The serial.openDevice("COM_STH", baud_rate) function does not open COM1 and COM(>10)

[KoalaWill]

I'm a highschool student, and I was using this library for a school project(Thank you really really much by the way🙏😁👍), but then I found this issue while testing...or is it just my own problem?(If yes then I'm sooooo sorry).

[imabot2]

Hi, if you solve this problem by yourself, could you explain here what was the issue for others?

[KoalaWill]

Of course!

My code before was something like this

string Scan_COMS() {
   serialib device;
   cout << "Scaning your device...\n";
   string cur_COM = "COMX";
   bool found = false;
   string found_port;
   // Changing the string to next port
   for (int i = 1; i <= 255; i++) {
      if (i <= 10) {
         cur_COM.pop_back();
      } else if (i <= 100) {
         cur_COM.pop_back();
         cur_COM.pop_back();
      } else {
         cur_COM.pop_back();
         cur_COM.pop_back();
         cur_COM.pop_back();
      }
      cur_COM += to_string(i);

      // try to connect to the arduino
      if (device.openDevice(cur_COM.c_str(), baud) == 1) {
         cout << "Device detected on " << cur_COM << endl;
         cout << "Successfully connected to your device !\n";
         found = true;
         found_port = cur_COM;
         // Close the device before testing the next port
         device.closeDevice();
         break;
      }
   }
   if (found == false) {
      cout << "I can't find your device.\n";
      return 0;
   }
   else {
      port_connected = found_port;
      return found_port;
   }
}

The problem is that the code seems to only be capable of finding COMs below COM10.
However, after editing the code like this (which is changing the format of the cur
_COM string and using sprintf instead of popping and pushing stuff into the string)

My code now

string Scan_COMS() {
   serialib device;
   cout << "Scaning your device...\n";
   char cur_COM[9] = "\\\\.\\COMX";
   bool found = false;
   string found_port;
   for (int i = 1; i <= 255; i++) {
      sprintf (cur_COM,"\\\\.\\COM%d",i);
      // try to connect to the arduino
      if (device.openDevice(cur_COM, baud) == 1) {
         cout << "Device detected on " << cur_COM << endl;
         cout << "Successfully connected to your device !\n";
         found = true;
         found_port = cur_COM;
         // Close the device before testing the next port
         device.closeDevice();
         break;
      }
   }
   if (found == false) {
      cout << "I can't find your device.\n";
      return 0;
   }
   else {
      port_connected = found_port;
      return found_port;
   }
}

it worked!

Thanks for your great library, I wouldn't have been able to do my project without it!

[imabot2]

Great, thank you so much for your feedback, for sure it will help others!