![]() When drawing to a printer, the API calls had to be transformed into requests to a printer. On the display, it had to manipulate pixels in the frame buffer. ![]() Graphics Device Interface code in GDI needed to translate drawing commands to operations on specific devices. These extra layers on top of DOS had to be shared across all running windows programs, not just to enable Windows to work in a machine with less than a megabyte of RAM, but to enable the programs to co-operate amongst each other. The Drawing API, GDI, was implemented in a DLL called GDI.EXE, the user interface in USER.EXE. All higher level services were provided by Windows Libraries Dynamic Link Libraries. All Operating-System level operations were provided by the underlying operating system: MS-DOS. Every program was meant to co-operate by yielding the CPU to other programs so that the GUI was capable of multitasking and could be as responsive as possible. The first versions of Microsoft Windows ran every program in a single address space. Examples of such DLLs include icon libraries, sometimes having the extension ICL, and font files, having the extensions FON and FOT. In the broader sense of the term, any data file with the same file format can be called a resource DLL. As with EXEs, DLLs can contain code, data, and resources, in any combination. The file formats for DLLs are the same as for Windows EXE files - that is, Portable Executable (PE) for 32-bit and 64-bit Windows, and New Executable (NE) for 16-bit Windows. These libraries usually have the file extension DLL, OCX (for libraries containing ActiveX controls), or DRV (for legacy system drivers). (September 2008)Ĭom.microsoft.windows-dynamic-link-libraryĭynamic-link library (also written without the hyphen), or DLL, is Microsoft's implementation of the shared library concept in the Microsoft Windows and OS/2 operating systems. Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article does not cite any references or sources.
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