Hello,
I am doing simple read/write program for serial port. I am faceing a error that i don´t understand. Error is:

"error C2664: 'CreateFileW' : cannot convert parameter 1 from 'const char [5]' to 'LPCWSTR' "

My whole program:

#include <windows.h>
#include <iostream>
#include <string>

using namespace std;

void set_com_pin(bool value);


int main(int argc, char* argv[])
{
if(argc != 2)
{
cerr<<"bad usage !"<<endl;
return -1;
}

bool onoff;
if(string(argv[1])==string("-on"))onoff=true;
else if(string(argv[1])==string("-off"))onoff=false;
else
{
cerr<<"bad parameters !"<<endl;
return -1;
}

set_com_pin(onoff);
return 0;
}

void set_com_pin(bool value)
{
// open port for I/O
HANDLE hPort = CreateFile("COM1", GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);

if(hPort == INVALID_HANDLE_VALUE) {
cout<<"Failed to open port" <<endl;
} else {
// set timeouts
COMMTIMEOUTS cto = { 1, 100, 1000, 0, 0 };


if(!SetCommTimeouts(hPort,&cto))
cout<<"SetCommTimeouts failed" <<endl;


// set DCB
DCB dcb;
memset(&dcb,0,sizeof(dcb));
dcb.DCBlength = sizeof(dcb);
dcb.BaudRate = 19200;
dcb.fBinary = 1;
dcb.fDtrControl = DTR_CONTROL_ENABLE;
dcb.fRtsControl = RTS_CONTROL_ENABLE;
// dcb.fOutxCtsFlow = 1;
// dcb.fRtsControl = DTR_CONTROL_HANDSHAKE;

dcb.Parity = NOPARITY;
dcb.StopBits = ONESTOPBIT;
dcb.ByteSize = 8;

if(!SetCommState(hPort,&dcb))
cout<<"SetCommState failed" << endl;

char buf[7];
DWORD read=0;
DWORD write=1; // Number of bytes to write to serial port
buf[0] = 72; // Decmial value to write to serial port
WriteFile(hPort, buf, write, &write, NULL);

ReadFile(hPort, buf, sizeof(buf), &read, NULL);

DWORD i;
for(i=0; i<read; i++)
cout<<"%i", (unsigned char)buf[i];

CloseHandle(hPort);
}


}

Thanks in advance