串口编程初步

1.同步查询方式
        CreateFile( lpFileName,                                   //串口号                              %%%
                     dwDesiredAccess,                            //GENERIC_READ|GENERIC_WRITE
                     dwSharedMode,                               //0 不允许共享
                     lpSecurityAttributes,                        //NULL
                     dwCreationDisposition,                     //OPEN_EXISTING
                     dwFlagsAndAttributes,                     //FILE_ATTRIBUTE_NORMAL   %%%
                                                                          //FILE_FLAG_OVERLAPPED     %%%重叠I/O方式时使用
                     hTemplateFile)                                 //NULL

              SetupComm          //设置输入输出缓存大小

              GetCommState      //获得一DCB结构
  
              SetCommState

      ReadFile                                                                               TimeProc(hwnd,uMsg,idEvent,uElapse,lpTimerFunc)

     WriteFile                                                                                SetTimer
     
     CloseHandle                                                                           KillTimer
2.重叠I/O方式
     CreateThread
     
        ThreadProc

           CreateEvent
 
           WaitForSingleObject

           GetOverlappedResult

3.事件驱动方式
           
          SetCommMask
 
          建立事件线程CreateThread
     
        ThreadProc

             WaitCommEvent
             WaitForSingleObject

             ClearCommError