Handles.md

• Handles
  • Explanation
  • Types of Handles
  • Usage

Handles

Explanation

1. Handles are an abstract reference or identifier for a resource (e.g., file, memory, window) that is managed by the operating system or runtime system.
2. They allow interaction with resources without exposing low-level details, ensuring safe and controlled access.
3. They provides abstraction, resource management, and cross-platform compatibility.

Types of Handles

1. File handle:
   • A reference used to interact with a file (e.g., open, read, write).
2. Window handle (HWND):
   • A unique identifier for a window or UI component in GUI programming.
3. Memory handle:
   • A reference to a block of memory, typically used for managing resources like shared memory.
4. Object handle:
   • A pointer or reference to an object, often used in object-oriented programming to manage object instances.
5. Database handle:
   • A reference to a database connection used to execute SQL queries and retrieve results.

Usage

1. File I/O operations:
   • Interacting with files via file handles.
2. GUI programming:
   • Managing windows or UI elements through window handles.
3. Memory management:
   • Interacting with allocated memory via memory handles.
4. Database operations:
   • Executing queries and transactions using a database handle.