Every process has a stack size limit. If a program’s stack uses up the memory specified by the maximum stack size, it will crash. How to check the stack size […]

Occasionally, we need to convert a number that represents the code point of a character to a QString or QChar. You may want to use the following constructor of QString: […]

The parsing function for .pro file is in QMakeParser::read. It uses two buffers: tokBuff: store the parsed tokens of a .pro file xprBuff: only store a line(or part of a […]

When debugging in Qt Creator, you can see the real-time values of variables in the Locals window and the Expressions window. In the above example, c is a variable of […]

If you’ve read my post Qt Thread, you should be able to run a task in a new thread now. But you may always want to do some controls on […]

An http request issued by firefox has the following headers. GET / HTTP/1.1\r\n Host: google.com\r\n User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0\r\n Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n Accept-Language: en-US,en;q=0.5\r\n Accept-Encoding: […]

Like other components of Qt, Qt Designer also proves the whole Qt stuff is developed by some amateurs. When you create a Qt widget project in Qt Creator, you are […]

The qDebug()<<“aaaaa” is working perfectly on Windows, but when I compile the same program on CentOS, it suddenly stops working. I cannot see anything displayed on the console. Why qDebug […]

The random number generation functions are always confusing. We often use the C rand() function to generate an integer number between 0 and RAND_MAX. We call it several times and […]

A null QString is an uninitialized QString while an empty QString is a QString initialized with an empty string(reference). QString s1; QString s2(“”); if(s1==s2) qDebug()<<“same”;//same else qDebug()<<“not same”; qDebug()<<s1.isNull();//true qDebug()<<s1.isEmpty();//true […]