dynaminc linked libaries

Hi,

Dynamic-link library (also written unhyphenated), or DLL, is Microsoft's implementation of the shared library concept in the Microsoft Windows and OS/2 operating systems. These libraries usually have the file extension DLL, OCX (for libraries containing ActiveX controls), or DRV (for legacy system drivers).

Advantages of DLL

Given below are a few advantages of having DLL files.

Uses fewer resources

DLL files don't get loaded into the RAM together with the main program; they don't occupy space unless required. When a DLL file is needed, it is loaded and run. For example, as long as a user of Microsoft Word is editing a document, the printer DLL file is not required in RAM. If the user decides to print the document, then the Word application causes the printer DLL file to be loaded and run.

Promotes modular architecture

A DLL helps promote developing modular programs. It helps you develop large programs that require multiple language versions or a program that requires modular architecture. An example of a modular program is an accounting program having many modules that can be dynamically loaded at run-time.

Aid easy deployment and installation

When a function within a DLL needs an update or a fix, the deployment and installation of the DLL does not require the program to be relinked with the DLL. Additionally, if multiple programs use the same DLL, then all of them get benefited from the update or the fix. This issue may occur more frequently when you use a third-party DLL that is regularly updated or fixed.

Applications and DLLs can link to other DLLs automatically, if the DLL linkage is specified in the IMPORTS section of the module definition file as a part of the compile. Else, you can explicitly load them using the Windows LoadLibrary function.

For more details please check these links :

http://www.tutorialspoint.com/dll/

https://en.wikipedia.org/wiki/Dynamic-link_library

https://msdn.microsoft.com/en-us/library/windows/desktop/ms682589(v=vs.85).aspx

https://support.microsoft.com/en-in/kb/815065

Hope this will help you to understand Dll.

Here is the definition of it form google:

"A dynamic link library (DLL) is a collection of small programs, any of which can be called when needed by a larger program that is running in the computer. The small program that lets the larger program communicate with a specific device such as a printer or scanner is often packaged as a DLL program (usually referred to as a DLL file). "

When you write some code, that needs to be shipped to server in case of web application and on client machine in case of desktop application, the source code we write gets compiled in case of .Net, code is converted in to another language which is called MSIL intermediate language which is stored in the DLL.

I hope it helps.

5 Replies

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Subash10y ago
thanks manoj
0
Manoj Bhoir10y ago
Hi,
Dynamic-link library (also written unhyphenated), or DLL, is Microsoft's implementation of the shared library concept in the Microsoft Windows and OS/2 operating systems. These libraries usually have the file extension DLL, OCX (for libraries containing ActiveX controls), or DRV (for legacy system drivers).
Advantages of DLL

Given below are a few advantages of having DLL files.

Uses fewer resources

DLL files don't get loaded into the RAM together with the main program; they don't occupy space unless required. When a DLL file is needed, it is loaded and run. For example, as long as a user of Microsoft Word is editing a document, the printer DLL file is not required in RAM. If the user decides to print the document, then the Word application causes the printer DLL file to be loaded and run.

Promotes modular architecture

A DLL helps promote developing modular programs. It helps you develop large programs that require multiple language versions or a program that requires modular architecture. An example of a modular program is an accounting program having many modules that can be dynamically loaded at run-time.

Aid easy deployment and installation

When a function within a DLL needs an update or a fix, the deployment and installation of the DLL does not require the program to be relinked with the DLL. Additionally, if multiple programs use the same DLL, then all of them get benefited from the update or the fix. This issue may occur more frequently when you use a third-party DLL that is regularly updated or fixed.

Applications and DLLs can link to other DLLs automatically, if the DLL linkage is specified in the IMPORTS section of the module definition file as a part of the compile. Else, you can explicitly load them using the Windows LoadLibrary function.
For more details please check these links :
http://www.tutorialspoint.com/dll/
https://en.wikipedia.org/wiki/Dynamic-link_library
https://msdn.microsoft.com/en-us/library/windows/desktop/ms682589(v=vs.85).aspx
https://support.microsoft.com/en-in/kb/815065
Hope this will help you to understand Dll.
0
Ehsan Sajjad10y ago
You need to create a program using Visual Studio for that
0
Subash10y ago
thank you friend but searching for sample code
0
Ehsan Sajjad10y ago
Here is the definition of it form google:

"A dynamic link library (DLL) is a collection of small programs, any of which can be called when needed by a larger program that is running in the computer. The small program that lets the larger program communicate with a specific device such as a printer or scanner is often packaged as a DLL program (usually referred to as a DLL file). "

When you write some code, that needs to be shipped to server in case of web application and on client machine in case of desktop application, the source code we write gets compiled in case of .Net, code is converted in to another language which is called MSIL intermediate language which is stored in the DLL.
I hope it helps.
0