VB chap 05

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KHEC II/II Visual Programming (BEG275CO) - 1 -

CHAPTER FIVE

5.0 ADVANCED INTERFACE DESIGNING CONTROLS:

5.1 COMMON DIALOG CONTROL:

The common dialog control provides the standard set of dialog boxes such as opening and saving files, setting

print options and selecting controls and fonts. Common dialog control can be used in the application by adding itfrom components of project menu and selecting common dialog control 6.0 and setting its properties. Then a newobject is seen in the toolbox and this is added to the form for further processing. The dialog displayed by the

control is determined by the methods of control. At run time the dialog box is displayed when the appropriate

method is invoked. At design time the common dialog control is displayed as an icon in the form. It provides its

services to the application but it doesn't need to be displayed on the form at runtime. The common dialog controallows displaying the following commonly used dialog boxes open, save as, color, font, print.

Method Value Dialog displayed

Showopen 1 Open

Showsave 2 Save as

Showcolor 3 Color

Showfont 4 FontShowprinter 5 Print

Showhelp 6 Invokes windows help

5.1.1 FILE OPEN DIALOG:

The open dialog box allows the user to specify a drives directory, a filename and a filename extension. At runtime when the user chooses a file and closes the dialog box the filename property is used to get the selected

filename. To display the open dialog box

Private sub cmdopen_click()

Commondialog1.showopen

Commondialog1.filter="all files (*.*) | *.*| text files (*.txt)|*.txt| batch files (*.bat)"Commondialog1.filterindex = 0End sub

Compiled By: Er. SRB

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5.1.2 FILE SAVE AS DIALOG:

This dialog displays a window for saving the file in appropriate directory of a certain drive.e.g.:

commondialog1.filter="text files|*.txt| batch files |*.bat| INI files|*.INI"

commondialog1.filterindex=1commondialog1.action=2 (or commondialog1.showsave)

End sub

5.1.3 COLOR DIALOG:This dialog allows the user to select a color from a palate or to create and select a custom color.To display color dialog box:

Private sub commnad1_click()Commondialog1.showcolor

Form1.backcolor=commondialog1.color

End sub

Font Dialog Box:

This allows user to select a font by its size, color and style. Once user makes a selection in the font dialog box, the

following properties contain the information about the user's selection.

Property DeterminesColor Determines the selected color. To use this property you must first set the flag property

(CdlCFEffects)

FontBold Whether Bold was selected.

FontItallic Whether italic was selected.

FontStrikethru It's true if the strikethrough attribute is set.

FontUnderline For underlined text

FontName The selected font name

FontSize Returns the selected font's size

E.g.:

Private sub command1_click()

Commondialog1.flags=CdlCFBoth {sets the flag property. It can be either.CdlCFScreen Fonts (for Screen font)

.CdlCFPrinter Fonts (for Printer font)

.CdlCFBoth (for Both)}

Commondialog1.showfont (display the font dialog box)

Text1.font.name=commondialog1.fontname (sets text properties according to the users selection)Text1.font.sizename=commondialog1.fontsize

Text1.font.bold=commondialog1.fontbold

Text1.font.itallic=commondialog1.fontitallic

Text1.font.underline=commondialog1.fontunderlineText1.Font.Strikethrou = CommonDialog1.FontStrikethru

Text1.font.color=commondialog1.colorEnd sub

Printer Dialog Box:

This dialog allows user to specify how O/P should be printed. The user can specify a range of pages to be printed,a print quality, a no. of copies and so on. This dialog displays information about the currently installed printer.

This dialog box only allows user to specify the way of data printing but never print the data. Necessary code is

required for printing them.

e.g.:


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private sub command1_click()

dim startpage, endpage, numberofcopies' displays the print dialog box

Commondialog1.showprinter

'get user selected values from the dialog boxStartpage=commondialog1.frompage

Endpage=commondialog1.topage

Numberofcopies=commondialog1.copiesEnd sub

5.1.4 Help Dialog:

This dialog displays the help dialog box and allows to display the help file.e.g.:


Commondialog1.showhelpCommondialog1.helpfile="path"

End sub

5.2 WORKING WITH CONTROL ARRAYS:

A control array is an array of controls i.e. a control array is a group of controls that share the same name and type.They also share the same event procedure. A control array has at least one element and can grow to as man

elements as the system supports. The maximum index that can be used in the control array is 32767. Elements of

the same control array have their own property settings and control arrays are used in menu control and option buton groupings.

The advantages of using control with control arrays is that they need less resources than simply adding multiple

controls of the same type to a form at design time. They are also useful if you want several controls to share code.At runtime, if the user creates a control, then that control must be member of a control array. With a control array,

each new element inherits the common event procedure of the array.

CREATING A CONTROL ARRAY:

There are three ways of creating a control array at design time.i) By assigning the same name to more than one control.

ii) By copying an existing control and then pasting it onto the form.iii) By setting the index property to a value that is not null.

Adding and Removing a Control Array at Runtime:

User can add and remove controls in a control array run time using the load and unload statements. However, thecontrol to be added must be an element of an existing control array. User must have created a control at design

time with the index property set, preferably to 0. Then, at run time, user can use this syntax.

Argument Description

Object Name of the control to add or to delete from the control array

Index % The control's index value in the array

Draw the following design

Private sub text1_gotfocus(index as integer)Text1(0).text="Ram"

Text1(1).text="VB"


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Text1(2).text="9841454545"

End sub

5.3 CREATING MENUS FOR PROGRAM:

VB provides a feature that increases the functionality of an application by adding the menu bar i.e. VB application

can be enhanced by adding menus to it. It offers convenient and consistent way to group commands easy way forusers to access them. The menu bar appears below the title bar and it may contain one or many menus (titles).

When a menu title is clicked, it displays the set of menu items under that title and its drop down. Each menu item

corresponds to a menu control that is defined in a menu editor and performs a specific action.Once these menus are created they can be individually programmed to respond when selected. For designing themenu select from tool menu, the menu editor and design accordingly in the appeared window by giving

appropriate name and caption with required access key or shortcut key.

Menu Properties:

Menus are controls whose appearance and behavior can be changed and manipulated through its properties. These

properties are displayed constantly in the menu editor window itself and can be set at design time using the menueditor dialog box or at run time from within code.

Property

Name

Description

Caption The text of the menu that the user will see.

Name The name that is used to code to refer to the menu item and to identify the event code for eachmenu item.

Index Used to form menu control arrays. This is where more than one menu item has the same name

property and a number in the indexed property is used to address each item.

Shortcut The menu can be invoked either by clicking it with the mouse in a normal way or by pressing

the shortcut key. For e.g. Ctrl+X for cut operation.

Windowlist This is used in multiple document interface (MDI) applications. This property tells VB to

display the captions of the child window in the menu item.

Checked Setting it to true causes a tick or check mark to appear beside the menu item. This is best for lists

of options.

Enabled Setting it to true allows user to select the menu item. Setting it to false causes the menu item to

appear the gray out i.e. user can't select it.

Visible Setting it to true causes the menu item to be visible at run time, clearing the check box makes i

visible

Negotiate Controls where, if at all, the menu appears when dealing with embedded ActiveX objects


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Position

Menu Separator:

A separation bar is a line that is used to break the item into a logical sequence which is useful for obtaining clarity.Separators are just as easy to create as any other menu items. Simply enter the menu item's caption as the

character dash (-) and a dummy name such as mnudash1 as the name property. VB automatically interprets a

menu item with a dash line as a separator line i.e. caption as '-' and name as mnudash1.

5.3.2 ADDING SHORTCUT AND ACCESS KEYS TO MENU ITEMS:Keyboard access to menu can be improved to menu controls by defining access keys and shortcut keys.

ACCESS KEYS:

Access keys allow the user to open a menu pressing the Alt key and typing designated letter. Once a menu is

opened, the user can choose a control by pressing the letter assigned to it. For e.g. Alt +F for file menu. Access

key assignments appear as an underlined letter in the menu controls caption.To assign an access key to a menu control in the menu editor.

i) Select the menu item to which you want to assign an access key.

ii) In the caption box type an ampersand (&) immediately in front of the letter that you want as the accesskey.

SHORT CUT KEYS:

Shortcut key run a menu item immediately when pressed. Frequently used menu items may be assigned akeyboard shortcut which provides a single set method of keyboard access, rather than a three step method of

pressing Alt, menu title access character and the menu item access character. Shortcut key assignments include

function key and control key combinations such as Ctrl+F, Ctrl+A, Ctrl+C etc. They appear on the menu to the

right of the corresponding menu item.To assign a shortcut key to a menu item

i) Open a menu editor.

ii) Select the menu itemiii) Select the function key or key combination in the shortcut combo box.

5.3.3 CREATING AND ACCESSING POP UP MENUS:

A pop up menu is a floating menu that is displayed over a form independent of the menu bar. The class displayed

in the pop up menu depends on where the pointer was located when the right mouse button was pressed. So, pop

up menu are also called context menus. Pop up menus are used to provide an efficient method for accessingcommon contextual commands.


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To create a pop up menu, the same steps for creating the main menu in menu editor is followed with one extra step

i.e. the pop-up menu should be hidden, so that it does not appear on the menu Bar. To hide the menu, set thevisible property of the top-level menu item to false. Any menu that has at least one menu item can be displayed at

runtime as a pop up menu. To display a pop up menu the PopUpMenu method is used. This method uses the

following way of declaration.

Object.PopupMenu menuname [flags, x, y, boldcommand]

E.g.:Private sub form_mouseup(Button as integer, shift as integer, x as single, y as single)If button=2 then

Popupmenu mnufile

End ifEnd sub

i) Flag Arguments:

These are used to further defining the location and behavior of a pop up menu.

Location Constants Description

VbPopupMenuLeftAlign Default. The specified X location defines the left edge of the pop-up menu.

VbPopupMenuCenterAlign Pop-up menus is centered around the specified X location.VbPopupMenuRightAlign Specified X location defines the right of the pop-up menu.

Behaviour Constant Description

VbPopupMenuLeftButton Default. The pop-menu recognizes when the user clicks a menu item with the lef

mouse button only.

VbPopupMenuRightButton The pop-menu recognizes when the user clicks the menu item with either the righ

or left mouse button.

e.g.:


Dim xloc, yloc

Xloc=scalewidth/2Yloc=scalewidth/2

Popupmenu mnuedit,VBPopUpMenuCenterAlign(or Popupmenu mnuedit, VBPopUpMenuRightButton, xloc, yloc)

End sub

ii) X & Y Arguments:

Used to specify the X-Y coordinates where the pop-menu will be displayed.

iii) Bold Command Arguments:

Used to specify the name of a menu control which must appear in bold in the pop-up menu. Only one menu

control in the pop-up menu can be bold.

5.3.4 MODIFYING MENUS AT RUN TIME:

At design time menus you have created are displayed on the form when you close the menu editor. Choosing a

menu item on the form displays the click event procedure for that menu control where the required coding iswritten. The menus created at design time can also respond dynamically, to runtime conditions. For e.g. if a menu

item action becomes inappropriate at some point, then the programmer can prevent users from selecting that menu

item by disabling it. Programmer can also design the application to use a checkmarks to indicate which of theseveral commands was last selected. For e.g. the font's menu item from the application displays a submenu with a

check mark next to the last font size selected. Compiled By: Er. SRB

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Enabling & Disabling Menu Commands:

E.g.

mnufl(3).enabled=true/false (control array)

mnufl.enabled=true/false

Displaying a checkmark on a menu control:

Using check property you can place a check mark on your menu.i) Tells the user the status of an on/off condition. Choosing the menu command alternatively adds and

removes the check mark.

ii) Indicate which of several modes is in effect. The settings menu of the text editor uses a check mark to

indicate the current front size.

Making a menu control invisible:

E.g.:

Mnflarray(0).visible=true/false

Adding Menu Control at Runtime:

A menu can grow at runtime. Control array is used to create a menu at runtime. For e.g. if have created a menu as

mnflarray then this menu control is assigned a value for the index property at design time; it automaticallybecomes an element of control array even though no other elements have yet been created. When you create amnflarray(0), you actually create separator bar that is invisible at runtime. The first time a user opens a file at run

time, the separator bar becomes visible, and the first file name is added to the menu. And each time you open a

file at runtime, addition menu controls are loaded into the array, making the menu grow.

5.4 WORKING WITH ACTIVEX CONTROLS (MICROSOFT WINDOWS COMMON CONTROLS):5.4.1 TREE VIEW CONTROL:

A tree view control is used to display information within a tree hierarchy. A tree view is made up of nodes that arerelated to each other in some ways. Typically tree view control is used to display the headings in documents

entries in an index, the files and directories in a disk etc. The tree view is added to the toolbox from selecting

project menu and then from components selects the Microsoft windows common control 6.0 then it is placed onthe form for further operation.

A tree view control displays a hierarchical list of node objects, each of which consists of a label and an optional

bitmap. After creating a tree view control, one can add, remove, arrange and otherwise manipulate node objects by

setting properties and invoking methods. Nodes can be expanded or collapsed to display or hide all child nodesaccording to the requirement. Three events, the collapse, expand and node click event also provide programming

functionality.

ADDING NEW ITEMS:

The items or nodes on a tree view control are members of the nodes collection. The following is used to access the

nodes collection.

Treeview1.nodes

The following are the methods and properties of the nodes collection

Add Method: to add a new node to the nodes collectionCount Property: returns the member of nodes in the nodes collection

Clear Method: to remove all the nodes from the collection

Item Property: to retrieve a node specified by an index value or a key.Remove Method: to remove a node from the nodes collection.


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To add a new node with the add method then you must specify its position in the hierarchy, the node text, its key,

an image that will be displayed in front of the node and an image that will be displayed when the node is selected.The syntax for add method is

Node.add relative, relationship, key, text image, selected image

Here first argument is the key of the node, under which a new node is placed. The second argument indicates the

relationship between the node specified in first argument and new node, the fifth argument is the text of the node.

Private sub cmdadd_click()Treeview1.nodes.add, , "FRUIT", "fruits"

Treeview1.nodes.add, , "COLOR", "colors"

Treeview1.nodes.add, , "SAPE", "shapes"Treeview1.linesytle=TVWRootlinesEnd sub

Here the line style determines the appearance of the line that connects nodes in a tree. Line style can have two

values, 0 (tvwtreelines) and 1 (tvwrootlines). If line style is 0 then there will be line connecting parents to childrenand children to each other. If line style is 1 there will be lines connecting the root nodes.

Private sub cmdfrt_click()Treeview1.nodes.add "FRUIT", tvwchild, , "apple"

Treeview1.nodes.add "FRUIT", tvwchild, , "grapes"

Treeview1.nodes.add "FRUIT", tvwchild, , "pineapple"

End subPrivate sub cmdclr_click()

Treeview1.nodes.add "COLOR", tvwchild, , "red"

Treeview1.nodes.add "COLOR", tvwchild, , "green"Treeview1.nodes.add "COLOR", tvwchild, , "blue"

End sub

Adding a parent property:

As seen in the window explorer, the child nodes have tree lines in front of them, but their parents have the plus

sign which indicates that a node has a child and can be expanded.

E.g.: in above program

Private sub cmdadd_click()Treeview1.nodes.add, , "SAMPLE","sample"

(Displays all the nodes under a header called items)Treeview1.nodes.add " SAMPLE", tvwchild," FRUIT", "fruits"

Treeview1.nodes.add " SAMPLE", tvwchild," COLOR", "colors"

Treeview1.nodes.add " SAMPLE", tvwchild," SHAPE", "shapes"

Here the first argument is the key of the parent node and their second argument add the first level items.

Treeview1.nodes.item(" sample").expanded=true


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(for expanding the item node from code)5.4.2 TOOLBAR CONTROL:

Toolbars provide the users an easy way to access the most commonly used functions of the program. A toolbar

contains buttons that corresponds to items in an application menu providing a graphic interface for the user to

access an application most frequently used functions and commands. A toolbar control and an image list controlare used to add a toolbar to the form. The image list control contains a collection of bitmaps for use by other

controls and the toolbars control uses images from the image list control to display them on its button.

Toolbar control is added in the toolbox from project menu and then selecting components and then selectsMicrosoft window common control 6.0.

The toolbar enables programmer to create 6 different types buttons as

i) Push button: works like command button i.e. 0-tbrdefault e.g. save button in word.

ii) Check button: works in an on/off mode i.e. 1-tbrcheck e.g. bold in word.iii) Button group: work like option buttons i.e. 2-tbrbuttongroup e.g. alignment button in word.

iv) Separator: create empty spaces i.e. 3-tbrseparator

v) Place holder: create empty space allowing one to place other controls such as combo box i.e. 4-tbrplace holder e.g. font combo box in word.

vi) Drop down buttons: when clicked offer the user a drop down menu of choices i.e. 5-tbrdropdown e.g

add from location in VB.

For e.g.i) Add image list control on the form. Then to add bitmap image to the control press the ellipsis (

button of the custom property in the properties window.

ii) Then from image tab add images and then click on insert picture button and then click on ok button.iii) Draw the toolbar control on the menu and set the toolbar's alignment to none, top, bottom, left, or right

accordingly.

iv) Right click on the tool bar control and choose properties.v) Then create buttons on the toolbar from buttons tab and then click on insert button command button.

For each button specify the following properties as seen in above fig:

Caption: this text is displayed beneath the picture on a button.

Description: this text describes the button on the users when they invoke the customize toolbar dialogbox.


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Key: this property specifies a string that is used to identify the button in code.

Image: this property specifies the index of the picture that you want to appear on the face of thebutton. It corresponds to the index of the picture in the imagelist control specified in the general tab

Zero can be specified for the image property if you do not want a picture to appear on the button.

Style: this property determines the type of button that you create.

Tooltiptext: this text appears when the mouse pointer rests on the button. This text is displayed only if

shoe tips property is set to true.

Value: this property set or returns the current state of the button. A value of 0 indicates that the buttonis not pressed. A value of 1 indicates that the button is pressed.

vi) Then insert button command is clicked to add the buttons and then press ok.

For e.g.Place a toolbar and an image list on the form as shown below

Then in follow the above mentioned procedures.

To display the image on the button give the image no. the same value that is given while inserting the image onthe image list.

Then double click on the toolbar and code as.

Private Sub Toolbar1_ButtonClick(ByVal Button As MSComctlLib.Button)Text3.Text = Val(Text1.Text) + Val(Text2.Text)

End Sub

This will display the sum of entered two nos.5.4.3 STATUS BAR CONTROL:

A status bar is a control that is displayed at the bottom of an application window unless its alignment is mentionedand displays information about the current state of the application. The status bar control can display and update

certain types of information automatically. Set the style property to display the following

Keyboard status for the caps lock, num lock, insert and scroll lock keys.

Date

TimeThe status bar can also contain text and bitmaps so that the message can also be displayed from the application in

the status bar by using text property.

Draw the status bar on the form. The status bar spans

i) The widths of its parent form and contain a single panel.A status bar is broken into panel objects each of which displays different types of information. The

panel collection of the status bar contains all the panel objects. The appearance and purpose of

each panel is determined by the style property of that panel.


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ii) Then right click on status bar and select properties. Then adjust the style and simple text properties o

the status bar. These properties determine the appearance of the control at the runtime. The styleproperty can have one of the two values simple or normal.

Simple: when the style property is simple, only one panel of the status bar is visible, and the text is

displayed in the simple text property.

Normal: the toolbar appears with multiple panels.

Further control over the appearance of a status bar is done by setting properties from the panel tab for the propertypages like sbrtext(0), sbrcaps(1), sbrnum(2), sbrins(3), sbrscrl(4), sbrline(5), sbrdate(6) etc.

The syntax for adding panels in the status bar using the add method at the runtime is

Statusbar1.panels.add (index, key, text, style, picture)i.e.

private sub form_load()

statusbar1.panels.add 1 , , "sample text", sbrtextstatusbar1.panels.add , , , sbrnum

end sub

The syntax for removing a panel object isStautsbar1.panels.remove index

i.e.

private sub form _load()statusbar1.panels.add 1 , , "sample text", sbrtext

statusbar1.panels.add , , , sbrnum

statusbar1.panels.remove 1end sub5.4.5 IMAGE LIST CONTROL:

The image list control is basically list of images but instead of storing only a single picture, the image list stores acollection of pictures. The image list control does not contain anything visible at run time; it is merely a storage

area for the image.It is an ActiveX control that loads and stores group of images for use by other controls. The image list controlmaintains a series of images in its memory that other controls and quickly access at run time.

i) Add the image list control on the form.

ii) To add image to the control, press the ellipsis () button of the custom property in the properties

window.iii) Then from images tab of appeared window add images and then click on insert picture button and click

on ok.

At runtime, image list can be accessed asImagelist1.add, , loadpicture("path")

For e.g. place an imagelist and a timer on the form and code as

Private Sub Form_Load()Call Randomize

Timer1.Interval = 500

End Sub

Private Sub Timer1_Timer()

Dim r As Integerr = Int(6 * Rnd()) + 1

Form1.Refresh


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Call PaintPicture(ImageList1.ListImages(r).Picture, Rnd() * Width, Rnd() * Height)

End Sub

This will display the added images from the imagelist on the form randomly.5.4.4 PROGRESS BAR CONTROL:

This control shows the progress of a lengthy operation by filling a rectangle with chunks from left to right. This

control doesn't always indicate how many minutes or seconds it will take the computer to perform given task but it

provides the visual feedback necessary to convince the user that their transaction has not ground to halt or lockedup the computer. This control has a range and a current position. Range represents the entire duration of operation

and the current position represents the progress made towards completing the operations.

Design the following interface and code as:

Private sub cmdsm_click()

Dim I as integer

Progressbar1.min=0Progressbar1.max=10000

Progressbar1.visible=true

For i=0 to 10000Progressbar1.value=i

Next i

Progressbar1.visible=false

Progressbar1.min=0Txtres.text=val(txtnm1.text)+val(txtnm2.text)

End sub

Private sub form_load()Progressbar1.visible=false

End sub

5.5 INTERFACE5.5.1 SINGLE DOCUMENT INTERFACE (SDI):

The application that displays only one document at a time is called SDI. When an SDI application is executed, it

can only display one document at a time. To edit multiple documents simultaneously user must execute anotherinstance of document. Application containing only one form with various objects in VB is the example of single

document interface. A project in VB may contain no. of forms but these forms can be run one at a time while theothers can't be accessed at the same time, they remain unloaded.5.5.2 MULTIPLE DOCUMENT INTERFACE:

When an application is designed, it might contain a no. of forms and each of these forms are displayed separately

on the screen and moved, maximized or minimized separately from any other form. These forms can be organized

as a group using MDI. The MDI is another class of the form object that allows us to open windows with in aparent container window. E.g. Microsoft word or excel have multiple document interface. An MDI application

allows to display multiple documents at the same time with each document displayed in its own window.

Document windows are contained in a parent window in application. Any application can have only one MDI


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form which contains all the application's child forms. At runtime, child forms are displayed within the interval

area of the MDI form.

Design time features of MDI child forms:

At design time, child forms are not restricted to the area inside the parent form. You can add controls, set

properties, write codes and design the features of child forms anywhere on the desktop. One can determinewhether a form is a child by examining the project window. The project window uses special icons to distinguish

standard forms, MDI child forms and MDI parent forms.

Run time features of MDI child forms: At run time all child forms are displayed within the parent forms internal area. The user can move and size

child form only within the internal area of the parent form.

When a child is minimized, its icon appears on the MDI parent form instead of users desktop.

When the parent form is minimized the entire application is represented by a single icon when restored all

forms are re-displayed as they were.

When a child form is maximized its caption is combined with parents' forms caption and displayed in the

parent title bar.

By setting the 'autoshowchildren' property, one can display child forms automatically, when forms are loaded.

New child forms can be created at runtime using a special form of the dim statement.

The parent form 'activeform' property indicates which child form is currently active. The 'active controlproperty indicates which control on the active child form has focused.

MDI form has all the properties similar to general form. So one can add picture, buttons on the form for easier

accessing of the data in the application.

The arrange command can be used to determine how the child forms and their icons are displayed.

To create an MDI application, at least two forms are needed in the application. One is the parent or container form

and the second is the child or the form contained with the parent. To have more than one type of child form youcan add further forms to the project. Only a single child form is required for the simple MDI projects.

To create MDI form:

From project menu, choose add MDI form.

To create the application's child forms:From project menu, choose Add from to create a new form or open an existing form and set its MDIchild property

to true.e.g.:

i) Open VB in standard exe and change the caption of form to child form.

ii) By right clicking on the forms folder in the project explorer add the MDI form by selecting Add MDI formdialog.

iii) Change the caption of MDI to MDI parent.

iv) Right click on project1 in the project explorer and select project1 properties from the pop up menu. Setthe startup object list to MDI form.

v) Select the child form from project explorer and set the form's MDI child property to true in the project

window. This will cause this form which is the child, to rest inside the MDI parent container.vi) Run and see the O/p.

For example we have two child forms, out of which one is used to calculate the sum of entered two numbers and

another form displays the upper case of entered lower case letters. These forms can be displayed in MDI form by

following the above mentioned process. Beside this, menu can also be added on the MDI form as shown below.This program firstly displays two child forms on MDI form and selecting each from menu shows only the selected

form on the MDI form.


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Code for child1 form

Private Sub Cmdsm_Click()

Text3.Text = Val(Text1.Text) + Val(Text2.Text)

End SubPrivate Sub Cmdexit_Click()

Unload Me

End Sub

Code for child2 form

Private Sub Cmdconvr_Click()

Text2.Text = UCase(Text1.Text)End Sub

Private Sub Cmdexit_Click()

Unload MeEnd Sub

Code for MDI form

Private Sub MDIForm_Load()child1.Show

child2.Show

End Sub

Private Sub slch1_Click()

child1.Showchild2.Visible = False

End Sub

Private Sub slch2_Click()

child2.Showchild1.Visible = False

End Sub


VB chap 05

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Transcript of VB chap 05