Using Intel® Visual Fortran to Create and Build Windows*-Based Applications

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ID 757211
Date 7/23/2021
Public
Document Table of Contents
Document Table of Contents x
Using Intel® Visual Fortran Compiler to Create and Build Windows*-Based Applications
Using Intel® Visual Fortran Compiler to Create and Build Windows*-Based Applications x
Legal Information Introduction Creating Windowing Applications Creating and Using DLLs Using QuickWin Using Dialog Boxes for Application Controls
Introduction x
Notational Conventions Related Information
Creating Windowing Applications x
Understanding Coding Requirements for Fortran Windowing Applications Using Menus and Dialogs in SDI and MDI Fortran Windowing Applications Sample Fortran Windows Applications Advanced Graphics Using OpenGL
Creating and Using DLLs x
Coding Requirements for Sharing Procedures in DLLs Coding Requirements for Sharing Data in DLLs Building Dynamic-Link Libraries Building Executables that Use DLLs
Using QuickWin x
Special Naming Convention for Certain QuickWin and Windows* Graphics Routines Comparing QuickWin with Windows*-Based Applications Using Windows API Routines with QuickWin Types of QuickWin Programs The QuickWin User Interface USE Statement Needed for Fortran QuickWin Applications Creating QuickWin Windows Using QuickWin Graphics Library Routines
Types of QuickWin Programs x
Fortran Standard Graphics Applications Fortran QuickWin Graphics Applications
The QuickWin User Interface x
Default QuickWin Menus
Creating QuickWin Windows x
Accessing Window Properties Creating Child Windows Giving a Window Focus and Setting the Active Window Keeping Child Windows Open Controlling Size and Position of Windows
Using QuickWin Graphics Library Routines x
Selecting Display Options Checking the Current Graphics Mode Setting the Graphics Mode Setting Figure Properties Understanding Coordinate Systems Adding Color Writing a Graphics Program Displaying Graphics Output Storing and Retrieving Images Customizing QuickWin Applications QuickWin Programming Precautions Simulating Nonblocking I/O
Understanding Coordinate Systems x
Text Coordinates Graphics Coordinates Setting Graphics Coordinates Real Coordinates Sample Program
Adding Color x
Color Mixing VGA Color Palette Using Text Colors
Writing a Graphics Program x
Activating a Graphics Mode Drawing Lines on the Screen Drawing a Sine Curve Adding Shapes
Displaying Graphics Output x
Drawing Graphics Displaying Character-Based Text Displaying Font-Based Characters Using Fonts from the Graphics Library
Using Fonts from the Graphics Library x
Available Typefaces Initializing Fonts Setting the Font and Displaying Text SHOWFONT.F90 Example
Storing and Retrieving Images x
Transferring Images in Memory Loading and Saving Images to Files Editing Text and Graphics from the QuickWin Edit Menu
Customizing QuickWin Applications x
Enhancing QuickWin Applications Controlling Menus Changing Status Bar and State Messages Displaying Message Boxes Defining an About Box Using Custom Icons Using a Mouse
QuickWin Programming Precautions x
Using Blocking Procedures Using Callback Routines
Using Dialog Boxes for Application Controls x
Using the Resource Editor to Design a Dialog Box Writing a Dialog Application Summary of Dialog Routines Understanding Dialog Controls Using Dialog Controls Using ActiveX* Controls
Using the Resource Editor to Design a Dialog Box x
Setting Control Properties Including Resources Using Multiple Resource Files The Include (.FD and .H) Files
Writing a Dialog Application x
Initializing and Activating the Dialog Box Using Dialog Callback Routines Using a Modeless Dialog Box Using Fortran AppWizards to Help Add Modal Dialog Box Coding Using Fortran AppWizards to Help Add Modeless Dialog Box Coding Using Dialog Controls in a DLL
Understanding Dialog Controls x
Using Control Indexes Available Indexes for Each Dialog Control Specifying Control Indexes
Using Dialog Controls x
Using Static Text Using Edit Boxes Using Group Boxes Using Check Boxes and Radio Buttons Using Buttons Using List Boxes and Combo Boxes Using Scroll Bars Using Pictures Using Progress Bars Using Spin Controls Using Sliders Using Tab Controls Setting Return Values and Exiting
Using ActiveX* Controls x
Using the Resource Editor to Insert an ActiveX Control Using the Intel® Fortran Module Wizard to Generate a Module Adding Code to Your Application Registering an ActiveX Control
Using Intel® Visual Fortran Compiler to Create and Build Windows*-Based Applications

Using Blocking Procedures

Procedures that block execution of the program until a given event occurs, such as READ or WAITONMOUSEEVENT, both of which wait for user input, are called blocking procedures. QuickWin child processes can contain multiple callback routines; for example, a different routine to be called for each menu selection and each kind of mouse-click (left button, right button, double-click, and so on).

Problems can arise when a process and its callback routine, or two callback routines within the same process, both contain blocking procedures. This is because each QuickWin child process supports a primary and secondary thread.

As a result of selecting a menu item, a menu procedure may call a blocking procedure, while the main thread of the process has also called a blocking procedure. For example, say you have created a file menu, which contains an option to LOAD a file. Selecting the LOAD menu option calls a blocking function that prompts for a filename and waits for the user to enter the name. However, a blocking call such as WAITONMOUSEEVENT can be pending in the main process thread when the user selects the LOAD menu option, so two blocking functions are initiated.

When QuickWin has two blocking calls pending, it displays a message in the status bar that corresponds to the blocking call first encountered. If there are further callbacks with other blocking procedures in the two threads, the status bar may not correspond to the actual input pending, execution can appear to be taking place in one thread when it is really blocked in another, and the application can be confusing and misleading to the user.

To avoid this confusion, you should try not to use blocking procedures in your callback routines. QuickWin will not accept more than one READ or INCHARQQ request through user callbacks from the same child window at one time. If one READ or INCHARQQ request is pending, subsequent READ or INCHARQQ requests will be ignored and -1 will be returned to the caller.

If you have a child window that, in some user scenario, might call multiple callback routines containing READ or INCHARQQ requests, you need to check the return value to make sure the request has been successful, and if not, take appropriate action, for example, request again.

This protective QuickWin behavior does not guard against multiple blocking calls through mouse selection of menu input options. As a general rule, using blocking procedures in callback routines is not advised, since the results can lead to program flow that is unexpected and difficult to interpret.

Parent topic: QuickWin Programming Precautions
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