The new home for Visual Studio documentation is Visual Studio 2017 Documentation on docs.microsoft.com.

The latest version of this topic can be found at C28196.

warning C28196: The requirement is not satisfied. (The expression does not evaluate to true.)

This warning indicates that the function prototype for the function being analyzed has a __notnull, __null or __drv_valueIs on an _Out_ parameter or the return value, but the value returned is inconsistent with that annotation.