Serial communication not working. ReadFile() has a problem.

Hi All,

Currently I try to use serial communication (XBee) to communicate between the PC and the robot via vc++. I have done the same thing via MATLAB. So there is no problem for the hardware.

After I write commands to poll data, I can not receive any data. The interface requirement is： 

Please give me your help.

// This is the main DLL file.
#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 written;
  DWORD read;
  char buffer[1];
  char data[103];
  int t=0;
  int jj=0;
  //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;
   //suggest to apply
   //serialParams.fBinary=true;
   //serialParams.fParity=true;

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

   }


   GetCommState(serialHandle, &serialParams);

   // Set timeouts
  COMMTIMEOUTS timeout = { 0 };
  timeout.ReadIntervalTimeout = 100;
   timeout.ReadTotalTimeoutConstant = 100;
   timeout.ReadTotalTimeoutMultiplier = 100;
   timeout.WriteTotalTimeoutConstant = 100;
   timeout.WriteTotalTimeoutMultiplier = 100;

   SetCommTimeouts(serialHandle, &timeout);

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

   }
   

	bool err1;
   
   //clear the buffer
PurgeComm(serialHandle,PURGE_RXCLEAR);


  //write >*>p0x0004 to poll IMU_CalcData from robot
   
	BYTE test[]={62,42,62,112,4};
    WriteFile(serialHandle, test,5,&written,NULL);
 
  do {
	data[jj]=0;
	err1=ReadFile (serialHandle,&data[jj],1,&read, NULL);
	cout<<read;
	cout<<(int)data[jj];
	cout<<err1;
    cout<<"\n";
	if (read!=0) 
	{
 	jj++;
   
	}
	t++;
	Sleep(10);
 } while (t<100); 
   
   CloseHandle(serialHandle);
   
   return 0;
}