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1. How is DLL file generated

Many applications are divided into relatively independent dynamic link libraries and placed in the system to generate DLL files.

2. What is a DLL file

DLL (Dynamic Link Library) file is a dynamic link library file, also known as "application expansion", and is a software file type. In Windows, many applications are not a complete executable file, they are divided into relatively independent dynamic link libraries, namely DLL files, and placed in the system. When we execute a program, the corresponding DLL file will be called. An application can use multiple DLL files, and a DLL file may also be used by different applications. Such a DLL file is called a shared DLL file.

3. What is the use of DLL files?

The DLL file stores the functions (subprocesses) implementation process of various programs. When the program needs to call a function, it is necessary to load the DLL first, then obtain the function address, and finally make a call. The advantage of using DLL files is that the program does not need to load all code at the beginning of running, and it will only be removed from the DLL when the program needs a certain function. In addition, using DLL files can also reduce the volume of the program.

In Windows operating systems, each program can use the features contained in the DLL to implement the Open dialog box. This helps facilitate code reuse and memory efficient use.
By using DLLs, programs can be modularized and composed of relatively independent components. For example, a accounting program can be sold by modules. Each module can be loaded into the main program at runtime (if the corresponding module is installed). Because modules are independent of each other, the program loads faster, and the modules are loaded only when the corresponding function is requested.
Furthermore, it is easier to apply updates to individual modules without affecting other parts of the program. For example, you might have a salary calculation program, and the tax rate changes every year. After these changes are quarantined into the DLL, you can apply updates without rebuilding or installing the entire program.