----用CreateFile来操作串口?----

Question

MSDN里有一例子，好象是叫TTY，是用API进行串口编程的。你可以看一看，它在
VCSamples的SDK子目录下。

Answer 1

HANDLE m_hPort;
DCB dcb;
m_hPort = CreateFile("COM1",GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_FLAG_OVERLAPPED,0);
if(m_hPort == INVALID_HANDLE_VALUE)
{
GetLastError(); CloseHandle(m_hPort);
}else
{
 GetCommState(m_hPort,&dcb);
//dcb settings
SetCommState(m_hPort,&dcb);
TransmitCommChar("a");
SetCommMask(....)
WaitCommEvent(....)//只能接收与SetCommMask参数对应的事件

Answer 2

想必"放不稳的鸡蛋 "收集的email很多了，怎么总是见你在问email，却收不到你的信呢？

Answer 3

hCom = CreateFile("com1",
              GENERIC_READ | GENERIC_WRITE,
  0,
  NULL,
                      OPEN_EXISTING,
  0,
                      //FILE_FLAG_OVERLAPPED,
  NULL);
     printf("comm1 handl is %d \n",hCom);
   
   pbuf = data;
   strcpy(data,"12341567890");
   len = 1;
   GetCommState(hCom, &dcb ) ; 
   dcb.BaudRate =9600; 
   dcb.ByteSize =8;
   dcb.Parity =EVENPARITY
  // dcb.Parity = SPACEPARITY;
  // dcb.Parity = MARKPARITY;
   dcb.fBinary = TRUE ;
   dcb.fParity = TRUE;
   SetCommState(hCom, &dcb ) ; //串口参数配置
/////////////////////////////////////////
 
   WriteFile(hCom,data,strlen(data),&len,0);
   
   printf("send len is %d \n",len);
  
 GetCommState(hCom, &dcb ) ; 
   dcb.BaudRate =9600; 
   dcb.ByteSize =8;
   dcb.Parity = ODDPARITY;
 
   dcb.fBinary = TRUE ;
   dcb.fParity = TRUE;
   SetCommState(hCom, &dcb ) ;
   strcpy(data,"A");
   WriteFile(hCom,data,strlen(data),&len,0);DWORD   mask; 
 mask =EV_RXCHAR|EV_DSR|EV_BREAK|EV_ERR;
SetCommMask(hCom,mask);WaitCommEvent(hCom,&mask,0);