Displaying a file with scrolling - document class, Visual Basic Programming

Assignment Help:

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 Appwizard inherit the CScrollView as the base class scrolling code will be inserted by the Appwizard in on initial update () function in the View implementation file.

3. Type the coding as shown beow in the Serialize else part.

unsigned int n=ar.GetFile()->GetLength();

str=new char[n];

ar.Read(str,n);

UpdateAllViews(NULL);

Generate a global string char * str in the document class.

To generate the global data click on the ClassView tabpage.

Expand the tree control of the classes.

Choose the CStoreDoc class

Right click and choose the add member variable

Specify the type as the char and variable name as the *str

4. Type the below code in OnDraw() in View.cpp

pDC->DrawText(pDoc->str,CRect(0,0,1000,1000),DT_LEFT);

CScrollDoc* pDoc = GetDocument();

The GetDocument() function returns a pointer to the document class using that we access the member str defined in the document class.

5. Override the OnUpdate() function in the view class.

To Override the OnUpdate(), the function invoke the class wizard by using CTRL+W. For the view object id click OnUpdate() under messages and then say add function. Move the scrolling code from an initial update() to OnUpdate(). YourOnUpdate() function should look as shown  below:

OnUpdate()

{

CClientDC dc(this);

CScrollDoc* pDoc = GetDocument();

int i=dc.DrawText(pDoc->str,CRect(0,0,1000,1000),DT_CALCRECT);

The height of the rectangle is returned by DT_CALCRECT containing the text and it doesn't draw.

// scrolling code to CScrollView

CSize sizeTotal;

// TODO: compute the total size of this view

sizeTotal.cx = sizeTotal.cy = i;

SetScrollSizes(MM_TEXT, sizeTotal);

Invalidate(TRUE);

}

The UpDateAllViews(NULL) in the Document implementation file calls the OnUpdate() function in the view class.Control gets transferred to OnDraw() due to the Invalidate(TRUE).

6. Construct and execute the project.

7. The File dialog that is a modal dialog would be displayed.

8. Choose the File Open and select the file by clicking on the file and then say open.

9. Now you'll examine that the scroll bar is introduced and you can scroll and see all the pages.


Related Discussions:- Displaying a file with scrolling - document class

Introduction to visual c++ programming, INTRODUCTION to VISUAL C++ PROGRAMM...

INTRODUCTION to VISUAL C++ PROGRAMMING This section introduces you to develop the applications using VC++. The Single document interface (SDI), multiple document interface (MDI

Steps for creating a multiple document interface (mdi) form, Steps for Crea...

Steps for Creating A MDI Form: 1. Build a new form and set IsMdiContainer property to true. 2. Build a child form class to add to the form. 3. Now Right click the proj

Introduction to controls and toolbars, INTRODUCTION TO CONTROLS AND TOOLBAR...

INTRODUCTION TO CONTROLS AND TOOLBARS The Visual Basic programming is an event driven programming. In the form objects the termed controls are placed. We can put the properties

Create a visual basic application to play Hangman game, Create a Visual Bas...

Create a Visual Basic that allows a user to play a variation of Hangman. User Inputs The user types a letter into the textbox.   Functional Items 1. Read a

Event-driven programming - windows programming, Event-Driven Programming: ...

Event-Driven Programming: The Event-driven programming allows the program to react to various inputs or events.   The action on a graphical component is an event. For il

How to, need general help in pseudo code

need general help in pseudo code

Create an application for hospital management, 1.   Make project in Visual ...

1.   Make project in Visual Studio 2008. 2.   Controller Class is used for functioning. 3.   Login Form where three people can login like manager, staff and receptionist we c

Mr, want a visual basic code on Hungarian method

want a visual basic code on Hungarian method

Hotel management system, i need to do my final project for my last year bsc...

i need to do my final project for my last year bsc honours degree in Business Information systems. I need to develop a system which is operational for hotel management system. th

Kitchen mock, How to pull ordered menu from a cash till to database or disp...

How to pull ordered menu from a cash till to database or display on a computer screen

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