DLL File – Definition & Explanation

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DLL (Dynamic Linked Library) file is an executable file. The file will give allow the sharing of code and resources to perform various tasks in the program. The Microsoft operating supports different kinds of dll files. These files contain functions so that windows based programs will work correctly. The greatest advantage with dll files is that they will be loaded into the memory when the requirement for them will arise. Thus, the storage system will be used very efficiently by using dll file implementation.

DLL File

File extension

Most of the dll files come with the .dll extension. However, these files will also have the .exe extension. In the windows based operating system, dll files will provide code and routines to running programs. If there is a driver to be installed in Windows, it will be in the form of dll file. There will be instructions in the dll file so that a program can be opened, closed and disabled as per your needs. The program can enable and can be used to raise a query as well.

Dll files are stored in the system directory of the Windows operating system. If you are running a program which depends on a dll file for its functioning, an error message, ‘cannot find .dll’ will be displayed. On the other hand, if you run a program based on an outdated dll file, you will get an error message, ’call to undefined dynalink’ will appear. In this context, appropriate dll file should be fetched, and it should be stored in the appropriate directory so that the program will function normally.

Benefits of dll

The dll file contains code which can be used in more than one program at the same time. The common dialog box functions in Windows OS are stored in a comdlg32.dll file. As the required code will be present in the file, each program which requires standard dialog box related functions can access the file, and it will perform its operations without any issues. Thus, code reuse is permitted, and memory resource can be used in a very efficient manner.

The code can be classified into various modules when you create dll files. The module will be loaded into the memory during the runtime. As separate modules are implemented, the load time of the module will also be very fast. The module is loaded when there is a request for the functionality.

Dll files can be updated very quickly. Other parts of the programs will not be affected when you update dll files. There will not be any requirement to install the program afresh when you depend on upon dll files. There are some files which will be implemented as dll files in Windows operating systems. These files include ActiveX controls (.ocx), control panel (.cpl), device driver (.drv) files.

When you use dll files, it is possible to follow modular architecture. The deployment and installation will be eased. If there are any issues with dll files, you can use dll troubleshooting files so that you can run various programs without any issues.

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