Probleme de lecture sur le port serie

#include <windows.h>
#include <winbase.h>
#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <io.h>
#include <fcntl.h>

#define PORT1	"COM1"
#define PORT2	"COM2"

#define V1200	CBR_1200
#define V2400	CBR_2400
#define V4800	CBR_4800
#define V9600	CBR_9600

#define BITS_7	7
#define BITS_8	8

#define BIT_DE_STOP_1	ONESTOPBIT
#define BIT_DE_STOP_15	ONE5STOPBITS
#define BIT_DE_STOP_2	TWOSTOPBITS

#define PAS_DE_PARITE	NOPARITY
#define PARITE_IMPAIRE	ODDPARITY
#define PARITE_PAIRE	EVENPARITY

#define OK	1
#define KO	0

#define LG_TRAME	1

int ouvrecom(char *strPort,long Baudrate,int Bitsize,int parite,int bitstop);
int reception(void *lpbuf,unsigned int ncountmax,unsigned int *pcountread);
void fermecom();
int recup();

DCB g_DCB;
HANDLE g_hCom=0;

void main(void)
{
	char lpbuf[LG_TRAME];
	unsigned int countread=0;
	HANDLE handle;
	DWORD byte=0;
	int nCarALire;
	
	
	handle=CreateFile("fabien.txt",GENERIC_WRITE,0,NULL,CREATE_ALWAYS,0,NULL);
	ouvrecom(PORT1,V9600,BITS_7,PAS_DE_PARITE,BIT_DE_STOP_1);
	for(;;){
		nCarALire=reception(lpbuf,LG_TRAME,&countread);
		printf("%s",lpbuf);
		WriteFile(handle,lpbuf,nCarALire,&byte,NULL);
		CloseHandle(handle);
		recup();

	}

}

int ouvrecom(char *strPort,long Baudrate,int Bitsize,int parite,int bitstop)
{
	g_hCom=CreateFile(strPort,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_FLAG_WRITE_THROUGH|FILE_FLAG_NO_BUFFERING,NULL);
	PurgeComm(g_hCom,PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR);
	g_DCB.DCBlength=sizeof(DCB);
	GetCommState(g_hCom,&g_DCB);
	g_DCB.BaudRate=Baudrate;
	g_DCB.ByteSize=Bitsize;
	g_DCB.Parity=parite;
	g_DCB.StopBits=bitstop;
	g_DCB.fDtrControl=DTR_CONTROL_DISABLE;
	SetCommState(g_hCom,&g_DCB);
	return 0;
}

int reception(void *lpbuf,unsigned int ncountmax,unsigned int *pcountread)
{
	COMSTAT Stat;
	DWORD Errors;
	unsigned int nCarALire;
	unsigned long NCarLus=0;
	int i=0;

	Sleep(500);
	ClearCommError(g_hCom,&Errors,&Stat);
	nCarALire=Stat.cbInQue;

	while(nCarALire==0)
	{
		ClearCommError(g_hCom,&Errors,&Stat);
		Sleep(500);
		nCarALire=Stat.cbInQue;
	}
	ReadFile(g_hCom,lpbuf,nCarALire,&NCarLus,NULL);
return nCarALire;
}

int recup()
{
	FILE *recept;
	char code[25];
	
	recept=fopen("fabien.txt","rb");
	fgets(code,20,recept);
	printf("\n%s\n",code);
	fclose(recept);
	strcat(code,".txt");
	printf("\n%s\n",code);
	rename("fabien.txt",code);
	return 0;
}