VC2015提示warning C4996: 'MBCS_Support_Deprecated_In_MFC': MBCS support in MFC is dep
当碰到这个警告时，查到原因如下：
1> CollisionModel_contacts.cpp
1>C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\atlmfc\include\afx.h(38): warning C4996: 'MBCS_Support_Deprecated_In_MFC': MBCS support in MFC is deprecated and may be removed in a future version of MFC.
1> C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\atlmfc\include\afx.h(33): note: see declaration of 'MBCS_Support_Deprecated_In_MFC'
1> CollisionModel_contents.cpp
1>C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\atlmfc\include\afx.h(38): warning C4996: 'MBCS_Support_Deprecated_In_MFC': MBCS support in MFC is deprecated and may be removed in a future version of MFC.
1> C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\atlmfc\include\afx.h(33): note: see declaration of 'MBCS_Support_Deprecated_In_MFC'
出现这样的警告，原因是因为：
由于历史原因，MFC同时支持 Unicode 和 MBCS（multi-byte character set），但 Unicode 日渐变得流行，而 MBCS 逐渐用得越来越少，所以，新版本的 MFC 已经把 MBCS 作为过时的方法，所以用新版本的 Visual Studio 编译 MBCS 程序的时候会出现这样的警告信息，建议大家在新的程序中废弃 MBCS 而采用 Unicode。
但是，对于已经采用 MBCS 的旧版的VC++程序，我们不打算将其迁移至 Unicode，又不想见到大量的 C4996 警告，怎么办呢？关闭编译器的 C4996 警告，需要在 preprocessor 定义中增加 NO_WARN_MBCS_MFC_DEPRECATION。
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