Problems with using the serialport in qt and c ++

[AlsetPC]

I want to use the serial connection with an arduino between 2 different windows of my program, but when I start the serialport in a window and it executes, it changes the window and stops working, showing me "it is not connected".

[SGaist]

Hi and welcome to devnet,

Please show the code you are using.

[mrjj]

Hi
make sure you dont have the serial port already open by arduino IDE.

Also you need 2 comports where each app opens a different comport. they cannot open the same.

You need to connect the 2 comports with a serial wire.

You can also use software to allow such connection.
http://com0com.sourceforge.net/