HRESULT

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HRESULT is a computer programming data type that represents the completion status of a function. It is used in the source code of applications targeting Microsoft Windows and earlier IBM/Microsoft OS/2 operating systems, but its design does not limit its use to these environments; it can be used in any system supporting 32-bit integers. The original purpose of HRESULT was to lay out ranges of status codes for both public and Microsoft internal use in order to prevent collisions between status codes in different subsystems of the OS/2 operating system. An HRESULT is designed to simultaneously be both a simple numerical value and a structure of fields indicating severity, facility and status code. Use of HRESULT is most commonly encountered in COM programming, where it forms the basis for a standardized error handling mechanism, but its use is not limited to COM. For example, it can be used as an alternative to the more traditional use of a boolean pass/fail result.