Compatibility and Migration
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8/27/2008
When compiling C++ code you may encounter C2440 compiler errors in code that compiled successfully with previous versions of the CRT.
This happens because C++ overloads of some string functions with unsafe C prototypes have been added.
The functions are memchr, strchr, strpbrk, strrchr, strstr, wcschr, wcspbrk, wcsrchr, and wcschr. In previous versions, it was possible to pass a const string or buffer argument to any of these functions and assign its result to a non-const pointer, which could then be used to assign to the original const string. In C++, such unsafe usage of the functions is no longer allowed. To fix the errors, only assign the result of the functions to a const pointer if the argument is const. C code is not affected by this change.
Many CRT functions now validate parameters and call a handler function (_invalid_parameter_handler) if the validation fails. The default routine will report to Watson and terminate the current process. You can override this behavior with _set_invalid_parameter_handler.
See Also
Reference
Security-Enhanced CRT Functions for Windows Embedded CE