How to convert bin to integer in PHP?
I have a project in which I need to convert a byte into an integer: <?php $a=md5(“hello”,true); echo $a[15]*1.0/255.0; The second parameter of md5 is set to true in order […]
Learn Hands-On Machine Learning with Scikit-Learn and TensorFlow
The chapter 2 of this book is a little difficult to learn because it is a hands-on project using python. It is not a simple hello world python program, but […]
python dataframe
In python, you have many ways to represent a 2-dimensional array. You can use list like:[[1,2],[3,4],[5,6]], you can use ndarray in numpy like:numpy.array([[1,2],[3,4],[5,6]]), you can also use dataframe in the […]
python numpy
If you learn python based AI software such as tensorflow, you’ll inevitably meet the package Numpy and DataFrame,etc. So you must learn how to use Numpy and DataFrame before you […]
Parse XML in Qt
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 […]
create dll in qt
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”, […]
How to pass parameters to Chromium in QtWebEngine
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 […]
How to enable ssl support for Qt?
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 […]
Access registry using Windows API in Qt
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 […]
Parent Widget and Child Widget
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, […]