I do not understand why the prepare function and the bindValue function exist in QSqlQuery, although I used them many times. Things could be simpler: QSqlQuery query(“select * from myprogrammingnotes”); […]

Using pre-built openssl such as this one always causes trouble. They may require vc runtime dll like msvcr120.dll that is not available on deployed machine, or they are not compatible […]

Many qt image related classes allow you to load an image from a file such as: QIcon ButtonIcon(“myprogrammingnotes.com.ico”); button->setIcon(ButtonIcon); Or, QPixmap pixmap(“myprogrammingnotes.com.ico”); QIcon ButtonIcon(pixmap); button->setIcon(ButtonIcon); That is very convenient. But […]

If you do not set an icon for your qt project, the built exe has a default icon, which seems a blank window. If you run the program, the icon […]

If you does not provide any parameter when configuring qt, the qt binaries you build sometimes  support ssl, sometimes do not. If your build tool chain such as Mingw includes […]

After building qt from source, you may want to install the build results by running “mingw32-make install”. But wait a minute, you do not really need to install the generated […]

qmake variable CONFIG contains the conditions that are evaluated to true. CONFIG += abcdefg abcdefg:xxxxx qtConfig is a qmake test function which returns true if the tested feature is an […]

There exists dependency relationship between qt modules. Some modules can only be built after some other modules are built. This is not only because some modules use the libs/header files […]

In my previous post what .prf files are automatically loaded by qmake, you have known that qmake will read a spec file qmake.conf before reading your .pro file. This spec […]

If you have read my post “Where does Qt find header files“, you have known that qmake will generate some include paths in the makefile to compile your project. For […]