Glyphicon, font-family, @font-face, unicode, etc.
I often see cool icons on webpages such as the stars for rating. At first, I think those are images, i.e., <img> elements. But actually they are not. They are […]
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html ::before ::after pseudo-elements
Sometimes, when I inspect an element on a webpage by right-clicking the element and choosing the “Inspect Element” menu item, I can find an interesting element “::before” or “::after” inside […]
difference between php integer division and c integer division
We know the result of C integer division is an integer: 1/2=0, 1/3=0, 3/2=1. To get the remainder of integer division, you need to use %. To get the float […]
php truncate float to 2 decimal places
C programmer knows how to display float 2 decimal places with printf. In php, how to round float to 2 decimal places? It is definitely necessary to echo float with […]
WordPress shortcode
What is WordPress shortcode? WP shortcode is what you put in [] in your post. For example, if you write [dateoftoday] in your post, the dateoftoday is a shortcode. Why […]
When to delete QNetworkReply?
The usual way to use QNetworkAccessManager and QNetworkReply is: QNetworkAccessManager nam; voif fun() { QNetworkRequest request; request.setUrl(QUrl(“https://myprogrammingnotes.com”)); connect(&nam,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinished(QNetworkReply*))); QNetworkReply *reply=nam.get(request); } void replyFinished(QNetworkReply* reply) { reply->readAll(); } According to https://doc.qt.io/qt-5/qnetworkaccessmanager.html, you […]
bash function
Bash function looks strange for people who are familiar with other programming languages such as C++, JAVA, etc. First, you seem to never see a bash function that has (formal) […]
on shared library
How to build a shared library using gcc/g++? Building a shared library with gcc is easy but it takes 2 steps: gcc -c -fpic mytools.c gcc -shared -o libmytools.so mytools.o […]
Backwards compatibility and forwards compatibility
When we talk about compatibility, three objects/entities are involved. We say object2 is compatible with object1 if object3 that uses object1 is still working when it switches object1 to object2. […]
define macro in pro file
Why need to define macros in Qt project file? I have a tool source library. The library contains several header files and source files. I used conditional compilation in both […]