My Programming Notes

In Qt, there seem a lot of classes related to XML:QDomDocument, QXmlStreamReader,QXmlSimpleReader,etc. You can choose any one to parse an XML document.  QDomDocument is more powerful but keep all content […]

Creating dll seems an easy task in Qt. In Qt creator,  click File/New File or Project/Projects/Library/C++ Library, then simply choose a name, you will create a dll project. Click “build”, […]

We have talked about programming with Qt WebEngine. Every time you create a QWebEngineView object, you’ll start a QtWebEngineProcess.exe process. The process corresponds to the Chromium browser Qt WebEngine is […]

I use some RSA encrypt/decrypt functions in openssl lib so I installed the latest openssl lib 1.1.0 and imported the lib into my Qt project. I thought  my Qt was […]

Although you can use QSettings to access Windows registry, sometimes it is more convenient to use Windows API directly,i.e., you are porting an old project that uses Windows API. The […]

The constructor of QWidget has an optional parameter:parent. I did not take care about this parameter in the past. Sometimes I create a QWidget  object without providing the parent parameter, […]

I have been wondering how the size of Qt widgets is determined. I read a lot of articles about sizeHint, minimumSizeHint, minimumSize,resize, sizePolicy, geometry, layout, etc. Guess what? I am […]

openssl is a common used third-party library. I imported the library in my Mingw project by adding the following lines in the .pro file: INCLUDEPATH += c:\Qt\Qt5.12.1\Tools\mingw730_64\opt\include LIBS += -L […]

In Qt Creator, a build kit is composed of a compiler and a debugger,etc. Click Tools/Options, you may see quite a few kits such as Desktop Qt 5.12.1 MinGW 64-bit, Desktop Qt 5.12.1 […]