what is the handle

Handle "Handle" is a concept in the operating system, used to represent a reference to a resource or object provided by the operating system. In computer programming, a handle is usually a pointer to a data structure or object in memory. Pointers, which allow programs to access, operate, and control operating system resources or objects. The use of handles can improve the efficiency and security of programs, and can also be used to implement inter-process communication and synchronization.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Handle (Handle) is a concept in the operating system, used to represent references to resources or objects provided by the operating system. In computer programming, a handle is usually a pointer to a data structure or object in memory that allows a program to access, manipulate, and control operating system resources or objects.

Handles can be used to access various resources or objects, such as:

• Window handle: used to identify windows in the operating system, and programs can use it to access and control the window.
• File handle: used to identify an open file, which can be used by programs to read and write file contents.
• Socket handle: used to identify the network socket, which the program can use for network communication.
• Image handle: used to identify image resources in the operating system, and the program can use it to perform drawing operations.

Handles are usually opaque, that is, the program cannot access the data structure or object actually represented by the handle, and can only operate on it using the handle operation functions provided by the operating system.

The use of handles can improve the efficiency and security of the program, because it can prevent the program from directly accessing operating system resources or objects, avoiding errors or exceptions. In addition, in multi-tasking operating systems, handles can also be used to implement inter-process communication and synchronization.

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