Programmer Think

1. Preface From this article, write specific functional modules one by one. User modules mainly have four aspects: user login, user exit, user management, rights control.Here, you can follow simple and common practice, such as user login interface, provide a drop-down box to select the user name, then enter the password, password box cipher tex ...

MD5 tool development MD5 message digest algorithm, a widely used cryptographic hash function, can generate a 128 bit (16 byte) hash value to ensure the integrity and consistency of information transmission. MD5 was designed by Ronald Linn Rivest, an American cryptographer, and was released in 1992 to replace MD4 algo ...

The java.util.regex package mainly includes the following three classes:   Pattern class:   The Pattern object is a compiled representation of a regular expression. The Pattern class does not have a common constructor. To create a Pattern object, you must first call its public static compilation method, which returns a Pattern object. This ...

Docking window can be a convenient and fast management interface, which can make users feel the convenient operation of the application. But the docked window itself is a badge, and it can't add and arrange the controls on its own. This paper provides a simple method to add controls to docked wi ...

Qt Quick module is a standard library for writing QML applications. While the Qt QML module provides the QML engine and language infrastructure, the Qt Quick module provides all the basic types needed to create a user interface using QML. It provides a visual canvas, including types for creating and animating visual components, receiving user i ...

I. Preface Code line count is mainly used to count the number of code lines of all files in the project, including blank lines, comment lines, code lines. You can specify filter extensions, such as files that only want to count. cpp, you can also specify files or directories for statistics. The first thing to do after writing this tool is to co ...

Can make Qt under grabWindow(WId window, int x = 0, int y = 0, int width = -1, int height = -1) Create and return a QPixmap by grabbing the contents of a given window (x, y, width, height).   The parameters (x, y) specify the offset in the window, and (width, height) specify the area to be cop ...

Because drag-and-drop functions are often used in Qt programs, many examples on the Internet directly rewrite two virtual functions of this kind: protected:     virtual void dragEnterEvent(QDragEnterEvent *event) override;     virtual void dropEvent(QDropEvent *event) override; However, each contro ...

I. Preface This control originates from a music player. When writing the music player, it needs to convert the audio data into corresponding spectrum display. The third-party library of Fmod is used to process it (fmod sound system is a revolutionary audio engine for game developers, very powerful and ...

There are two main ways to share data between Qt threads: Use shared memory.Even with a variable that both threads can share (such as a global variable), both threads can access and modify the variable to share data. Use the singal/slot mechanism to transfer data from one thread to another. The first i ...