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In graphics file formats, the header might give information about an image's size, resolution, number of colors, and the like. In archive file formats, the file header might serve as a fingerprint or signature to identify the specific file format and corresponding software utility.
The C standard library is declared as a collection of header files. The C++ standard library is similar, but the declarations may be provided by the compiler without reading an actual file. C standard header files are named with a .h file name extension, as in #include <stdio.h>. Typically, custom C header files have the same extension. Custom ...
In the event that header file is included a second time, the #include guard will prevent the actual code within that header from being compiled. An alternative to #include guards is #pragma once . This non-standard but commonly supported directive among C and C++ compilers has the same purpose as an #include guard, but has less code and does ...
The Cache-Control: no-cache HTTP/1.1 header field is also intended for use in requests made by the client. It is a means for the browser to tell the server and any intermediate caches that it wants a fresh version of the resource. The Pragma: no-cache header field, defined in the HTTP/1.0 spec, has the same purpose. It, however, is only defined ...
In computer programming, a precompiled header (PCH) is a (C or C++) header file that is compiled into an intermediate form that is faster to process for the compiler.Usage of precompiled headers may significantly reduce compilation time, especially when applied to large header files, header files that include many other header files, or header files that are included in many translation units.
Header (computing), supplemental data at the beginning of a data block E-mail header; HTTP header; Header file, a text file used in computer programming (especially in C and C++) A pin header is a mainly male style of electrical connector on printed circuit boards, including motherboards, providing links to external devices
windows.h is a source code header file that Microsoft provides for the development of programs that access the Windows API (WinAPI) via C language syntax. It declares the WinAPI functions, associated data types and common macros. Access to WinAPI can be enabled for a C or C++ program by including it into a source file: #include <windows.h>
An ELF file has two views: the program header shows the segments used at run time, whereas the section header lists the set of sections.. In computing, the Executable and Linkable Format [2] (ELF, formerly named Extensible Linking Format) is a common standard file format for executable files, object code, shared libraries, and core dumps.