HBQT-Tutorial

Giovanni Di Maria - calimero22@yahoo.it
since: Feb 12, 2011



Tutorial

Harbour QT Classes

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This Tutorial:
Rev. [1] - February 12, 2011
Rev. [7657] - Apr 21, 2015

Last Updates

• Updated "How to install QtContribs and compile a PRG" - (Rev. [7642])
• Added "How to Distribuite an Application" - (Rev. [7651])
• Added "Games - McDonald's Game" - (Rev. [7654])

Introduction
This tutorial is a brief, continuously updated, of the use of the classes QT with Harbour language. It is specifically written for beginners that initially encountered some difficulties in using these classes, however, extremely powerful and efficient. The approach of the tutorial is different from other guides that are online. It simply focuses a single class or single object, so you do not get lost in the maze of the vast files of examples provided with the product. This will easily learn to manage and plan their individual class, as needed, and, finally, to put "together" the whole.
Giovanni Di Maria

Notes for developers

• In order to make good use of the Qt classes, you should see the include file "hbqtgui.ch"
• You should consult the Digia's offcial documentation
• If possible, you must NOT use static variables
• It is strongly recommended to use hbformat tool to format the .prg sources
• To create a source, you can copy and paste the code into your text editor and save it with .prg extension
• When you connect an object with a Signal, if must be passed as string without spaces.
  Example: oButton1:Connect( "clicked()", { || QApplication():quit() } )
• When you connect an object with a Event, if must be passed as constant.
  Example: oWnd:connect( QEvent_KeyPress , { |k| keypressed( k ) } )

Legal Notices
This tutorial is a free document and will remain free. You can view, use, print and redistribute it and/or modify it, without any limitations.

How to install QtContribs and compile a PRG
QtContribs_Setup.exe is a self archive containing also Harbour. You need only install it to your disk. Follow these steps to install QtContribs and compile your PRG:

• Download last executable version of QtContribs from:
  http://sourceforge.net/projects/qtcontribs/files/?source=navbar
• Install QTContribs in c:\hbqtcontrib391 (or other folder);
• From console type: PATH C:\hbqtcontrib391\bin
• hbmk2 -w3 prova.prg addons\hbqt\qtgui\hbqtgui.hbc

How to Distribuite an Application
To distribuite an application follow the following steps:

• Copy the folder "platforms" to the folder of your application from "C:\hbqtcontrib391\bin"
• Copy your "EXE" to the folder of your application
• Copy "Qt5PrintSupport.dll" to the folder of your application
• Copy "Qt5Core.dll" to the folder of your application
• Copy "libstdc++-6.dll" to the folder of your application
• Copy "icuin53.dll" to the folder of your application
• Copy "icuuc53.dll" to the folder of your application
• Copy "icudt53.dll" to the folder of your application
• Copy "Qt5Gui.dll" to the folder of your application
• Copy "Qt5Widgets.dll" to the folder of your application
• Copy "libgcc_s_dw2-1.dll" to the folder of your application
• Copy "libwinpthread-1.dll" to the folder of your application

QMainWindow - Window
The following example shows how to create a simple main window. The window is resizable.

QMainWindow - Window not resizable
The following example shows how to create a simple main window. The window is NOT resizable.

QMainWindow - Window with fixed width
The following example shows how to create a simple main window. The width is locked and the height is resizable.

QMainWindow - Window with Fixed height
The following example shows how to create a simple main window. The height is locked and the width is resizable.

QMainWindow - Blinking Title Bar
The following example shows how to create a blinking title bar.

QMainWindow - Colored Window (QSS)
The following example shows how to create a colored main window, using QSS.

QMainWindow - Colored Window (QPalette)
The following example shows how to create a colored main window, using Qpalette.

QMainWindow - Window with background
The following example shows how to create a window with a background from an image.

QMainWindow - Window as Splash Screen
The following example shows how to create a Splash Screen Window. There is NO border. The windows is closed by pressing on it.

QMainWindow - Colored Window (QSS) with a gradient
The following example shows how to create a colored main window, with a gradient, using QSS.

QMainWindow - Retrieve version of Harbour, GCC and QT
The following example shows how to retrieve informations from compilers used.

QWidget - Widgets in a Main Window
The following example shows how to create some widgets in a main window. The widgets contain buttons. If you have to move the buttons, simply move the widget only. The Main Window is the parent of the widgets. The widgets are the parent of the buttons.

QApplication - Beep
The following example shows how to create a simple main window, as application. At exit, the application produces a beep. This method sounds the bell, using the default volume and sound. The function is not available in Qt for Embedded Linux.

QApplication - Quitting from application
The following example shows how to quit from an application, using a method.

QIcon - Widget with Icon
The following example shows how to add an icon to a widget.

QDateEdit - Editing a date
The following example shows how to enter and edit a date.

QDateEdit - Editing a date and displaying the week day
The following example shows how to enter and edit a date. The program shows also the week day of the date.

QDateEdit - How to show current date
By default QDateEdit shows the date 01/01/2000. You can show the actual date using setdate() function.

QTimeEdit - Editing the time
The following example shows how to enter the time.

QCalendarWidget - Simple Calendar
The following example shows how to create a simple window containing a calendar.

QCalendarWidget - Interactive Calendar
The following example shows how to create a simple window containing an interactive calendar. The buttons allow to navigate through the months and to show or hide the grid.

QCalendarWidget - Setting a date
This example shows how to set any date in the calendar.

QLabel - Text Label
The following example shows how to create a simple main window with a label, used as text string.

QLabel - Image
The following example shows how to view an image, using the QLabel class.

QLabel - Colored Text Label (QSS)
The following example shows how to create a simple main window with a label used as text string. The label is colored using QSS.

QLabel - Colored Text Label (QPalette)
The following example shows how to create a simple main window with a label used as text string. The label is colored using QPalette.

QLabel - Colored Text Label (HTML)
The following example shows how to create a simple main window with a label used as text string. The label is colored and formatted using HTML.

QLabel - Circular Label
The following example shows how to create a circular label. The label is colored and formatted using QSS.

QLabel - Horizontal line
The following example shows how to simulate a horizontal line. A good solution is to create a label with a thickness of 1 or 2 pixels.

QLabel - Vertical line
The following example shows how to simulate a vertical line. A good so- lution is to create a label with a thickness of 1 or 2 pixels.

QLabel - Grid of lines
The following example shows how to simulate grid of lines. A good solution is to create two arrays of labels, with a thickness of 1 or 2 pixels. The first array is used for horizontal lines, the second array is used for vertical lines.

QLabel - Modify the Frames
The following example shows how to change the frame of the labels.

QLabel - Alignment
The following example shows how to align a text in a QLabel.

QLabel - Setting a number
The following example shows how to set a number in a QLabel, without the use of strings.

QLabel - Rectangle
The following example shows how to create a green rectangle with a QLabel.

QLabel - Showing an image from Internet
The following example shows how to view an image from Internet. You can download the image from Internet and store it into your hard disk. Then you can show it as a local image. You have to link the program against hbtip library.

QMessageBox - Message Box (simple)
The following example shows how to create a simple window with an active button. If the button is pressed, a message box appears.

QMessageBox - Message Box (Yes and No buttons)
The following example shows how to create a simple window with the Yes and No button. If the Yes button is pressed, the window title changes.

QPushButton - Simple button
The following example shows how to create a simple button. If pressed, the window will be resized.

QPushButton - Button with icon
The following example shows how to create a simple button with a icon. If pressed, the title bar changes.

QPushButton - Buttons
The following example shows how to create a simple window with two active buttons. If the first button is pressed, the window closes. If the second button is pressed, the title of the window changes his value.

QPushButton - Array of Buttons
The following example shows how to create many buttons, stored in an array. The buttons have no actions.

QPushButton - Array of Buttons with variable dimensions
The following example shows how to create many buttons, stored in an array. Their dimension is set by an incremental variable.

QPushButton - Button Tips
The following example shows how to create a button with the tip.

QPushButton - Button that plays a Wav file
The following example shows how to create a button to miaow a cat.

QPushButton - Array of Buttons that change the title bar (1)
The following example shows how to create many buttons, stored in an array. Every button changes the title bar, showing its progressive number. This example does not use the macro.

QPushButton - Array of Buttons that change the title bar (2)
The following example shows how to create many buttons, stored in an array. Every button changes the title bar, showing its progressive number. This example uses the macro. It uses also a PRIVATE variable. The use of MEMVAR, PUBLIC or PRIVATE variables is a very bad practice and no (new) component should ever _require_ such practice.

QPushButton - Array of Buttons that change the title bar (3)
The following example shows how to create many buttons, stored in an array. Every button changes the title bar, showing its progressive number. This example does not use the macro. The buttons are created in a FOR loop, but the Connection is created manually, one for each button.

QStatusBar - Status Bar
The following example shows how to create and modify the status bar, at the bottom of the window.

QStatusBar - Status Bar and time clock
The following example shows how to show a clock on the status bar, at the bottom of the window.

QStatusBar - Status Bar Ping Pong
The following example shows how create a status bar with a ping pong effect. The status bar goes to left and right.

QStatusBar - Colored Status Bar
The following example shows how to create and modify a colored status bar, at the bottom of the window.

QStatusBar - Status Bar with timeout
The following example shows how to display a status bar for "n" milliseconds and then it desappears. The value of timeout is expressed in milliseconds.

QStatusBar - Multiple Status Bar
The following example shows how to create a status bar composed by several widgets.

QStatusBar - Status Bar and Progress Bar
The following example shows how to add a progress bar to the status bar.

QStatusBar - Comboboxes in the Status Bar
The following example shows how to add comboboxes to the status bar.

QCursor - Cursor Managing
The following example shows how to modify the cursor of the mouse, over widgets.

QTabWidget - TAB Control
The following example shows how to create three Tab Widget.

QTabWidget - TAB Controls in a TAB Control
The following example shows how to create many Tab Widgets in three Tab Widgets.

QTimer - Timer
The following example shows a clock every 1 second, thank to QTimer class. The time of refresh can be adjusted by the start(x) property.

QTimer - Timer with controls
The following example shows a clock every a second, thank to QTimer class. The time of refresh can be adjusted by the start(x) property. If the Start button is pressed, the time is updated every a second. If the Stop button is pressed, the time stops.

QTimer - Timer in the Window Title
The following example shows a clock on the Title bar of a window.

QTimer - Scrolling text
The following example shows how to create a scrolling text, using qTimer class. The scrolling text is a text in a label. Every 100 milliseconds, this string is updated, by removing the first character and putting it at the end of the string. This gives the illusion of the scrolling.

QTimer - Countdown
The following example shows how to create a program for a countdown. The time starts from 60 seconds. Pressing the "start" button, the countdown starts. You can press the "start" button anytime.

QSS - QSS Style Sheet
The following example shows how we can use CSS to change any property of objects.

QSS - Gradient (linear: top to bottom)
The following example shows how we can use CSS to change any property of objects. In particular it shows the creation of a linear gradient.

QSS - Gradient (linear: left to right)
The following example shows how we can use CSS to change any property of objects. In particular it shows the creation of a linear gradient.

QSS - Gradient (linear: left-top to right-bottom)
The following example shows how we can use CSS to change any property of objects. In particular it shows the creation of a linear gradient.

QSS - Radial Gradient
The following example shows how we can use CSS to change any property of objects. In particular it shows the creation of a radial gradient.

QSS - Colored QLCDNumber
The following example shows a colored QLCDNumber by QSS.

QMenu - Menu
The following example shows the usage of menu. Every item can be connected to any function or UDF.

QMenu - Menu with separators
The following example shows the usage of menu. An item can separated from the other by a line separator. Every item can be connected to any function or UDF.

QMenu - Menu and sub-menu
The following example shows the usage of menu and sub-menu. The sub-menu is also a menu.

QMenu - Colored Menu
The following example shows the usage of a colored menu. Every item can be connected to any function or UDF.

QMenu - A complex Menu
The following example shows how to create a complex menu.

UI - UI file created with QT Creator

UI - A fully functional example with UI file
The following example uses a file .UI created with QT Creator program. Pressing the button, the title changes.

1. You must create the file "form.ui" (or other name) with QT Creator
2. You must include the "form.ui" file in the compilation (directly or in the file .HBP)
3. To refer to children of the widget, you must "rename" the objects with "q_" at the beginning of the line. For example: q_pushButton
4. The "form.ui" file is not necessary for the execution of the program. It's compiled in the .exe file
5. If the name of the .UI file is "form.ui", then you must call the hbqtui_form() function. If the name of the .UI file is "example.ui", then you must call the hbqtui_example() function.

QTableWidget - Simple table
The following example shows how to create a small table, with 2 rows and 2 columns.

QTableWidget - Arithmetic tables
The following example shows how to create an Arithmetic table, with 100 rows and 4 columns. The first column contains the number, the second column contains the square of the number, the third column contains the square root of the number and the fourth column contains the cube of the number. The numbers are generated by a loop.

QTableWidget - Colored Cells
The following example shows how to create a small table, with 2 rows and 2 columns. The cells are colored.

QTableWidget - Arithmetic tables (colored columns)
The following example shows how to create an Arithmetic table, with 100 rows and 4 columns. The first column contains the number, the second column contains the square of the number, the third column contains the square root of the number and the fourth column contains the cube of the number. The numbers are generated by a loop. The columns are colored.

QTableWidget - Arithmetic tables (conditional coloring of rows)
The following example shows how to create an Arithmetic table, with 100 rows and 4 columns. The first column contains the number, the second column contains the square of the number, the third column contains the square root of the number and the fourth column contains the cube of the number. The numbers are generated by a loop. The rows are colored following a condition (even and odd).

QTableWidget - Sorting colums
The following example shows how to sort the colums in a table, by pressing the respective buttons.

QTableWidget - Alternate colors of rows
The following example shows how to color alternating rows, using setAlternatingRowColors function.

QInputDialog - Input Dialog window
The following example uses a input dialog window to insert values into the program.

QColorDialog - Color Dialog
The following example shows how to use a color dialog to change the color of a text label.

QProgressBar - Progress Bar
The following example shows use of a progress bar. It' useful during a long counting or elaboration of big archives.

QProgressBar - Progress Bar in a widget
The following example shows use of a progress bar in a widget.

HTML - Tag HTML
The following example shows how to use tag HTML to change the color, size and aspect of text of other objects.

HTML - Tag HTML
The following example shows how to use tag HTML, like ordered list, text formatting and break row.

HTML - Tag HTML and Images
The following example shows how to insert an image with the IMG tag HTML.

HTML - Tag HTML and subscript
The following example shows how to use a subscript with the text.

QSlider - Slider with value
The following example shows a slider that changes the value of a Lcd display. Values are between 0 and 99.

QSlider - Sliders RGB
The following example uses three sliders to change the RGB color of a text.

QSlider - Sliders synchronization
The following example shows how to synchronize two sliders, so that moving a slider, it moves the other.

QDial - Simple Wheel
The following example uses a QDial control, to modify any value. It is a beautiful control and it can be used in many occasions.

QDial - Wheel with a LCD Display
The following example uses a QDial control, to modify the value in a LCD display.

QSpinBox - Spin Control
The following example uses a spin control, to modify the size of a text. Values can be typed or chosen with the arrows.

QComboBox - ComboBox
The following example creates a combobox, with many items. User can select any item.

QComboBox - ComboBox with Update
The following example creates a combobox, with many items. User can select any item. When selected, it's shown in a label.

QComboBox - Populating a ComboBox from a DBF
The following example creates a combobox, with many items. The items are appended from a DBF database.

QFontComboBox - ComboBox with Fonts
The following example creates a combobox, with a set of system fonts. The text is changed with the selected font.

QLCDNumber - LCD Display
The following example creates a nice LCD display, to view numbers. It's properties can be changed.

QLCDNumber - LCD with number in decimal, binary, hexdecimal and octal base
The following example creates four LCD displays, that display a number in four bases: decimal, binary, hexdecimal and octal. The number is changed by a Spin Box.

QLCDNumber - Colored LCD Display
The following example creates three nice colored LCD displays.

QLCDNumber - How to display numbers and text
Digits and other symbols can be shown: 0/O, 1, 2, 3, 4, 5/S, 6, 7, 8, 9/g, minus, decimal point, A, B, C, D, E, F, h, H, L, o, P, r, u, U, Y, colon, degree sign (which is specified as single quote in the string) and space.

QLCDNumber - Digital clock with LCD
The following example shows how to create a real time digital clock.

QRadioButton - Radio Buttons
The following example shows how to use a radio button, with three options. Every option is connected to a function.

QRadioButton - Radio Buttons and images
The following example shows how to use a radio button, with three options. Every option is connected to a function, showing an image.

QVBoxLayout - Vertical Layout
The following example uses the vertical layouts, to place controls without to specify any position. The placing and position is automatic.

QHBoxLayout - Horizontal Layout
The following example uses the horizontal layouts, to place controls without to specify any position. The placing and position is automatic.

QLineEdit - Line Edit
The following example uses a line edit, to insert and view any data.

QLineEdit - Array of Line Edit
The following example uses many line edits, stored in an array, to insert and view data.

QLineEdit - Merging two Line Edits
The following example uses two line edits, to insert and view data. By pressing the button, the values of the two Line Edits are merged and added to a third Line Edit.

QLineEdit - Resetting Line Edits
The following example shows how to reset and clear line edits.

QLineEdit - Password
The following example shows how to insert a password into a line edit. The asterisks will be shown instead of the characters actually entered.

QLineEdit - Order of inputs
The following example shows how to change the order of tabulation, simply changing the position of QLineEdit objects, in the source file.

QLineEdit - Set Input Mask
The following example shows how to set a mask in a QLineEdit, to filter the characters inserted. The input mask is similar to PICTURE in @ SAY ... GET command.

QLineEdit - How to Hide and Show a line edit
The following example shows how to to hide and show a line edit, using a button. Also the label of the button changes, if it's pressed.

QLineEdit - Navigating with UP/DOWN keys
By default you can navigate across QLineEdits by TAB key. This example shows how to change this behavior, using UP and DOWN cursor keys.

QTextEdit - Rich Text Editor
The following example shows a Rich Text editor and sets his text to bold, italic and size 20, color blue.

QTextEdit - Ascii Art
The following example shows how to draw with Ascii Art in a QTextEdit. The font used must be "Courier". The drawing is stored in a string.

QEvent Close
The following example shows how to intercept the Close Event. In this example, the close window button is ignored and you can exit from the window with the user button ("Quit") only .

QEvent KeyPress
The following example shows how to capture a key pressed. The even can capture also Shift, Alt and Ctr keys.

QEvent KeyPress
The following example shows how to move a window by pressing the arrow keys.

QEvent Move
The following example shows how to intercept the event of moving the window.

QEvent Resize
The following example shows how to intercept the event of resizing the window. The objects in the window are resized and repositioned proportionally.

QPainter - Drawing a face
The following example shows how to draw a face with primitives, like circles and lines. This source uses the class QPainter.

QPainter - Moving a face
The following example shows how to draw and move a face with buttons. This source uses the class QPainter.

QPainter - Saving a picture
The following example shows how to save a picture to BMP and PNG files. The picture is not visible on the screen.

QTreeView - The Tree of directories and folders
The following example shows how to create a tree of the directories of your storage media. When you click on a file or folder, its name is shown in a text label.

QResource - How to use Resources
The following example shows how to use the resource files. You can use images and compile them in the executable file, so you can distribuite the exe file, without the images. You need, for this example, the following files:

• elektrosoft.prg
• elektrosoft.hbp
• elektrosoft.qrc
• logo.png

QScrollArea - Very simple scrolling area
The following example shows how to create a simple scrolling area. The area can contain any object. In this example, the label contains an image and the scroll area contains the label. The image is composed of 1200x860 pixels (in this example). You can scroll the image using scrolling bars.

QDialog - A modal window (1)
This example shows how to create a modal window, using the "setmodal()" and "show()" functions.

QDialog - A modal window (2)
This example shows how to create a modal window, using only the "exec()" slot.

QToolBar - A simple textual Tool Bar
This example shows how to create a simple Tool Bar, without icons. You can drag the toolbar.

QToolBar - A simple textual Tool Bar with separator
This example shows how to create a simple Toolbar, without icons. The toolbar has a separator.

QToolBar - A toolbar with icons, actions and tooltips
This example has a toolbar with two icons. Pressing them, the main windows changes its size. The actions have a tooltip.

QToolBar - Draggable toolbar
This example shows how to create a draggable toolbar.

QFileDialog - Very simple File Dialog
This example shows how to create a very simple File Dialog.

QFileDialog - A viewer for text files
This example shows how to create a viewer for text files. User can choose the folder and the file. It will be shown on the screen.

QFileDialog - A viewer for BMP and PNG
This example shows how to create a viewer of BMP and PNG images. User can choose the folder and the file. It will be shown on the screen.

QCheckBox - Simple checkboxes
This example shows how to create checkboxes.

QCheckBox - Exclusive checkboxes
This example shows how to create exclusive checkboxes.

QCheckBox - How to set a checkbox
This example shows how to set a checkbox.

QSAY, QGET, QREAD and friends - Input form
You can use new classes QSAY, QGET and QREAD to build an entry form in a similar-Clipper language. This forms accepts string data.

QSAY, QGET, QREAD and friends - Input form
You can use new classes QSAY, QGET and QREAD to build an entry form in a similar-Clipper language. This forms accepts numerical and string data. The dimension of the form depends from the position of the controls.

QSAY, QGET, QREAD and friends - Input form
You can use new classes QSAY, QGET and QREAD to build an entry form in a similar-Clipper language. This forms accepts numerical data.

QSAY, QGET, QREAD and friends - Input form with PICTURE
You can use new classes QSAY, QGET and QREAD to build an entry form in a similar-Clipper language. This forms accepts numerical data. The GETs clauses use PICTURE mask.

QSAY, QGET, QREAD and friends - How to change the title bar
You can change the title bar using the TITLE of QREAD.

QSAY, QGET, QREAD and friends - How to change the title bar
You can change the title bar using the PROPERTIES of QREAD.

QSAY, QGET, QREAD and friends - Colored GETs
You can change the color of the GET like Clipper language.

QSAY, QGET, QREAD and friends - Push Button
This code shows how to create a push button.

QSAY, QGET, QREAD and friends - Checkbox
This code shows how to create a Checkbox.

QSAY, QGET, QREAD and friends - Display a text
This code shows how to display a text, using SAY clause.

QSAY, QGET, QREAD and friends - Valid
This code shows how to validate the input fields.

QSAY, QGET, QREAD and friends - When
This code shows how to input a field for a specific condition.

QSAY, QGET, QREAD and friends - Memoedit
This code shows how to edit a text string in a "memo" field.

QSAY, QGET, QREAD and friends - Many colors
This code shows how to use many colors in the GET clause, with the function RGB.

QSAY, QGET, QREAD and friends - Listbox
This code shows how to implement a listbox as field.

QSAY, QGET, QREAD and friends - Combobox
This code shows how to implement a combobox as field.

QSAY, QGET, QREAD and friends - Setfocus
This code sets the focus to Fourth field if you press the button "Focus".

QSAY, QGET, QREAD and friends - Changing a field
This code assigns the value "Giovanni" to Fourth field if you press the button "Assign".

QSAY, QGET, QREAD and friends - Area of rectangle (accessing directly to GETLIST array)
This code calculates the area of a rectangle when you press the button "Calculate".

QSAY, QGET, QREAD and friends - Area of rectangle (accessing to GETLIST by "name" of variable)
This code calculates the area of a rectangle when you press the button "Calculate".

Games - Game of Colors
This is a game where the player must find the exact color randomly chosen by computer. The color is chosen by three slider of the RGB colors (red, green, blue). Player can get an hint from the computer. The maximum score is 765. Have fun.

Games - Game of the Dog and the Cat (with boxes)
This is a nice game where the player is a dog (the red square). The dog must take the cat (the blue square). Every time that the dog takes the cat, the score increments its value by 1. The dog is moved by pressing arrow keys. Have fun.

Games - Game of the Dog and the Cat (with images)
This is a nice game where the player is a dog. The dog must take the cat. Every time that the dog takes the cat, the score increments its value by 1. The dog and the cat are real bitmap images. The dog is moved by pressing arrow keys. Have fun.

Games - Game of the Dog and the Cat (with images and sound)
This is a nice game where the player is a dog. The dog must take the cat. Every time that the dog takes the cat, the score increments its value by 1 and the cat meows. The dog and the cat are real bitmap images. The dog is moved by pressing arrow keys. Have fun.

Games - Dice Game (1 die)
This is a nice game where the player play with one die.

Games - Dice Game (6 dice)
This is a nice game where the player play with six dice. The dice are stored in a vector.

Games - McDonald's Game
This is a nice game where the player must take the sandwich, the coke and the potato chips. Player can choice the hero and he can set the speed of game and its duration.

Sample Applications - Difference between two dates
The following example calculates the difference betwee two dates. The user must type two dates and then press the Calculate button. The program shows the difference, in days.

Sample Applications - Radio Simulation (Visual only)
The following example simulates a simple radio receiver. It's visual only, of course. I use labels to draw the window tuning and the cursor of sintony.

Sample Applications - Area and perimeter of a rectangle
The following example calculates the area and the perimeter of a rectangle. Input data are typed by user.

Sample Applications - Alarm
The following example shows how to create a simple programmable alarm.

Sample Applications - Resistors
The following example shows a program to calculate the value of a resistor. It show also the colors of its bars.

Sample Applications - Aquarius
The following example shows how to create a virtual aquarius with fishes. The fishes move from side to side. The fishes are in .PNG format image, with transparency.

Sample Applications - Semaphore (automatic)
The following example shows how to create an automatic semaphore. It changes its color every a second.

Sample Applications - Semaphore (manual)
The following example shows how to create a manual semaphore. It changes its color if the button is pressed.

Sample Applications - Scrolling titles
The following example shows how to create scrolling titles, like movie titles. Them scroll up and shows some image, too.

Sample Applications - Televideo Teletext
The following example shows the page 101 of Italian Teletext Service (Televideo). This page shows last news in Italy and in the World. The program searches for a new page every 30 seconds.

Sample Applications with Databases - DBF Database Append Record
The following example shows how to store data into a DBF database. Pressing the Save button, the data are saved into a DBF, thank to REPLACE command.

Sample Applications with Databases - DBEdit simulation
The following example shows how to simulate the DbEdit function to browse a DBF. The fields and records cannot be changed but only viewed.

Sample Applications with Databases - Flags and Database
The following example shows flags on a form. The flags are stored in a DBF archive. User can browse data by the "prev" and "next" buttons.

Sample Applications with Databases - Navigating in a DBF
The following example shows how to navigate in a DBF archive. User can browse data by the "prev" and "next" buttons. Some objects are STATIC to use them in external functions.

Appendix A - Photos

Appendix B - Contributors

• Giovanni Di Maria (he is still the main developer)
• Marco Braida
• Massimo Belgrano
• Mario Wan Stadnik (Qatan)
• Apolinar
• Aleksander Czajczynski

Appendix C - What users think

• Sounds good! (Viktor Szakats)
• Thanks again for your nice tutorial. (Viktor Szakats)
• It's very nice job, thanks for this tutorial. (Viktor Szakats)
• As said earlier it is a noble initiative and will stir a lot of enthusiam for Harbour users. (Pritpal Bedi)
• Thanks for your great initiative providing that important tutorial. It is encouraging me to try HBQT and I found it is not as diffcult as I first thought. Thanks for your help. Regards. (Qatan)
• Thank you Giovanni for the tutorial. (Guy Roussin)
• Complimenti Giovanni il tuo lavoro del quale riporto per comodita' il link diretto. E' utilissimo... grazie per la condivisione... (Marco Braida)
• Thanks a lot Giovanni! (Maurilio Longo)
• That said, I really appreciate your tutorial! (Maurilio Longo)
• I think your tutorial's link should be loaded on harbour's web page. (Angel Pais)
• Many thanks for your great work. (Shum)
• Congratulations for nice contribuition. (Itamar M. Lins Jr. Lins)
• Dear Giovanni: Thank you for the tutorial of hbqt. It is very useful for me. Best regards. (Daniel Tello Argentina)
• Imo this tutorial is good also as offcial harbour doc. (Massimo Belgrano)
• It's great service for whole Harbour community. Well done and keep it up. Also a great example for how to contribute. (Viktor Szakats)
• Hi Giovanni, magnificent tutorial. Many thanks. (Claudia Neumann)
• Hi. I am having fun with hbqt and understand most of the excellent tutorial examples from Giovanni Di Maria. Thanks for that! I do however find the qt4 documentation quite daunting and ask for some help/further examples to do with events. (Charlesg)
• Thank you for your diligent effort on your tutorial on Harbour QT. Each example is very easy to understand the way you present them. I have learned quite a lot from them and can envision how to utilize them. Once again I thank you for the tutorial. (Gabriel Zippilli - USA)
• Tnx, for your work. (Antonio Montagut)
• Hi Giovanni. Very good, your samples are the best "appetizers" for QT programming I've ever seen. (Viktor Szakats)
• FWQT tutorial is based on excellent Giovanni Di Maria's HBQT tutorial. (Antonio Linares)
• Your tutorial is really fantastic and invites to explore QT, thanks! :-). (Antonio Linares)
• Ya tengo el browse de mi .dbf, ahora a tunearlo a mi gusto, mil gracias, no hubiese podido hacer mucho sin tu tutorial !!! (Fermín Barboza)
• Great tutorial! ;-)) (Patrick Mast)
• Excelente introduccion!... Gracias!! (Carlos Omran)
• Hello Giovanni. I just discovered your manual and I am immensely grateful for this, congratulations. Excellent contribution. Best Regards, Edgar San. (Edgar Lee)
• Many thanks for this tutorial. Cheers. (Luigi Ferraris)

Appendix D - Communities

• Facebook Group HbQt
• Google QtContribs Group
• Google Harbour Developers Group