QFileInfo and QDir
You can pass a file system path to the construction function of QFileInfo like: QFileInfo(“C:\\a\\b/c/d/e”); The string passed as the parameter of the constructor is not necessarily a real file […]
How to check if a directory exists using QDir?
QDir has two versions of exists function that check if a folder exists: QDir(“a/b”).exists(); QDir().exists(“a/b”); There is a little difference between the two functions. If a is a directory and […]
qurl path and file name
QUrl seems a powerful tool that you can use to get every part of a url. But since a url can have complex syntax, I wonder if QUrl can handle […]
connect and disconnect lambda
In Qt, connecting a signal to a slot is done as follows: connect(sender,signal,receiver,slot); This is a static function of QObject. QObject has also non-static versions of connect so you can […]
yet another qt application deployment problem
Deploying a Qt application always causes problems for Qt users. This is why there are so many complaints and appeal to add a command to deploy program automatically. But Qt […]
how to search backwards using QString indexOf?
I made a mistake to search backwards with the indexOf function of QString: QString str=”hi, myprogrammingnotes.com is a good place to learn programming knowledge.”; int pos=str.indexOf(“good”,-1); I thought the second […]
learn python as a C++ programmer
As a C++ programmer, you do not need to buy a python book to learn it from the beginning. Bearing in your mind some differences between C++ and python is […]
how to encrypt javascript source code?
Javascript source code is clear text, which can be seen easily by right-clicking the web page and clicking the “view source code” menu item. To protect your javascript source code […]
redirect methods
You must have seen url redirect. You click an html redirect link. The link does not take you to the page it points to, but redirects the url to another […]
php setcookie not working
I set a cookie as follows: setcookie(“mycookie”, “1”, time()+8); The cookie “mycookie” is set to “1” and will expire in 8 seconds. The http Set-Cookie header received from the server […]