모바일기기랑 컴터랑 시리얼통신하려는데
기기->컴은 잘되는데
컴->기기는 안돼서 보니까
수신스레드에서 ReadFile에서 블로킹 된다능 으헝

소스는 ms에 있는 예제 그대로 가져다 씀
살려달라능 으헝

http://msdn.microsoft.com/en-us/library/cc500407.aspx

//======================================================================
// ReadThread - Receives characters from the serial port
//
DWORD WINAPI ReadThread (PVOID pArg)
{
          HWND hWnd;
          DWORD cBytes, i;
         WCHAR szText[TEXTSIZE];
         char szAnsi[TEXTSIZE];
         size_t siz;
         hWnd = (HWND)pArg;

        while (fContinue) {
                  for (i = 0; i < sizeof (szAnsi)-1; i++) {
                            while (!ReadFile (hComPort, &szAnsi[i], 1, &cBytes, 0))
                                            if (hComPort == INVALID_HANDLE_VALUE)
                                            return 0;

                            if (szAnsi[i] == ‘\\n’) {
                                        szAnsi[i+1] = ‘\\0’;
                                        break;
                            }
                }

               // Convert to Unicode
              mbstowcs_s (&siz, szText, dim (szText), szAnsi, _TRUNCATE);
              SendDlgItemMessage (hWnd, ID_RCVTEXT, EM_REPLACESEL, 0, (LPARAM)szText);
        }

        return 0;
}