C++ Qt 12 - QFile 

not only is this educational and entertaining, but this this is in the best format for me! Small screen so I don't have to be in 1080p full screen to read the text and I can have QT open next to it, short videos so I don't lose the will to live, and finally you have a really nice voice XD its not normal us people from Britain enjoy an America accent XD

This guy really deserves a BIG thumps up for great tutorials. Thanks buddy for detailed and part by part tutorial.

Errata (from offical Qt forums): 03:48 Since you’re teaching good practice, it is important to stress that. (Calling close() isn’t mandatory since the QFile object will be destroyed at the end of scope, closing it. The explicit call to close() becomes therefore a matter of “style”/“habit”). 04:38 The QTextStream is called “out” instead of “mOut”. Why not keeping your naming convention for variables? 04:44 Not a reference, but a pointer to

QFile automatically flushes when it’s closed, and it automatically closes when it’s destroyed => you can remove the last two lines altogether and have a correct behaviour). Instead, you call mFile.close() without flushing the QTextStream, which is an error!

These tutes are great. I'm a C# guy delving into the world of C++. I'm finding your explanations really helpful. It's really interesting seeing the difference in environments of the two languages/runtimes. Thanks!

Errata (from offical Qt forums): 03:10 WriteOnly and Text are actually defined in QIODevice; a better style is to prefix the enum with the scope of the class that declared them, rather than an arbitrary subclass. 03:36 Minor typo on “writting”

Bryan, you are great! Thanks for the informative videos on Qt, I will see a whole lot of them. /Swedish-Norwegian

I stopped going to google to find something I need to know about. I just go to youtube and look for one of your videos.

The use of flush() is excessive there, close() performs flushing automatically. Great tutorial!

thanks bro, best wishes!

@VoidRealms thanks for posting the corrections

Your tutorials are the best! Could you please comment how to write the console output? thanks

Errata (from offical Qt forums): 06:00 Why QString and readAll()? For consistency, you wrote a char array, then you read back a char array, or create a QString in the write method and read back a QString.

Hello you too my man brian

Errata (from offical Qt forums): 05:05 This is an error: the explaination is correct, but you actually want to call “out.flush()”, not (only) “mFile.flush()” there, otherwise you’re not flushing the QTextStream’s internal buffer but QFile’s one. After out.flush() you can call mFile.flush(). Again, it should be stressed that you’re introducing flush() just for the sake of argument, because QTextStream automatically flushes when it’s destroyed (and

Ctrl + c and Ctrl + v best short cuts ever

Thank you

what if you want to find a txt file versus creating it first?

Does standar C++ methods work too in QT, like ofstream or ifstream..?

is c++ way of doing this much faster or it is equal? I can't see diffrence.

"...rather than blindly following tutorials that you find on internet..." oh wait. ahahahahaahah =) keep up man, really good videos!

How can I move an element to where the cursor is? For example: I want to move the combobox to the position of the cursor in the text box of the element.

eeh having a little problem, maybe because i got the last qt version 5.0.2 and qDebug is used like this: qDebug( "Text"); but when i put qDebug( mText); that is a QString i got an error, how do i print with the new qDebug a variable?

qDebug doesn't work on my system when after QCoreApplication. I tried various term settings in the options with no luck. Ended up using std::cout

If I have QString string, how do I read the individual characters from the string one at a time using Qt c++?

Are you able to integrate QFile into a Gui project? Or does it only function correctly in console applications?

function names starting with uppercase letters! is this wrong or a standard in qt?

Using Linux For some reason that I can not see the If statement does not work properly overriding the Writing and Reading of the Created Text file. When I simply use mFile.open(QFile::ReadOnly | QFile::Text); ...and mFile.open(QFile::WriteOnly | QFile::Text); all works fine BUT using the if(!mFile.open(QFile::WriteOnly | QFile::Text)); { qDebug()

How can I read a variable instead of a String?

I got this error following your tutorial... any idea? I'm using Qt 5.2.1. error: C2512: 'QDebug::QDebug' : no appropriate default constructor available

Why do you use pointer to create new widgets, but not for something like QTextStream?

hey Brian.. I have a question... How can I print a QString to the screen using qDebug() without those quotes(at the beggining and at the end). For the example if I write QString text = "C'mon"; qDebug()

Why does "Hello world" appear in the file mFilename only once when you re-run the program a second time. Is there a way to specify WriteOnlyAppend vs. WriteOnlyReplace [my nomenclature] when writing? I couldn't find anything in the help resource.

Bryan, how can I jump a line into the file? I want to write something, and then other something on the other line.. " " doesn't work.. And how can I write the actual time before writting something, so I know when that I wrote that.. Can you help me?

Hi . Can you please show how to use AutoCloseHandler. I am trying to modify a file outside the program and read the contents but my program is reading the old contents :( (

what does the qDebug function do?? is it the same as cout in c++??

whats the difference between: QFile::WriteOnly | QFile::Text and to only write: QFile::WriteOnly because i´ve done each and the result is the same

For the newest version of QT ; Qfile file; file.open(QIO::Device::ReadOnly) or file.open(QIO::Device::WriteOnly) was succesful.

Sorry i find the solution, i included this: include "QtDebug" that let me use the sinthaxis: qDebug()

It seems better for console application to just... return 0; //a.exec(); else I get exit code -1073741510.

My biggest question is why is a bitwise or ( | ) applied between QFile::WriteOnly and QFile::Text.

@VoidRealms thanks for posting the corrections