How to Fix Qt Custom Terminal Prompt Messy Codes Problem

I made a terminal by binding bash with *QProcess*:

++
// c++ in Qt4.8.7 on CentOS7
process_ptr->start("bash -i", QIODevice::ReadWrite | QIODevice::Append);
// With the "-i" option, interactive bash is able to display the *prompt*

Commands are entered through *QCmdLine*, fed to *QProcess*, and the output is printed to *QPlainTextEdit* And I have merged the standard output channel with the standard error channel:

++
process_ptr->setProcessChannelMode(QProcess::MergedChannels);

The problem is: the command prompt(set by PS1) in *QPlainTextEdit*, which is used to display stdout or stderr, is messy. **Specifically, the content printed in *QPlainTextEdit* is as follows:**

^[]0;eng@hostname:~^G[eng@hostname 15:36:41 #17 ~]$
ls

Desktop
Documents
Downloads
Music
Pictures
Public
Templates
Videos
^[]0;eng@hostname:~^G[eng@hostname 16:05:12 #18 ~]$
echo $PS1
[\u@\H \t #\# \W]\$
^[]0;eng@hostname:~^G[eng@hostname 16:05:35 #19 ~]$

^[]0;eng@hostname:~^G[eng@hostname 16:05:36 #19 ~]$

And I have set PS1 as

PS1="[\u@\H \t #\# \W]\$ "

It looks like the second half of the command prompt

[eng@hostname 15:36:41 #17 ~]$

is what I set up correctly via PS1. **Now I don't know how to get rid of the first half**

^[]0;eng@hostname:~^G

, where

^

denotes the ASCII control character "ESC" and

^G

denotes the ASCII control character "BEL" I've researched the concept of *tty* for this issue: my practice of binding a fixed bash via *QProcess* bypasses line discipline and pty, in other words input and output content is *written/read* directly to the bash process without going through line discipline and pty(Here's the link, it might be useful: [tty/pty ) At the moment I'm not sure which module I should look at to locate the root cause of the problem: standard output/error channel redirection, the underlying principles of bash, *QPlainTextEdit* in Qt, etc. Thank you very much for your valuable thoughts or solutions!