Adding handlers with class wizard, Visual Basic Programming

Assignment Help:

Adding Handlers With Class Wizard:

Whenever a handler is added, the class wizard places the prototype for the message handler in the header (.H) file. It gives a skeleton handler in the implementation file (.cpp) in the class that is placed in the base class combo box. It also adds the messagemap entry which connects the message and the handler in the implementation file. For illustration, for the WM_LBUTTONDOWN message, the prototype afx_msg void OnLButtonDown( UINT nFlags, CPoint point) is inserted in the header (.H) file by the class wizard. The class wizard includes the skeleton handler in the implementation file (.cpp). The skeleton handler would look as shown below:

void CAppView :: OnLButtonDown( UINT nFlags, CPoint point)

Also the class wizard inserts an entrance in the Message_Map macro.

BEGIN_MESSAGE_MAP( CAppView, CView)

.

.

ON_WM_LBUTTONDOWN()

.

.

END_MESSAGE_MAP()


Related Discussions:- Adding handlers with class wizard

Variant subtypes, Beyond the simple string or numeric classifications, Vari...

Beyond the simple string or numeric classifications, Variant can make added distinctions regarding the specific nature of numeric information. For instance, you can have numeric in

Three models for user interface design, THREE MODELS FOR USER INTERFACE DES...

THREE MODELS FOR USER INTERFACE DESIGN   The 3 models for the user interface design are the implementation model, mental model &the manifest model. The Implementation Mod

Displaying a file with scrolling - document class, Displaying a file With S...

Displaying a file With Scrolling: To display a file with the scrolling option allows the steps as shown below: 1. Generate a SDI application. 2. In the Step 6 of the App

Explain class module and standard module, Difference between Class Module a...

Difference between Class Module and Standard Module? Standard module: -This place for variable declarations,procedures etc.& it can accessed these procedures in whereve

Coding, Write an event procedure to automate the billing system of a superm...

Write an event procedure to automate the billing system of a supermarket. Give the details of database tables, forms, controls and menu design (if any). Make assumptions, wherever

Objective of vb script, The objective of this unit is to describe the basic...

The objective of this unit is to describe the basics of VBScript. After completing this unit, you will be capable to write code for Web pages via VBScript. You will be able to unde

Associating images to toolbars - visual basic, Associating Images to Toolba...

Associating Images to Toolbars: 1. Add an Image list to your form from the tool box. 2. Pick the custom property of the image list. 3. Click the images tab. 4. Select

Device contexts - windows programming, Device Contexts: The Device Con...

Device Contexts: The Device Context (DC) is represented by the data type Handle to Device Context (HDC). The HDC is a handle to somewhat you can draw on; it can be the whole s

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd