TR
UE))
UE))
{ dwError=GetLastError();
if(dwError == ERROR_IO_INCOMPLETE)
continue;
}

}
else
{ dwLength=0;

ClearCommError(COMDEV(npGPSInfo),&dwErrorFlags,&ComStat);
}
}
}
return ( dwLength ) ;
}

BOOL NEAR WriteCommBlock(LPSTR lpByte,DWORD dwBytesToWrite)
{ BOOL fWriteStat;
DWORD dwBytesWritten;
DWORD dwErrorFlags;
DWORD dwError;
COMSTAT ComStat;

if (!npGPSInfo) return(FALSE);

fWriteStat=WriteFile(COMDEV(npGPSInfo),lpByte,dwBytesToWrite,
&dwBytesWritten,&WRITE_OS(npGPSInfo));

if (!fWriteStat)
{ if(GetLastError()==ERROR_IO_PENDING)
{ while(!GetOverlappedResult(COMDEV(npGPSInfo),
&WRITE_OS(npGPSInfo),&dwBytesWritten,TRUE))
{ dwError=GetLastError();
if(dwError == ERROR_IO_INCOMPLETE)
continue;
else
{
ClearCommError(COMDEV(npGPSInfo),&dwErrorFlags,&ComStat);
break;
}
}
}
else
{
{
ClearCommError(COMDEV(npGPSInfo),&dwErrorFlags,&ComStat);
return ( FALSE );
}
}
return ( TRUE ) ;

}

DWORD FAR PASCAL CommWatchProc(LPSTR)
{ DWORD dwEvtMask;
OVERLAPPED os;
int nLength;
BYTE abIn[1024];

memset(&os,0,sizeof(OVERLAPPED));

// create I/O event used for overlapped read

os.hEvent=CreateEvent(NULL,TRUE,FALSE,NULL);
if (os.hEvent==NULL)
{ MessageBox(NULL,"Failed to create event for thread!","GPS
Error!",MB_ICONEXCLAMATION|MB_OK);
return ( FALSE ) ;
}

if (!SetCommMask(COMDEV(npGPSInfo),EV_RXCHAR)) return (FALSE);

while (CONNECTED( npGPSInfo))
{ dwEvtMask=0 ;
WaitCommEvent(COMDEV(npGPSInfo),&dwEvtMask,NULL);

if ((dwEvtMask&EV_RXCHAR)==EV_RXCHAR)
{ do
{ if
(nLength=ReadCommBlock((LPSTR)abIn,1024))
{
//WriteCommBlock((LPSTR)abIn,nLength );
*(abIn+nLength)=0;

::SendMessage(hGPSWnd,CN_SEND,nLength,(LONG)(LPSTR)abIn);
}
}
while ((nLength>0)&&(CONNECTED( npGPSInfo)));
}
}
}

CloseHandle(os.hEvent);
THREADID(npGPSInfo)=0;
HTHREAD(npGPSInfo)=NULL;
return(TRUE);
}


就这些了，希望能对问这些问题的朋友有所帮助!

一般使用的顺序是：
CreateGPSInfo(被通知的窗口句柄，串口端口号1或2);
OpenConnection();//建立联结它会调用SetupConnection
DestroyGPSInfo();//解除联结它会调用CloseConnection

可以用ReadCommBlock/WriteCommBlock来读/写串口
CommWatchProc是监视串口的线程，由OpenConnection建立


当串口有数据来的时侯，它会通知''被通知的窗口句柄''的窗口数据传到的消息(自

定义的)
SendMessage(hGPSWnd,CN_SEND,nLength,(LONG)(LPSTR)abIn);

好了，文章结束了！希望能帮助你！