Javascript regex multiline match
I have a need to remove multiple lines except the first line in a string. For example, “line1\n\line2\nline3” should be converted to “line1”. At the beginning, I used the following […]
How to type tab in Qt?
The TAB character literal can be written as ‘\t’ or ‘ ‘ in your C/C++ source code. They represent the same character. Character literals are enclosed in single quotes […]
How to write a Qt debugging helper?
Only after you read my post about how Qt Creator interacts with GDB and what Qt pretty printers are, can you have some basic background knowledge about how to write […]
win32, unix,win32-g++,win32-msvc,CONFIG, etc. in Qt .pro file
win32, unix,win32-g++,win32-msvc,CONFIG, etc. in Qt .pro file are called conditions. Multiple conditions can be combined with colons. Conditions are followed by one or more expressions. Multiple expressions should be enclosed […]
How to check and set stack size limit for Qt applications?
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 […]
How to convert unicode to QString?
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: […]
unicode,ucs-2,ucs-4,utf-8,utf-16,utf-32,big endian,little endian
Of course I know what big endian and little endian are. The problem is I cannot memorize the difference between them. The cause is I misunderstand the meaning of the […]
What is the difference between variable initialization and variable assignment?
What is variable initialization? Variable initialization is giving a value to a variable at the time of defining the variable. There are quite a few methods to give a value […]
qt .pro file parser
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 […]
pointers in Locals and Expressions windows of Qt Creator
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 […]