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DLL hell is an umbrella term for the complications that arise when one works with dynamic-link libraries (DLLs) used with older Microsoft Windows operating systems, [1] particularly legacy 16-bit editions, which all run in a single memory space.
MSVCIRT.DLL – Microsoft C++ Library, contains the deprecated C++ classes from <iostream.h> (note the file extension) for MS C 9 and 10 (MSVC 2.x, 4.x) (Back then, the draft C++ Standard Library was integrated within MSVCRT.DLL. It was split up with the release of Visual C++ 5.0)
The Global Assembly Cache (GAC) is a machine-wide CLI assembly cache for the Common Language Infrastructure (CLI) in Microsoft's .NET Framework. The approach of having a specially controlled central repository addresses the flaws [citation needed] in the shared library concept and helps to avoid pitfalls of other solutions that led to drawbacks like DLL hell.
The Portable Executable (PE) format is a file format for executables, object code, dynamic-link-libraries (DLLs), and binary files used on 32-bit and 64-bit Windows operating systems, as well as in UEFI environments. [2]
The Windows API, informally WinAPI, is the foundational application programming interface (API) that allows a computer program to access the features of the Microsoft Windows operating system in which the program is running.
COM server DLLs are registered using regsvr32.exe, which places the DLL's location and its globally unique ID in the registry. Programs can then use the DLL by looking up its GUID in the registry to find its location or create an instance of the COM object indirectly using its class identifier and interface identifier.
In Unix-like operating systems using XCOFF, such as AIX, dynamically-loaded shared libraries use the filename suffix .a. The dynamic linker can be influenced into modifying its behavior during either the program's execution or the program's linking. A typical modification of this behavior is the use of the LIBPATH environment variable. This ...
These normally have reliable and non-conflicting addresses. So the copied DLL can use any kernel32.dll calls, f.e. to load another DLL with full advantages of a locally loaded DLL, i.e. having all relative library-dependencies. The path to that DLL is copied to the foreign address space and given as a void-parameter to the thread-function.