Command Line Interface (CLI) using C

#include <stdlib.h>
#include <windows.h>

HANDLE GetSerialPort(char *);

int main(void)
{
    HANDLE h1, h2;
    char h1_buffer[] = ("Hello from Com1:");
    char h2_buffer[24];
    DWORD byteswritten = 0, bytesread = 0;
    char c1[] = {"COM3"};
    char c2[] = {"COM4"};
    h1 = GetSerialPort(c1);
    h2 = GetSerialPort(c2);
    
    WriteFile(h1, h1_buffer, 17, &byteswritten, NULL);
    ReadFile(h2, h2_buffer, strlen(h1_buffer) + 1, &bytesread, NULL);
    
    if (bytesread)
       printf("%s\n", h2_buffer);
    else
        printf("Nothing read\n");   
    
    CloseHandle(h1);
    CloseHandle(h2); 

    getch();   
}

HANDLE GetSerialPort(char *p)
{
    HANDLE hSerial;
    hSerial = CreateFile(p,
                         GENERIC_READ | GENERIC_WRITE,
                         0,
                         0,
                         OPEN_EXISTING,
                         FILE_ATTRIBUTE_NORMAL,
                         0);

    DCB dcbSerialParams = {0};
    dcbSerialParams.DCBlength=sizeof(dcbSerialParams);
    dcbSerialParams.BaudRate=CBR_19200;
    dcbSerialParams.ByteSize=8;
    dcbSerialParams.StopBits=ONESTOPBIT;
    dcbSerialParams.Parity=NOPARITY;
    SetCommState(hSerial, &dcbSerialParams);
    return hSerial;
}