MLEn

mLen is a shorthand variable name used in programming to denote the length of a message, data block, or buffer. It is not part of a universal standard; its exact meaning depends on the context and the codebase in which it appears.

In practice, mLen is often used alongside a pointer or array to indicate how many bytes or characters should be processed. Common patterns include passing mLen to functions as the number of elements to read, copy, or encode, and using mLen to guard against buffer overflows or to determine iteration bounds.

Examples across domains include C or C++ code where mLen might be used in calls such as memcpy(dest, src, mLen) or as an output parameter that supplies the length of data processed. In audio, MIDI, or other data-handling contexts, mLen may represent the number of data bytes in a message or the length of a payload. In networking or protocol implementations, mLen can denote the length of a framed or captured message.

Because mLen is not standardized, developers should consult the specific API documentation or source code to determine its exact meaning, including the unit (bytes versus characters), whether it excludes headers, and how it interacts with signed or unsigned types. Clear documentation and consistent usage of mLen help ensure correct memory access and reliable data handling.