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www.arcanatech.com
Web Application Development
in IntraWeb
Session #2006
Presented by
Jason Southwell
Arcana Technologies
www.arcanatech.com
Who am I?
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Delphi Developer since 1995
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President of Arcana
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Consultant
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Freelance Author
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Member of
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A-Team, TeamZed
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Indy Core
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FreeCLX, CrossFPC
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Who are You???
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IntraWeb
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Radically simple web development
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Application Based Framework
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Process Identical to VCL Development
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Cross-platform / Cross-environment
Included in Delphi 7 (IW 5.1) and Delphi
2005 (IW 7.2)
No need for HTML / JS / CSS
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But the knowledge will help you...
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Component Usage
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All non-visual thread-safe components
IntraWeb forms are a special type of
form and require custom IW specific
visual components
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Most standard VCL visual components have IW
replacements
Powerful 3rd Party IW Components
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TMS - www.tmssoftware.com
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Arcana - www.arcanatech.com
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Structure of a Project
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DPR
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ServerController
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Global server settings
UserSession
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Varies depending on whether you are building
a Service, Standalone, ISAPI or DSO
Session based data module
Unit1
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Your first visual IW form
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Deployment
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ISAPI
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Standalone
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Custom Indy based web server
Service
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IIS, Omni, Apache, others
Custom Indy based web server
DSO
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Apache (not supported in D2005/2006)
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Deployment Requirements
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Standalone / Service
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ISAPI
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Upload exe and execute (or install service).
Upload to scripts folder on web server or
configure script application on IIS
DSO
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Upload to web server & edit Apache config file
May require additional files:
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Images
Flash Animation, Movies
StyleSheets/Script
The “Files” & “Cache” subdirectories
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Layout Options
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Delphi Form Designer
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Most like VCL development
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Anchors & Alignment
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Compatible with Delphi Frames
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Form Inheritance
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Regions (panels)
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Visual changes require recompile
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Layout Options
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Runtime HTML Templates
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Requires HTML/JS/CSS knowledge
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Design HTML files and “embed” IW controls
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HTML files with {% %} tags
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Visual changes do not require recompile
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Hand off visual design to web designers.
Design-time HTML Designer
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Design-time Template editor
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Embeds Templates in dfm file
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Visual changes require recompile
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Database Connectivity
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Nearly any Database components
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ADO
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dbExpress
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IBX / IBO / FreeIB
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Zeos
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DBISAM / NexusDB
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BDE (but not recommended)
UserSession based DataModule
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Design Considerations
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No Global Variables
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Thread-safety
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Report Delivery
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Resource Management
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Custom Components
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Missing Events
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Maximizing Scalability
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Reduce Page Response Time
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Decrease Memory Footprint
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Release forms when not in use
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Don't overuse UserSession for storage
Improve Code Efficiency
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http://arcanatech.com/optimalcode.html
Use a replacement Memory Manager
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NexusDB Memory Manager 3
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FastMM4 (free)
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Maximizing Scalability
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Beware Synchronization Objects
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Reduce Bandwidth Requirements
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Increase Server Specs
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Partial Updates
Memory/CPU/Bandwidth
Add Additional Server Machines
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Software Switch – Octagate
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Hardware Switch – Layer 5-7
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DNS Round Robin
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Database Pooling
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Built-in pooling support
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DataModule Based Pool
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Positives
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Improves Responsiveness
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Reduces Memory Usage
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Improves Scalability
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Simplifies DB access from Threads &
ServerController
Negatives
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Makes Working with data-aware components
more difficult, though not impossible.
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Reducing Session Count
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Termination
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User must initiate termination
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Or wait for session timeout
Re-entry
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Limits duplicate sessions
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Returns user to last viewed form & state
Single Instance Sessions
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Limits duplicate sessions
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Limits user's multi-tasking capabilities
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Page Based Modes
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Page Mode
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Based on WebBroker
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Can Integrate WebSnap / WebServices
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No Session/State Management
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Series of “disconnected” pages
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Like a compiled ASP, PHP or ASP.NET
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PageMode included with D7 / D2005 Pro
IWP Mode
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Page Mode with static page delivery.
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Static Page
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Render Modes
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3.2 Mode
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Works in all HTML browsers
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Does not require Javascript
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Requires use of Templates
WAP Mode
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Renders to WML
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Works in cellphone browsers
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Can use WML Templates, but not required
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JavaScript Integration
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Javascript Resources
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www.dynamicdrive.com
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www.javascriptcity.com
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www.codelifter.com
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IWTop()
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FindElem()
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SubmitClick(), SubmitClickConfirm()
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User Authentication
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HTTP Authentication
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Web Standard
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Plain Text Passwords
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Simple to Implement
Custom Login Forms
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More Flexible
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Plain Text Passwords
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Have Secured and Unsecured Pages
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Variable Session Timeouts
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Secure Applications
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HTTPS
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Authenticates Server
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Encrypts Web Traffic
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Cert.pem & Key.pem
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Indy Specific OpenSSL Libraries
SSL Certificates
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Verisign / GEOTrust / RapidSSL
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Self-signed Certs
SSL Buddy
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Custom Components
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Base Objects
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TComponent – Non-visual
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TIWControl – Visual
Interfaces
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IIWBaseComponent, IIWBaseControl,
IIWBaseContainer
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IIWInputControl, IIWSubmitControl
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IIWTabOrder
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IIWSubmitInvisible
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IIWUpdateNotified
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Custom Components
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Important Method Overrides
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InitControl()
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SupportsInput()
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RenderHTML()
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Submit()
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SetValue()
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IWPaint()
Important Helper Objects
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RenderContext, PageContext
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TIWHTMLTag
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Custom Components
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Default Paint Handlers
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File Upload, RadioButton, RadioGroup
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Rectangle, Label, Button, Edit
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Checkbox, ComboBox, ListBox
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Memo, Link, Text, Image, HRule
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List, DBNavigator, ProgressBar, Region
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TabControl, TabPage
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Any Questions?