C++ serial port example

#include "stdafx.h"
#include <windows.h>
#include <iostream>
using namespace std;

typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;

HANDLE hPort; // структура для управления com-port (h_port - адрес)
LPCTSTR sPortName = L"COM7";
DCB dcbSerialParams = { 0 };

void WriteComPort(void);
void ReadComPort(void);


int main()
{
std::cout << "test" << '\n';

WriteComPort();
ReadComPort();

    return 0;
}

void WriteComPort(void) {
char data[] = "Zdorovenki buly";
DWORD dwSize = sizeof(data);
DWORD dwBytesWritten;

hPort = CreateFile(sPortName, GENERIC_READ | GENERIC_WRITE, 0, 0,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);

if (hPort == INVALID_HANDLE_VALUE) {
if (GetLastError() == ERROR_FILE_NOT_FOUND) {
cout << "serial port does not exist \n";
}
else {
cout << "other error \n";
}
}

dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
if (!GetCommState(hPort, &dcbSerialParams)) {
cout << "getting state error\n";
}
dcbSerialParams.BaudRate = CBR_115200;
dcbSerialParams.ByteSize = 8;
dcbSerialParams.StopBits = ONESTOPBIT;
dcbSerialParams.Parity = NOPARITY;

if (!SetCommState(hPort, &dcbSerialParams)) {
cout << "error setting serial port state \n";
}
WriteFile(hPort, data, dwSize, &dwBytesWritten, NULL);
}

void ReadComPort(void) {
DWORD iSize;
char sReceivedChar;
while (1) {
ReadFile(hPort, &sReceivedChar, 1, &iSize, 0);
if (iSize > 0) {
cout << sReceivedChar;
}
}
}