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 […]
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. […]
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 […]
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 […]
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 are called conditions. Multiple conditions can be combined with colons. Conditions are followed by one or more expressions. Multiple expressions should be enclosed […]
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 […]