Where does Qt find header files?
This seems an old topic. If you ever learned C programming language, you must know the search rules for the header files. The search rules of gcc for headers are […]
qt .pro.user file illustrated
When you open the .pro file of a Qt project at the first time, you will be prompted to configure the project. The “Configure Project” dialog shows you the available […]
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 […]
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 […]
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 limit […]
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: […]