#include "windows.h"
#include <stdio.h>
#include <ctype.h>
#include <io.h>
#include <conio.h>
#include <stdlib.h>

#define maxBytes 111

int main()
{
	HANDLE hSerial;
	DCB dcbSerialParams = {0};
	COMMTIMEOUTS timeouts = {0};
	DWORD dwBytesRead = 0;
	char szBuff[maxBytes] = {0};
	int firstdigit = 0;
	FILE *fp;
	int i;

	//opening the serial port
	hSerial = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);

	if(hSerial==INVALID_HANDLE_VALUE)
	{
		if(GetLastError()==ERROR_FILE_NOT_FOUND)
		{
			printf("Serial port does not exist\n");
		}
		printf("Other errors\n");
	}

	//setting parameters
	dcbSerialParams.DCBlength = sizeof (dcbSerialParams);

	//GetCommState is to retrieves the current control settings for a specific communications device.
	if (!GetCommState(hSerial, &dcbSerialParams))
	{
		printf("Not GetCommState, not able to retrieves the current control\n");
	}

	dcbSerialParams.BaudRate = CBR_115200;
	dcbSerialParams.ByteSize = 8;
	dcbSerialParams.StopBits = ONESTOPBIT;
	dcbSerialParams.Parity = NOPARITY;

	//SetCommState configures a communications device according to the specifications
	//in DCB. The function reinitializes all hardware control settings but it does not
	//empty output or input queues
	if (!SetCommState(hSerial, &dcbSerialParams))
	{
		printf("Not SetCommState, cannot configures serial port according to DCB specifications set\n");
	}

	//setting timeouts
	timeouts.ReadIntervalTimeout = 40;
	timeouts.ReadTotalTimeoutConstant = 40;
	timeouts.ReadTotalTimeoutMultiplier = 40;
	timeouts.WriteTotalTimeoutConstant = 40;
	timeouts.WriteTotalTimeoutMultiplier = 40;

	//SetCommTimeouts set the time out parameters for all read and write operation
	if (!SetCommTimeouts(hSerial, &timeouts))
	{
		printf("Not SetCommTimeouts, cannot set the timeout parameters to serial port\n");
	}

	//reading data
	//ReadFile reads data from the specified file or i/o devices.
	printf("The content inside the file: \n\n");
	if(!ReadFile(hSerial, szBuff, maxBytes, &dwBytesRead, NULL))
	{
		 printf("error\n");
	}
	else
	{
		fp = fopen("c:\\new.txt", "w");
		while (ReadFile(hSerial, szBuff, maxBytes, &dwBytesRead, NULL))
		{
			
			for (i = 0; i < dwBytesRead; i++)
			{
				if (szBuff[i] == 10 || szBuff[i] == 13)
				{
					fprintf(fp, "\n");
					printf("\n");
					break;
				}
				else
				{
				fprintf(fp, "%c", szBuff[i]);
				printf("%c", szBuff[i]);	
				}
			}
						 
		}

		fclose(fp);

	CloseHandle(hSerial);

	}
}

#include "windows.h"
#include <stdio.h>
#include <io.h>
#include <conio.h>
#include <stdlib.h>

#define maxBytes 111
#define MAX 256

int main()
{
	HANDLE hSerial;
	DCB dcbSerialParams = {0};
	COMMTIMEOUTS timeouts = {0};
	DWORD dwBytesWrite = 0;
	int i;
	char szBuff[maxBytes];
	char stemp[MAX];
	FILE *fp;


	//opening the serial port
	hSerial = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);

	if(hSerial==INVALID_HANDLE_VALUE)
	{
		if(GetLastError()==ERROR_FILE_NOT_FOUND)
		{
			printf("Serial port does not exist\n");
		}
		printf("Other errors\n");
	}

	//setting parameters
	dcbSerialParams.DCBlength = sizeof (dcbSerialParams);

	//GetCommState is to retrieves the current control settings for a specific communications device.
	if (!GetCommState(hSerial, &dcbSerialParams))
	{
		printf("Not GetCommState, not able to retrieves the current control.\n");
	}

	dcbSerialParams.BaudRate = CBR_115200;
	dcbSerialParams.ByteSize = 8;
	dcbSerialParams.StopBits = ONESTOPBIT;
	dcbSerialParams.Parity = NOPARITY;

	//SetCommState configures a communications device according to the specifications
	//in DCB. The function reinitializes all hardware control settings but it does not
	//empty output or input queues
	if (!SetCommState(hSerial, &dcbSerialParams))
	{
		printf("Not SetCommState, cannot configures serial port according to DCB specifications set.\n");
	}

	//setting timeouts
	timeouts.ReadIntervalTimeout = 40;
	timeouts.ReadTotalTimeoutConstant = 40;
	timeouts.ReadTotalTimeoutMultiplier = 40;
	timeouts.WriteTotalTimeoutConstant = 40;
	timeouts.WriteTotalTimeoutMultiplier = 40;

	//SetCommTimeouts set the time out parameters for all reand and write operation
	if (!SetCommTimeouts(hSerial, &timeouts))
	{
		printf("Not SetCommTimeouts, cannot set the timeout parameters to serial port.\n");
	}

	//Writting data
	//WriteFile write data from the specified file or i/o devices.
	printf("The content inside the file: \n\n");
	fp = fopen("c:\\helloworld.txt", "r");
	while ((fgets(stemp, MAX, fp)) != NULL)
	{
		i = sprintf(szBuff, "%s", stemp);
		if (!WriteFile(hSerial, szBuff, maxBytes, &dwBytesWrite, NULL))
		{
			printf("Serial port cannot write file.\n");
		}
		else
		{
				printf("%s", szBuff);
		}
	}
	fclose(fp);
	CloseHandle(hSerial);
}