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What is a DLL?Dynamic Link Libraries (DLL)s are like EXEs but they are not directly executable. They are similar to.so files in Linux/Unix. That is to say, DLLs are MS's implementation of shared libraries.DLLs are so much like an EXE that the file format itself is the same. Both EXE and DLLs are based on the Portable Executable (PE) file format. DLLs can also contain COM components and.NET libraries.What does a DLL contain?A DLL contains functions, classes, variables, UIs and resources (such as icons, images, files.) that an EXE, or other DLL uses.Types of libraries:On virtually all operating systems, there are 2 types of libraries. Static libraries and dynamic libraries. In windows the file extensions are as follows: Static libraries (.lib) and dynamic libraries (.dll).
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We would like to show you a description here but the site won’t allow us. A DLL file, short for Dynamic Link Library, is a type of file that contains instructions that other programs can call upon to do certain things. This way, multiple programs can share the abilities programmed into a single file, and even do so simultaneously. Before we get started on why you shouldn’t download Dynamic Link Library (DLL) files from the Internet, let’s first take a look at what DLL files are. A DLL file is a library that contains a set of code and data for carrying out a particular activity in Windows.
The main difference is that static libraries are linked to the executable at compile time; whereas dynamic linked libraries are not linked until run-time.More on static and dynamic libraries:You don't normally see static libraries though on your computer, because a static library is embedded directly inside of a module (EXE or DLL). A dynamic library is a stand-alone file.A DLL can be changed at any time and is only loaded at runtime when an EXE explicitly loads the DLL. A static library cannot be changed once it is compiled within the EXE.A DLL can be updated individually without updating the EXE itself.Loading a DLL:A program loads a DLL at startup, via the Win32 API LoadLibrary, or when it is a dependency of another DLL. A program uses the GetProcAddress to load a function or LoadResource to load a resource.Further reading:Please check or for further reading. Also the sources of this answer. What is a DLL?DLL files are binary files that can contain executable code and resources like images, etc. Unlike applications, these cannot be directly executed, but an application will load them as and when they are required (or all at once during startup).Are they important?Most applications will load the DLL files they require at startup.
If any of these are not found the system will not be able to start the process at all.DLL files might require other DLL filesIn the same way that an application requires a DLL file, a DLL file might be dependent on other DLL files itself. If one of these DLL files in the chain of dependency is not found, the application will not load. This is debugged easily using any dependency walker tools, like.There are so many of them in the system foldersMost of the system functionality is exposed to a user program in the form of DLL files as they are a standard form of sharing code / resources. Each functionality is kept separately in different DLL files so that only the required DLL files will be loaded and thus reduce the memory constraints on the system.Installed applications also use DLL filesDLL files also becomes a form of separating functionalities physically as explained above.
Good applications also try to not load the DLL files until they are absolutely required, which reduces the memory requirements. This too causes applications to ship with a lot of DLL files.DLL HellHowever, at times system upgrades often breaks other programs when there is a version mismatch between the shared DLL files and the program that requires them.
System checkpoints and DLL cache, etc. Have been the initiatives from M$ to solve this problem. The.NET platform might not face this issue at all.How do we know what's inside a DLL file?You have to use an external tool like or Dependency Walker which will not only show what publicly visible functions (known as exports) are contained inside the DLL files and also what other DLL files it requires and which exports from those DLL files this DLL file is dependent upon.How do we create / use them?Refer the programming documentation from your vendor.
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For C, refer to in MSDN. @RehanKhan Starting with.NET Framework v2.0, runtime will only load assembles compiled with a.NET version. DLLs (dynamic link libraries) and SLs (shared libraries, equivalent under UNIX) are just libraries of executable code which can be dynamically linked into an executable at load time.Static libraries are inserted into an executable at compile time and are fixed from that point. A DLL is a library that contains codeand data that can be used by more thanone program at the same time. Forexample, in Windows operating systems,the Comdlg32 DLL performs commondialog box related functions.Therefore, each program can use thefunctionality that is contained inthis DLL to implement an Open dialogbox. This helps promote code reuse andefficient memory usage.By using a DLL, a program can bemodularized into separate components.For example, an accounting program maybe sold by module. Each module can beloaded into the main program at runtime if that module is installed.Because the modules are separate, theload time of the program is faster,and a module is only loaded when thatfunctionality is requested.Additionally, updates are easier toapply to each module without affectingother parts of the program.
Forexample, you may have a payrollprogram, and the tax rates change eachyear. When these changes are isolatedto a DLL, you can apply an updatewithout needing to build or installthe whole program again.