Thou shalt programme
The best solution for this would be to go through standard C++ and it means this:
Let’s say you have a QString, like this:
QString s = "www.amin-ahmadi.com";First convert it to std::string and then use its c_str method, like this:
s.toStdString().c_str()
By default every window you create has a rectangular shape but in case you want to have a window which is non-rectangular (such as ellipse or triangle or any shape you prefer) then you can use the approach below.
Continue reading “How to Create Custom Shaped Windows in Qt”If you have tried this then you have definitely noticed that it becomes very annoying when you want to use QScroller::grabGesture with QDialogs that are opened using exec and have used QScroller::grabGesture in the calling (parent) window or dialog.
Continue reading “How to make QScroller grabGesture work with QDialog”
Today I released the first version of Cardiograph program. It is a program that allows you to measure (monitor) your heart rate using your computer’s webcam. It is designed to be simple and accurate. Currently only Windows is supported but hopefully more operating systems will be supported in the future.
Head to Cardiograph Official Page to download and try it for yourself.
Below are screenshots of Cardiograph in action:
Let me know if you face any issues.
Web developers are quite familiar with Base64 and its usage. To put it simply, whenever to want to store, transfer (send or receive) or do anything else with the contents of a binary file (in this example, an image file) you can use Base64 encoding to simplify things by converting unreadable binary contents to a readable string.
Continue reading “How to Convert Unreadable Binary to Readable QString”
Qt does not have mouse hover, or mouse over (as some people call it) events in its widgets by default but it provides the means to do it quite easily if you just know how to inherit a class and add some protected functions to it. Here is an example that shows how to create a push button (QPushButton) that reacts to mouse hover events.
Continue reading “Mouse Hover (Over) Events for Qt Widgets”In Qt, finding the minimum or maximum value in a QList or QVector can be frustrating sometimes and it also will complicate things when you just want a quick and simple minimum and maximum. Use the pieces of codes below to get them with a single line of code.
Continue reading “How to Find Min and Max in a Vector (Qt + STL)”
There are many APIs on the web that accept JSON requests and reply using JSON. An example for this can be most of Google’s API services. For example if you are writing a Qt application that needs JSON interaction with a Google API (such as Google Webmaster API) you can easily send requests and receive responses if you follow these steps.
In Machine Vision there is a magical trick that involves Fourier transformation of an image and I would like to share it with you today. I learned this long ago from a professor of mine but I remember back then there was not much experience and information about this on the web. Also there was no program that allowed experimenting with Fourier transformation of Images, until I developed an Android application titled Image Transformer, using OpenCV and Qt, which allows you to do just that.
Whether you are building an application or a game using Qt for desktop or mobile, you probably like to see the same fonts on the target computers or phones that you set during development. Well sometimes the fonts that you have used just don’t exist in target platforms. Follow these simple steps to embed a font in your application and guarantee that it will exactly look the same when your users run them.
Continue reading “Embedding Fonts in Your Qt Application”