Can two applications use the same DLL?

Can two applications use the same DLL?

It’s possible. You could install the DLL in the GAC (requires strong named assemblies) in order for both applications to have easy access to it. Or stick it in a folder and have both apps search that folder for the dll.

How do I use two versions of the same DLL in the same project?

Under , add a tag for each version of the DLL. This will resolve the runtime assembly loading conflict. That’s it, now we can use both versions as we please.

Are DLLs shared?

DLLs will not be shared. If two processes use the same DLL each process has a own copy and the stored data of variabled declared in the DLL will not interfere the values of the dll of the other process.

Why is dll bad?

DLLs have no built-in mechanism for backward compatibility, and even minor changes to the DLL can render its internal structure so different from previous versions that attempting to use them will generally cause the application to crash.

What is difference between dll and lib?

LIB vs DLL The difference between LIB and DLL is that DLL files are reusable as they only need to be linked to the previous DLL, while LIB does not possess this quality and the code has to be copied from the previous to the newer program. DLL is a dynamic link library that compiles at run-time by the loader.

How do you reference different versions of the same?

2 Answers

1. Remove the existing reference (ex: log4net.dll) from the project.
2. Add a folder to the project to store the several dll (ex: /Libs)
3. Add the several dll in it and give them unique file names (like log4net.1.2.10.0.dll, log4net.1.2.15.0.dll)

How do I find Publickeytoken?

The public key token is a unique 16-character key that is given to the assembly when it is built and signed in Microsoft Visual Studio. To determine the public token key, you can run the Strong Name tool (sn.exe) on the assembly. The sn.exe is available with the Microsoft . NET Framework SDK.

What is shared DLLs in Windows 10?

Shared DLLs are basically DLL files that are shared between many different apps. Additionally, there are many common DLLs that are used by most, if not all, Windows applications. Your Windows Registry includes a path to each of these DLLs, whether the DLL is used by none, one, or many applications.

How many types of linking are there in DLL?

two
Types of DLLs The two methods of linking are load-time dynamic linking and run-time dynamic linking.

What is malicious DLL?

A DLL (Dynamic Link Library) file is an executable file that allows applications to share code to perform one or more predetermined functions. Most DLL files are very useful and aid in the process of running your applications. However, others are malicious, acting as browser hijackers or Trojan horses.

Should I use LIB or DLL?

LIB is a static library where functions and procedures can be placed and called as the application is being compiled. A DLL or Dynamic Link Library does the same function but is dynamic in a sense that the application can call these libraries during run-time and not during the compilation.

What does it mean to have multiple instances of a DLL?

Thanks for any help. You mentioned that you have multiple instances inside your app, which implies that they all live inside the same process. Singletons like any other static member are limited to one per application regardless of whether they belong to an object loaded from a DLL etc.

Can a DLL have more than one singleton?

Any static member defined in there is static for the process (a loaded DLL doesn’t have its own memory). You’ll have to write a non-standard “singleton” to get multiple objects. And if you don’t have the sources to the dll, then you must load it in different processes, one “singleton” per process.

What happens if you have two versions of the same DLL?

Both libraries have the same namespace, causing ambiguity the compiler can’t handle. It won’t run. The referenced DLLs are copied to the output dir, but because they have the same name, they will override each other, and will cause the runtime loading of the assembly to have a version mismatch. Welcome to DLL hell.

Can a DLL be treated as an object?

You are treating a DLL like an object instance. That’s not at all how DLLs work. DLLs are not objects, they are a bunch of code and resources. These things do not change, no matter how many times you could theoretically load a DLL. Thus there would be no point in having multiple instances of the DLL loaded in the same process.