windows mobile programming usinb basic4ppc

8/7/2019 Windows Mobile Programming usinb basic4ppc

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Windows Mobile Programming

L. Ramkumar (PhD)

Vision Technologies (HP Education)


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Windows Mobile is a mobile operating system

developed by Microsoft that was used in

smartphones and mobile devices, but is being

currently phased out to specialized markets.


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Basic4ppc

Basic4ppc is a programming language

designed for mobile applications

development.

With Basic4ppc you can develop programs

directly on the Pocket PC / Window Mobile or

on the desktop.


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Basic4ppc includes a full featured Visual

Designer.

Basic4ppc applications can be compiled tonative executable (EXE files) without any

additional runtimes.


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Basic4ppc supports: Windows CE 5.0,

Windows CE 6.0, Windows Mobile 2003,

Windows Mobile 5.0, Windows Mobile 6.0,

Windows Mobile 6.1 and Windows Mobile

6.5. Basic4ppc supports both touch screen

devices and non-touch screen devices (the

device IDE is only supported on touch screendevices).


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Basic4ppc v6.90 introduces the

following new features:

Local variables can be declared with a specifictype. Declaring numeric variables significantlyboosts the performance of numeric calculations.

Subs parameters types and subs return type canalso be declared.

New types: Number and Integer. Correspond to.Net Double and Int32.

Subs parameters can be passed by reference(ByRef). This can be used to return several valuesfrom a sub.


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Improved syntax for working with dynamic objects anddynamic controls. Instead of writing Control(ControlName,ControlType), it is now possible to writeControlType(ControlName). The desktop IDE fully supports

the new syntax with autocomplete and with the usualpopup menu.

Desktop forms size and layout is more accurate now.

Scroll bar indicators. The desktop IDE now shows usefulindicators above the vertical scroll bar that helps with the

code navigation. FileFlush keyword. Writes any cached data to the file.

SQL library was updated to SQLite 3.6.16.

More clear error messages for many common mistakes.


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Modules

Basic4ppc projects are made of one main file,

with the extension "sbp" and any number of

modules files, with the extension "bas".

The main file holds the main module.

A module can include code, forms and

controls and objects.


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Subs

All program code (including global variables

definitions) is written inside Subs.

Subs declaration starts with [Public|Private]Sub SubName (Parameters) [As ReturnType]

and ends with End Sub.


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Variables

Variables can be either global or sub local.

Local variables value can be used only while

their parent sub is executing. Global variables values can be used

everywhere.

Global variables are variables that weredeclared (or used) in Sub Globals; all other

variables are local.


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Sub Globals

a=20

End Sub

Sub App_Start

b=10

CalcVars

End Sub

Sub CalcVars

Msgbox ("a = " & a)

Msgbox ("b = " & b)

End Sub

Result:

First msgbox will showa = 20

Second msgbox willshow b =

b is empty because it'slocal and wasn't

assigned any value yetin this sub.


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Array

Sub Globals

Dim Books (20)

Dim Buffer (100) As Byte

End Sub


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Structure Variables

Structures are variables with customized

fields.

Using structures the code can be clearer andbetter organized.

Structures must be declared in Sub Globals


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Sub Globals

Dim Type(Name, ID, Age) person

End Sub

Sub App_Start

person.Name = "John"

person.ID = 1234567person.Age = 30

End Sub


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Controls

Controls in Basic4ppc are global objects, which

means that each control has a unique name


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Operators

Basic4ppc supports the following operators:

+,-,*,/ Basic math operators

^ Power sign

mod Modulus operator

& String concatenation

' Remarks (REM is not supported)

The underscore character ( _ ) is used as a line continuationcharacter.

Long lines could be broken to shorter lines by putting anunderscore at the end of each line (except of the last one).


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Conditions

The simple conditions can be combined into a

more complex condition using the logical

operators and using parenthesis.

Conditions are "short-circuit" conditions.

Which means that the expressions will only be

evaluated if they can affect the result.

For example: IfStrLength(TextBox1.Text) > 4 AND

StrAt(TextBox1.Text,4) = "a" Then msgbox(true).


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Data Types

Name Description Range

Byte 8-bit unsigned integer 0 - 255

Int16 16-bit signed integer -32768 - 32767Int32 32-bit signed integer -2,147,483,648 -

2,147,483,647Int64 64-bit signer integer -9e18 - 9e18

Single 32-bit floating point -3.4e38 - 3.4e38

Double 64-bit floating point -1.79e308 - 1.79e308

Boolean 8-bit boolean value True, FalseDecimal 96-bit integer value -79e27 - 79e27

Char A Unicode character

String


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External Libraries and Objects

As of version 4.00 Basic4ppc supports working

with external libraries.

The external libraries are dll files whichinclude all kinds of new

functionality.


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Code Files

Basic4ppc supports separating the code into

several files.

A project must include one main sbp file. Theother files are regular text files.

Breaking the code into several files can be

handy when building large applications, or

when there is a need to write different code

for the desktop and the device.


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Menu Editor

The menu editor allows you to add menu

items to a form.

Reaching the menu editor is done through theVisual Designer - Controls - Menu Editor.


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Visual Designer

The Visual Designerallows you to buildyour GUI with littleeffort.

To open theDesigner, chooseMenu - Design -Create New Form

(or one of thealready createdforms, if any).


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Compiling

Compiled files can target Windows EXE

(desktop), Device EXE (Pocket PC / Windows

Mobile) and Smartphone EXE (Windows

Mobile Smartphones).


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Smartphone Applications

The difference between a Smartphone device and a regular mobiledevice is that Smartphones do not have a touch screen.

Some controls are not useful without a touch screen and thereforeare not supported (OS limitation).

The following controls are not supported:

Button

Calendar

ImageButton

ListBox

NumUpDown

RadioBtn

SaveDialog


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Screen Size and Resolution

As different devices have different screen sizes

and different resolutions, creating an

application that runs fine on all devices is not

a simple task.

The most common screen sizes are:

QVGA - 240 * 320, dpi: 96 * 96

VGA - 480 * 640, dpi: 192 * 192


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Unicode

Basic4ppc supports Unicode formatted as

UTF-8.

When working with a non-AS

CII file make sureto save it as UTF-8.


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Database

Database applications use the Table control.

The Table control stores data in rows (records).

If you do not want to show the table directly,then change its Visible property to false and use

the table only to access the data.

Each row consists of several columns.

Rows are accessed by their index (starting from 0)

and columns are accessed by there names.


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Demo

Trail Version Available @ www. Basic4ppc.com

MyMobiler to show the mobile display in PC

ActiveSync to transfer files between your pcand windows mobile.


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Questions ?


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Thanks.

windows mobile programming usinb basic4ppc

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