&dwErrorFlags, &ComStat )
;<BR> break;<BR> }<BR> }<BR> dwBytesSent +=
dwBytesWritten;<BR> if( dwBytesSent != dwBytesToWrite
)<BR> wsprintf(szError,"\nProbable Write Timeout: Total of %ld bytes
sent", dwBytesSent);<BR> else<BR> wsprintf(szError,"\n%ld bytes
written",
dwBytesSent);<BR> OutputDebugString(szError);<BR> }<BR> else<BR> {<BR> //
some other error occurred<BR> ClearCommError( comDev.m_hCom,
&dwErrorFlags, &ComStat ) ;<BR> return ( FALSE
);<BR> }<BR> }<BR> return ( TRUE ) ;<BR>} // end of
WriteCommBlock()</TD></TR></TBODY></TABLE><BR> <B>四、小结
</B><BR><BR> 以上给出了用Win32 API设计串行通信的基本思路，在实际应用中，我们可以利用Win32 API设计出满足各种需要的串行通信程序。
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