Questions Concerning colorizing text in Ubuntu terminal.

JonB

@jsulm said in Questions Concerning colorizing text in Ubuntu terminal.:

I think you need to escape the \

toPrint = QString("\\e[1m\\e[91m%1\\e[0m").arg(text);

I don't think so :) It takes a brave man to challenge @SGaist, especially if he has typed in code inside backticks. But here he is right. You do not want "\\e" here, to deliver a literal \e. What you want is the C++ literal for "escape character" (ANSI sequences are all escape-[-....)

\e = \x1B = escape (non-standard GCC extension)

Seems like it's a GCC non-standard though, because I had never seen it before; \x1B (or \033) is the portable version....

Cougar 0

@jsulm said in Questions Concerning colorizing text in Ubuntu terminal.:

Can you show the code?

Here is a link to download masterserver Qt5 and/or view all the cpp and h files.
http://git.333networks.com/MasterServer-Qt5/commit/

Cougar 0

@SGaist said in Questions Concerning colorizing text in Ubuntu terminal.:

It's a banner shown to everybody, you did nothing wrong.

Is there a way to mark as read so no more banner?
I checked and did not find a way to mark as read.

SGaist

@Cougar-0 said in Questions Concerning colorizing text in Ubuntu terminal.:

Is there a way to mark as read so no more banner?

No, it's a site wide banner.

SGaist

Here is a fixed version of my original idea:

#include <QRegularExpression>
#include <QCoreApplication>
#include <QString>
#include <QtDebug>

void printColorized(const QString& text)
{
    if (text.contains(QRegularExpression("(fatal|fail|error|stop)"))) {
        qDebug() << "\e[1m\e[91m" << text << "\e[0m";
    } else if (text.contains(QRegularExpression("(refused|nodevice|timeout)"))) {
        qDebug() << "\e[91m" << text << "\e[0m";
    }
}

int main(int argc, char **argv)
{
    QCoreApplication app(argc, argv);
    printColorized("fatal");
    printColorized("there is nodevice");
    return 0;
}

Cougar 0

Thank you, I will give that a try.

Cougar 0

I created a file named colortext.cpp .
I placed the file in the logger folder.
I even added the line to the file in the .pro file , if I'm not mistaken that file is created when project is compiled.
Nothing.
I tried implementing the code into other files, results were the same nothing.
My next question is, did I need to recompile all of this code in Qt Creator?
The links above will take you to all the source code.
I did create my first project with Qt Creator according to this link.
https://vitux.com/compiling-your-first-qt-program-in-ubuntu/
Worked on the first try.
Now can anyone show me how to add color and resizing code for the text?

#include <QApplication>
#include <QLabel>
#include <QWidget>

int main(int argc, char *argv[ ])
{

QApplication app(argc, argv);
QLabel hello("<center>Welcome to my first Qt program</center>");
hello.setWindowTitle("My First Qt Program");
hello.resize(400, 400);
hello.show();
return app.exec();

}

Should I not be able to just add the code to the file that would enlarge the text and color each word a different color?

See pic.
https://hosting.photobucket.com/images/dd47/cougarxr7SC/Screenshot_from_2021-09-14_22-39-23.jpg?width=450&height=278&crop=fill

SGaist

Did you run my example as is successfully ?

Cougar 0

Using your code I did the following,
I created a file named colortext.cpp . Copied and pasted your code into it.
I placed the file in the logger folder.
I even added the line to the file in the .pro file , if I'm not mistaken that file is created when project is compiled.
Nothing. No color text.
I tried implementing the code into other files in the logger folder, results were the same nothing.
My next question is, did I need to recompile all of this code in Qt Creator?
That is why I did his simple project. Now to get the text in color, and possible change the size of the text.
Just to see it I can get that to work.
I do believe it is on my end, not sure what I am dong wrong, but figuring things out is half the fun of doing this.

Cougar 0

I tried the following to see what would happen.

#include <QApplication>
#include <QLabel>
#include <QWidget>
#include <QRegularExpression>
#include <QCoreApplication>
#include <QString>
#include <QtDebug>

int main(int argc, char *argv[ ])
{

QApplication app(argc, argv);
QLabel hello("<center>Welcome to my first Qt program</center>");
hello.setWindowTitle("My First Qt Program");
hello.resize(400, 400);
hello.show();

void printColorized(const QString& text)

    if (text.contains(QRegularExpression("Welcome to my first Qt program"))) {
        qDebug() << "\e[1m\e[91m" << text << "\e[0m";
    }
    return app.exec();
}

Program ran with no error or change in color.

SGaist

One issue it that you are not calling printColorized in that test application.

Cougar 0

@SGaist said in Questions Concerning colorizing text in Ubuntu terminal.:

One issue it that you are not calling printColorized in that test application.

May I ask where in your code does it call the "printColorized"?
I looked and did not see it, plus I searched the web for "calling printColorizd in Qt" , and no results.
I di find this about QColor Class.
https://doc.qt.io/qt-5/qcolor.html
If you code does not call it could that the reason I could not get colored text in my friends program?
SGaist, if it is not too much trouble, could you do this,
https://vitux.com/compiling-your-first-qt-program-in-ubuntu/
and add color text it?
Then I could see the code what it takes to colorize the text.
Thank you for all your help.

Cougar 0

I tried,

#include <QApplication>
#include <QLabel>
#include <QWidget>
#include <QRegularExpression>
#include <QCoreApplication>
#include <QString>
#include <QtDebug>

int main(int argc, char *argv[ ])
{

QApplication app(argc, argv);
QLabel hello("<center>Welcome to my first Qt program</center>");
hello.setWindowTitle("My First Qt Program");
hello.resize(400, 400);
hello.show();
return app.exec();

}
void printColorized(const QString& text)
{
    if (text.contains(QRegularExpression("My First Qt Program"))) {
        qDebug() << "\e[1m\e[91m" << text << "\e[0m";
    } 
    if (text.contains(QRegularExpression("Welcome to my first Qt program"))) {
        qDebug() << "\e[91m" << text << "\e[0m";
    }
}

int main(int argc, char **argv)
{
    QCoreApplication app(argc, argv);
    printColorized("hello");
    printColorized("there is no text");
    return 0;
}

If calling printColorized in the above code is not being called then that could be why I am not able to get it to work?
SGaist, I did change your original code to match what was needed here.

Christian Ehrlicher

two main functions?

SGaist

Beside the issue of having two main function, your printColorized version won't show anything on the console unless text contains something similar to the regular expressions you wrote there which neither "hello" nor "there is no text" do.

Cougar 0

Totally missed the two main functions, kind of distracted, my heart is in a-vib, beating 160 beats a minute.
Redid the code.

#include <QApplication>
#include <QLabel>
#include <QWidget>
#include <QRegularExpression>
#include <QCoreApplication>
#include <QString>
#include <QtDebug>

int main(int argc, char *argv[ ])
{

	QApplication app(argc, argv);
	QLabel hello("<center>Welcome to my first Qt program</center>");
	hello.setWindowTitle("My First Qt Program");
	hello.show();
	return app.exec();
	}
	
void printColorized(const QString& text)
	{
        if (text.contains(QRegularExpression("My First Qt Program"))) {
        qDebug() << "\e[1m\e[91m" << text << "\e[0m";
        } 
        if (text.contains(QRegularExpression("Welcome to my first Qt program"))) {
        qDebug() << "\e[91m" << text << "\e[0m";
        }

        {
        QCoreApplication app(argc, argv);
        printColorized("My First Qt Program");
        printColorized("Welcome to my first Qt program");
        return 0;
    }
}

I thought this is what colored the text.

 if (text.contains(QRegularExpression("My First Qt Program"))) {
        qDebug() << "\e[1m\e[91m" << text << "\e[0m";

JonB

@Cougar-0 said in Questions Concerning colorizing text in Ubuntu terminal.:

I thought this is what colored the text.

It does. But I'm afraid your code is not right:

You have QApplication app(argc, argv); in main(). You must not have QCoreApplication app(argc, argv); in another function, like printColorized().
You have printColorized() doing the calls to printColorized(). You don't want that, and besides nothing in main() calls printColorized() in the first place.

int main(int argc, char *argv[ ])
{

	QApplication app(argc, argv);
	QLabel hello("<center>Welcome to my first Qt program</center>");
	hello.setWindowTitle("My First Qt Program");
	hello.show();
        printColorized("My First Qt Program");
        printColorized("Welcome to my first Qt program");
        return app.exec();
}

void printColorized(const QString& text)
{
        if (text.contains(QRegularExpression("My First Qt Program"))) {
            qDebug() << "\e[1m\e[91m" << text << "\e[0m";
        } 
        if (text.contains(QRegularExpression("Welcome to my first Qt program"))) {
            qDebug() << "\e[91m" << text << "\e[0m";
        }
}

Don't forget all this is going to do is show a colorized message in the console of Qt Creator, or maybe in a terminal if you run it that way. This will have nothing to do with the UI label you show, which will just show the original text. I don't know if that is what you intend. If you are expecting it to appear in the UI/on the label, it won't.

Cougar 0

Tried the new code no luck.
I believe I've pester you guys enough!
I want to thank everyone who helped!
I have other issues I need to tend to.
Again, thanks guys it's been fun!

Discovery!!
All this time I have been adding new code into the testmain.cpp.
All it takes to run the project/program was the compiled file, I believe it is a bin file.
I removed all files and it ran, removed that one and it errored.
So those file are not being read at all.
So now I know you have to recompile it when adding new code to the file.
Again Thanks for all the help guys!

Cougar 0

Ok, JonB,
I tried recompiling with your code and got an error.
I tried searching online but there is nothing about it I cannot believe I am the first person to get this error.

cougarxr7@GoneSpy:~/Programs/First Qt Program$ make
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIC -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I. -I. -isystem /usr/include/x86_64-linux-gnu/qt5 -isystem /usr/include/x86_64-linux-gnu/qt5/QtWidgets -isystem /usr/include/x86_64-linux-gnu/qt5/QtGui -isystem /usr/include/x86_64-linux-gnu/qt5/QtCore -I. -I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++ -o testmain.o testmain.cpp
testmain.cpp: In function ‘int main(int, char**)’:
testmain.cpp:16:9: error: ‘printColorized’ was not declared in this scope
   16 |         printColorized("My First Qt Program");
      |         ^~~~~~~~~~~~~~
make: *** [Makefile:363: testmain.o] Error 1
cougarxr7@GoneSpy:~/Programs/First Qt Program$

error: ‘printColorized’ was not declared in this scope
Have you seen that error before?
Funny, the program still ran fine, no color though.

jsulm

@Cougar-0 said in Questions Concerning colorizing text in Ubuntu terminal.:

error: ‘printColorized’ was not declared in this scope

Simply put the printColorized function definition before main()...

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Questions Concerning colorizing text in Ubuntu terminal.