How to Disable Deprecated Warnings in MFC Window Applications, and Why _CRT_NONSTDC_NO_WARNINGS Doesn\'t Work?

The Usage of _CRT_SECURE_NO_WARNINGS

Compiling MFC window applications can sometimes lead to compile errors due to the deprecation of specific functions or variables. One such error involves the unsafe usage of strncpy. To address this issue, Visual Studio suggests disabling deprecation by using _CRT_SECURE_NO_WARNINGS.

In the case of the given project, adding _CRT_NONSTDC_NO_WARNINGS to the Preprocessor Definitions section of the project's Configuration Properties does not eliminate the error. This is because _CRT_NONSTDC_NO_WARNINGS is an incorrect directive.

The correct solution is to add _CRT_SECURE_NO_WARNINGS to the Preprocessor Definitions. This can be done by navigating to Configuration Properties -> C/C -> Preprocessor -> Preprocessor Definitions.

It is worth noting that adding _CRT_SECURE_NO_WARNINGS disables all deprecation warnings, not just those related to strncpy. If you wish to disable deprecation warnings for only specific functions, you can use the _CRT_DEPRECATE_NO_WARNINGS directive followed by the name of the particular function you want to suppress warnings for. For example, to disable warnings for strncpy only, you would use:

_CRT_DEPRECATE_NO_WARNINGS("strncpy")

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