Thou shalt programme
You can convert QBuffer to QString using buffer function of the QBuffer. Here is how you can do it.
QBuffer b;
b.open(QBuffer::ReadWrite);
b.write("http://amin-ahmadi.com");
QString str = b.buffer();
qDebug() << str; // "http://amin-ahmadi.com"
b.close();
Qt Framework includes a class called QBuffer that can be used to access a QByteArray (internal QByteArray to be precise) as if it is a file. So you can use Stream readers and writers to access data in it similar to a QFile.
Continue reading “How to Create and Use Buffers in Qt”
You might have come across the following (Not Acceptable) error when trying to download files from some websites using Qt. This error message is generated by ModSecurity and it usually means that for some reason the web server does not allow downloading of the file using the method you are trying. In my case it was because of the User-Agent Header set to a value not allowed by the server. So here is how I fixed it:
Continue reading “Fix ModSecurity Issues in Qt Network Module Download Functionality”
You can create a QPixmap and convert it to QImage if you just want to have a QImage for modification and manipulation. Here, you can use the following code to achieve this:
int width = 100;
int height = 200;
QImage image = QPixmap(width, height).toImage();
RAW, or to put it in terms of file extension, CR2 and CRW files are the images produced using Canon EOS cameras. A RAW photo, as it appears from it’s name, is the raw format of the image, meaning it contains the exact binary data that was recorded by a specific camera when the photo was taken.
Continue reading “How to handle Canon EOS RAW images in C++/Qt”
Qt offers convenient classes for basic image processing and pixel manipulation. In this article I am going to describe how you can change the hue level of a whole image using QImage class in Qt.
Continue reading “How to Change Hue Level of an Image in Qt”Below is what I do for clearing and compressing my SQLite database files in Qt. Usually when you delete some entries from a SQLite database, it does not get deleted physically but instead it just gets marked as deleted and is not retrieved in queries. The good thing about this is that it works fast. But the obvious downside is the fact that the free space is not released. To release the space occupied by deleted files you need to do the following:
Continue reading “How to Reduce Your SQLite Database File Size Using Qt”
In this post I am going to share the source code and explain a very simple example project that can be used as a starting point for anyone who wants to begin using OpenGL in Qt. As it is seen in the picture, this program draws a single place on the screen and allows you to rotate it in all directions.
Continue reading “OpenGL in Qt for Beginners”You need to use a QRegExp to achieve this. “\s” means any white space character and “+” means any number of that pattern. So you can use the following line to find any number of consecutive white spaces and split you string:
line.split(QRegExp("\s+"))
If you have already seen my Guide on How to Build Qt 5.5 Static wit MSVC then you probably won’t find anything new in this article. This only covers the paths and configurations for Qt 5.6 and it’s titled MSVC 2010 because Qt 5.6 installation includes pre-built libraries for all Compiler versions except MSVC 2010.
Continue reading “How to Build Qt 5.6 Statically Using MSVC++ 2010”