EOF reading in the buffer

Hi:

If I want the program to know whether it is the end of data in the input buffer in the serial port. So I do:

Code:

---

DCB dcb={0};

if(!GetCommState(hCom1, &dcb))  //get default dcb settings
  printf ("GetCommState is failed\n");

dcb.EofChar = '3'; //want character '3' to indicate the end of   
                              //the data in the input buffer

if(!SetCommState(hCom1,&dcb)) //re-set the dcb
{
    printf("%d\n",GetLastError());
    printf("SetCommState is failed\n");
}

---

but it didn't work, even if the string in the input buffer is, for example {'1','2','3','4'},

but it still read the whole string, I think character '4' should be read at least. What's going on with this?? :( Thank you.

Don't count on that working.
Either you know how many bytes to expect or you devise a protocal so that you know when to stop reading.

gg