C++ → PTZ-camera control. Protocol Pelco-P

Pelco, Pelco-P, PTZ, протокол

In the previous article I was considered an option to work with Pelco-D protocol, and now look to work with Pelco-P protocol - a modified variation of the previous PTZ-camera control protocol, which is also developed by the same name …

Qt → Qt/C++ - Lesson 046. QThread - Introduction

Qt, QThread, потоки

GUI thread and the worker thread

Each program has a single thread (thread) on startup. This thread is called the main flow thread or GUI in Qt applications. Qt GUI to be started in this thread. All widgets and several …

C++ → PTZ-camera control. Pelco-D protocol

Pelco, PTZ, протокол, Pelco-D, камера

Pelco-D - is a PTZ-camera control protocol developed by the same name by Pelco. As a rule, used over RS482/485 interface for communicating with cameras equipped with servo drives.

Pelco-D protocol has in the arsenal of a set of standard …

Qt → Three Steps to a Successful Embedded System with Qt

emdedded, Qt, встраиваемые системы

Embedded product development requires three major steps: hardware platform selection, operating system selection, and user interface (UI) development. All three of these steps are closely related to each other and have a significant impact on time to market, project costs …

Qt → Qt/C++ - Lesson 045. SvgReader on the Qt. Loading data from SVG file into QGraphicsScene

Svg Reader, SVG, Qt, QGraphicsScene

In the last article I was considered an example of how to save objects in a graphical scene SVG file, and then we were able to open it in CorelDraw. Now try the same file open and restore the graphics …

Qt → Qt/C++ - Lesson 044. Saving objects from QGraphicsScene into SVG

SVG, Qt, CorelDraw, QGraphicsScene

Using Qt, you can save the contents of the graphic scene QGraphicsScene to SVG vector graphics files that are opened without problems after such editors as CorelDraw. I propose to write a small application that will save the contents of …

Qt → Qt WinAPI - Lesson 003. How to use windeployqt for collect all DLL?

windows, Qt, WinAPI, windeployqt, DLL

In one of the lessons of the Qt it has already been shown how to collect all the DLL, used in the project for the training program for use on other PCs running Microsoft Windows, and now propose to get …

Qt → Qt Virtual Keyboard Updated with Handwriting Recognition

Blog, HWR, Qt, Qt Virtual Keyboard, новости

Translation of the official news, By Rainer Keller

We are proud to announce a new release of Qt Virtual Keyboard with Handwriting Recognition (HWR), improved performance, Nuance T9 integration, and support for Traditional Chinese!

Qt Virtual Keyboard has been updated …

Qt → QGlobalShortcut - Global hotkeys

linux, Qt, QGlobalShortcut, HotKey, Windows

In the process of studying the issues with global hotkeys for Linux and Windows, I wrote my library for quick registration hotkeys. The resulting library is called QGlobalShortcut and is available at GitHub under license LGPLv2. The library supports the …

Qt → Qt Linux - Lesson 002. Global HotKey in Linux

Qt, Ubuntu, HotKey, linux, XLib, XCB

Work with the global keyboard hot keys in Windows is a trivial task than Linux, since this has WinAPI prepared methods that do not require a large amount of code. And each hotkey is set in line ID, in which …

Xlib → XKeysymToKeycode

linux, unix, X11, XKeysymToKeycode, Xorg

Name and similar functions

XStringToKeysym, XKeysymToString, XKeycodeToKeysym, XKeysymToKeycode, XConvertCase - convert keysyms

Syntax

KeySym XStringToKeysym(char *string);

char *XKeysymToString(KeySym keysym);
KeySym XKeycodeToKeysym(Display *display, KeyCode keycode, int index);
KeyCode XKeysymToKeycode(Display *display, KeySym keysym);
void XConvertCase(KeySym keysym, KeySym *lower_return, KeySym *upper_return);

Arguments

display …

Xlib → XGrabKey

HotKey, linux, X11, XGrabKey

Syntax

XGrabKey(display, keycode, modifiers, grab_window, owner_events, pointer_mode, keyboard_mode)
      Display *    display;
      int          keycode;
      unsigned int modifiers;
      Window       grab_window;
      Bool         owner_events;
      int          pointer_mode, keyboard_mode;

Arguments

display         // Specifies the connection to the X server.
keycode         // Specifies the KeyCode or AnyKey. …