没有这样的文件或目录C ++ Boost库

Question

I have trouble with opening serial port Here is code:

void openport(const string & path)
{
     boost::system::error_code error;
     boost::asio::io_service io;
     boost::asio::serial_port port(io);
     port.open(path, error);
     if(ec)
     {
          cout << "failed" << ", e=" << ec.message().c_str() << endl;
     }
}
int main()
{
openport("ttyUSB0");
return 0;
}

and I got error in terminal after running program : failed, e=No such file or directory

I checked at function openport via cout that variable path is correct

When I put dmesg | grep ttyUSB I got :

[11018.593665] usb 1-1.5: FTDI USB Serial Device converter now attached to ttyUSB0
[15414.150404] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[15423.084984] usb 1-1.5: FTDI USB Serial Device converter now attached to ttyUSB0

Anyone know how to fix it?

Answer 1

On POSIX-type systems (like eg Linux) all standard devices live in the /dev/ directory. You need to provide the full path to the device:

openport("/dev/ttyUSB0");

What happens when you pass only "ttyUSB0" is that the system will look for that device in the current directory.