WINDOWSAPI Operation Serial Port

#include <windows.h>#include<stdio.h>intMain () {//1. Open the serial portHANDLE HCom; HCom= CreateFile ("COM1", Generic_read|Generic_write,0, NULL, open_existing,0, NULL); if(HCom = = (HANDLE)-1) printf ("failed to open serial port!\n"); Elseprintf ("Open serial port successful!\n"); //2. Initialize the serial portDCB DCB; Getcommstate (HCom,&DCB); Dcb. BaudRate=9600;//baud rate//dcb.fparity = 0;//parity EnableDcb. ByteSize =8;//Data bitsDcb. Parity = noparity;//Parity CheckDcb. StopBits = Onestopbit;//Stop BitSetCommState (HCom, &DCB); Setupcomm (HCom,1024x768,1024x768);    Commtimeouts timeouts; //Set Read TimeoutTimeouts.readintervaltimeout = +; Timeouts.readtotaltimeoutconstant= the; Timeouts.readtotaltimeoutmultiplier= -; //Set Write timeoutTimeouts.writetotaltimeoutconstant = -; Timeouts.writetotaltimeoutmultiplier= -; SetCommTimeouts (HCom,&timeouts); //emptying buffersPurgeComm (HCom, purge_txclear|purge_rxclear); Sleep ( -); //3. Read and write serialUnsignedCharbuf[Ten] = {0x00,0x06,'D','A','T','A'};    BOOL Bwritestat; DWORD Dwbyteswrite=6; Bwritestat= WriteFile (HCom, buf, Dwbyteswrite, &Dwbyteswrite, NULL); if(!Bwritestat) {printf ("failed to write serial port! \ n"); }    Elseprintf ("Write serial port success!\n"); unsignedCharrbuf[1024x768];    BOOL Breadstat;    DWORD dwBytesRead; Breadstat= ReadFile (HCom, RBuf,1024x768, &dwBytesRead, NULL); if(!Breadstat) {printf ("Read serial failed! \ n"); }    Else{printf ("read serial port success!\n"); }     for(DWORD j =0; J < dwBytesRead; J + +) {printf ("%x", Rbuf[j]); } printf ("\ n"); //4. Close the serial portCloseHandle (HCom); return 0;}