问一下，我做串口通讯用类CMSCOMM和CreateFile()、WriteFile、ReadFile有什么区别？

Question

CMSCOMM m_ComPort;
m_ComPort.SetOpenPort(1);
m_ComPort.SetOutput();

Answer 1

http://roaringwind.best.163.com/

Answer 2

HANDLE    hCom,hCom2;
//HANDLE    hCommWatchThread;
DCB       dcb,dcb2;
char *   pbuf;
char  data[1024],recv_data[1024];
DWORD   len,send_len,error_code; hCom = CreateFile("com2",
              GENERIC_READ | GENERIC_WRITE,
  0,
  NULL,
                      OPEN_EXISTING,
  0,
                      //FILE_FLAG_OVERLAPPED,
  NULL);
     printf("comm2 handl is %d \n",hCom);
   
   pbuf = data;
   len = 1;
   GetCommState(hCom, &dcb ) ; 
   dcb.BaudRate =9600; 
   dcb.ByteSize =8;
  dcb.Parity = EVENPARITY;   dcb.fBinary = TRUE ;
   dcb.fParity = TRUE;
   SetCommState(hCom, &dcb ) ; //串口参数配置  strcpy(data,"start_0987654321000000000000000999888_END");
  WriteFile(hCom,data,strlen(data),&len,0);
...............
     memset(data,0,sizeof(data));
ReadFile(hCom2,data,32,&len,0); 

Answer 3

HANDLE    hCom,hCom2;
//HANDLE    hCommWatchThread;
DCB       dcb,dcb2;
char *   pbuf;
char  data[1024],recv_data[1024];
DWORD   len,send_len,error_code; hCom = CreateFile("com2",
              GENERIC_READ | GENERIC_WRITE,
  0,
  NULL,
                      OPEN_EXISTING,
  0,
                      //FILE_FLAG_OVERLAPPED,
  NULL);
     printf("comm2 handl is %d \n",hCom);
   
   pbuf = data;
   len = 1;
   GetCommState(hCom, &dcb ) ; 
   dcb.BaudRate =9600; 
   dcb.ByteSize =8;
  dcb.Parity = EVENPARITY;   dcb.fBinary = TRUE ;
   dcb.fParity = TRUE;
   SetCommState(hCom, &dcb ) ; //串口参数配置  strcpy(data,"start_0987654321000000000000000999888_END");
  WriteFile(hCom,data,strlen(data),&len,0);
...............
     memset(data,0,sizeof(data));
ReadFile(hCom2,data,32,&len,0); 

Answer 4

createfile的函数说明：
http://216.26.161.91/vbapi/ref/c/createfile.html