Unable to receive data through serial port

#include "StdAfx.h"
#include <iostream>
#define WIN32_LEAN_AND_MEAN //for GetCommState command
#include "Windows.h"
#include <WinBase.h>

using namespace std;

int main(){
  
  char init[]="";

  HANDLE serialHandle;

  // Open serial port
  serialHandle = CreateFile("\\\\.\\COM8", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);

// Do some basic settings
  DCB serialParams;
  DWORD read, written;
  serialParams.DCBlength = sizeof(serialParams);

  if((GetCommState(serialHandle, &serialParams)==0))
  {
	printf("Get configuration port has a problem.");
    return FALSE;
   }

   GetCommState(serialHandle, &serialParams);
   serialParams.BaudRate = CBR_57600;
   serialParams.ByteSize = 8;
   serialParams.StopBits = ONESTOPBIT;
   serialParams.Parity = NOPARITY;

   //set flow control="hardware"
   serialParams.fOutX=false;
   serialParams.fInX=false;
   serialParams.fOutxCtsFlow=true;
   serialParams.fOutxDsrFlow=true;
   serialParams.fDsrSensitivity=true;
   serialParams.fRtsControl=RTS_CONTROL_HANDSHAKE;
   serialParams.fDtrControl=DTR_CONTROL_HANDSHAKE;

   if (!SetCommState(serialHandle, &serialParams))
   {
	   printf("Set configuration port has a problem.");
       return FALSE;

   }


   GetCommState(serialHandle, &serialParams);

   // Set timeouts
   COMMTIMEOUTS timeout = { 0 };
   timeout.ReadIntervalTimeout = 3;
   timeout.ReadTotalTimeoutConstant = 3;
   timeout.ReadTotalTimeoutMultiplier = 3;
   timeout.WriteTotalTimeoutConstant = 3;
   timeout.WriteTotalTimeoutMultiplier = 3;

   SetCommTimeouts(serialHandle, &timeout);

   if (!SetCommTimeouts(serialHandle, &timeout))
   {
	   printf("Set configuration port has a problem.");
       return FALSE;

   }



   //write packet to poll data from robot
   WriteFile(serialHandle,">*>p4",strlen(">*>p4"),&written,NULL);


   //check whether the data can be received
  
   char buffer[257];

 int t;
 bool error;
 DWORD numberOfBytesRead=0;
 DWORD err = GetLastError();
  for (int jj=0;jj<10;jj++)
  {
	  error=ReadFile(serialHandle,LPVOID(buffer),255,&numberOfBytesRead,NULL);
	  buffer[numberOfBytesRead]=0;
	      cout<<buffer<<endl;
		  cout<<error;
  } 
  
 


  
   CloseHandle(serialHandle);
   return 0;
}