Difference between revisions of "Code samples"

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Below are a selection of VB code samples. Feel free to use any of them in your own projects.

Please also feel free to make your own contributions of articles and/or article modifications. The more articles we get the better this resource will be! :)

COM objects

• Firing events in an object from a code module
• Modularised Subclassing using interfaces and CopyMemory
• Modularised Subclassing (the same object twice) using interfaces and CopyMemory
• Creating singleton objects
• How to make your classes support For/Next constructs
• Streaming HTML into a webbrowser control from VB

File handling

• Creating shortcuts to files
• File I/O. Reliably
• Getting special folder paths
• How to iterate through a directory structure using APIs
• Working with INI files in .NET

Networking

• Sharing Folders and Files in Vb.NET
• How to get a list of the network adapters on the system
• Enumerating the IP addresses allocated to the local machine
• Buffering TCP data incoming from a socket
• Downloading files from websites using the WinInet API

Strings

• Creating unique IDs (GUIDs)
• How to randomise a list
• Including quote characters in a string
• Simplifying building of complex strings in code (eg sql statements)

User interface

• Creating and using control arrays
• How to catch mouse hover and out events
• How to catch KeyPresses on a form when a control has focus
• Edit Menus and the RichTextBox Control
• Common Dialog API Wrapper Class
• Dynamic control creation
• Streaming HTML into a webbrowser control from VB

Graphics

• Introduction to GDI drawing
• Drawing with a backbuffer
• How to draw an image to a DC with GDI
• All about StretchBlt
• Pattern Brushes
• BitBlt
• Creating Fonts
• Drawing sprites using any colour as transparent
• Saving JPEGs using GDI+ in Windows XP
• Get Default File Icon
• Persistent Graphics in VB.Net

Look & Feel

• Using XP style controls in your application
• Creating a transparent control in .NET
• Using Tab controls in your applications

Text boxes

• Allowing numeric values only
• Scrolling chat windows

List boxes

• Find items in a ListBox speedily

Windows

• Making a window "Always on top"
• Dragging windows/controls the easy way
• How to create a tool window that floats above your app
• How to subclass a window to catch useful windows messages in VB6 and in VB.NET
• Modularised Subclassing using interfaces and CopyMemory
• Modularised Subclassing (the same object twice) using interfaces and CopyMemory
• Regions and windows

Variables

• Hashtables in VB6
• How do you tell if a number is an integer?
• Obtain the type name for a variable
• Pass a user defined type to a class
• Pointers and CopyMemory
• Sorting
• Storing collections in property bags

Miscellaneous

• MD5 Hashing Using the Windows Cryptography API
• Adding icons to Explorer's System tray
• Open a URL in a web browser
• Sleeping without locking up the program (uses DoEvents)
• Why DoEvents can cause problems
• Detecting the version of Windows
• How to close your app without using End
• How to translate an API error to its textual equivalent
• Standards of nomenclature and semantics
• Converting seconds to Hours:Minutes:Seconds