Code samples

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

Variables

• 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

COM objects

• Firing events in an object from a code module
• Modularised Subclassing using interfaces and CopyMemory
• Creating singleton objects

User interface

• How to Catch Mouse Hover and Out Events
• How to catch KeyPresses on a form when a control has focus

GDI

• Introduction to GDI drawing
• How to draw an image to a DC with GDI

Text boxes

• Allowing numeric values only
• Scrolling chat windows

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
• Modularised Subclassing using interfaces and CopyMemory

File handling

• File I/O. Reliably
• Getting special folder paths
• How to iterate through a directory structure using APIs

Networking

• How to get a list of the network adapters on the system

Miscellaneous

• Open a URL in a web browser
• Sleeping without freezing the program (uses DoEvents)
• Why DoEvents Are Evil
• Detecting the version of Windows
• How to close your app without using End