#include <io.h>
#include <fcntl.h>
#include <stdlib.h>
#include <windows.h>
//#include <iostream>
#include <conio.h>
#include <stdio.h>
using namespace std;
//#define DEBUG

void GoToXY(int column, int line);

typedef struct
{
    int n;
    char buffer[80];
} M;

int main(int argc, char** argv)
{
    M m;
    M m2;
    m.n = 0;
    m2.n = 0;
    //m.buffer = (char*)calloc(1, 80);
    HANDLE uchwyt = CreateFile(TEXT("COM1"), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
    //unsigned char* tab = (unsigned char*)calloc(8, sizeof(unsigned char));
    unsigned char tab[9] = { 0x10, 0x02, 0x00, 0x00, 0x00, 0x00, 0x10, 0x03, 0x00 };
    DWORD byteswritten = 0; //integer 4-bajtowy
    DCB dcb; //info o porcie szeregowym
    SecureZeroMemory(&dcb, sizeof(DCB));
    dcb.DCBlength = sizeof(DCB);
    int result = GetCommState(uchwyt, &dcb); //pobiera info o danym porcie szeregowym
    dcb.BaudRate = CBR_9600; //baud rate
    dcb.ByteSize = 8; //data size, xmit and rcv
    dcb.Parity = NOPARITY; //parity bit
    dcb.StopBits = ONESTOPBIT; //stop bit
    result = SetCommState(uchwyt, &dcb);
    //char* string1 = (char*)calloc(80, sizeof(char));
    int ifread1 = ReadFile(uchwyt, LPVOID(&m2), sizeof(M), (LPDWORD)&byteswritten, 0);
    for(int i =0; i<m2.n; i++)
        printf("%c", m2.buffer[i]);
    printf("\n");
    m2.n = 0;
        char kl;
        while ((kl = _getch()) != VK_ESCAPE)
        {
            if (kl == VK_RETURN)
            {
                printf("\n");
                //scanf("%s", m.buffer);
                //m.n = strlen(m.buffer + 1);
                int ifwrite = WriteFile(uchwyt, LPCVOID(&m), sizeof(M), (LPDWORD)&byteswritten, 0);
                if (!ifwrite)
                    printf("Nie zapisano!\n");
                int ifread = ReadFile(uchwyt, LPVOID(&m2), sizeof(M), (LPDWORD)&byteswritten, 0);
                if (!ifread)
                    printf("Nie przeczytano!\n");
                if (m2.n)
                    for( int i =0; i<m2.n; i++)
                        printf("%c", m2.buffer[i]);
                printf("\n");

#ifdef DEBUG
                printf("\n%d\t%d", m.n, sizeof(m.buffer));
#endif
                m.n = 0;
                m2.n = 0;
                //memset(m.buffer, 0, 80);
                //memset(m2.buffer, 0, 80);
            }
            else
            {
                printf("%c", kl);
                m.buffer[m.n] = kl;
                m.n++;
            }
        }

        return 0;

}

void GoToXY(int column, int line)
{
    COORD coord;
    coord.X = column;
    coord.Y = line;
    HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
    if (!SetConsoleCursorPosition(hConsole, coord));
}