visual studio 编译错误C4996 xxxx: This function or variable may be unsafe. Consider using xxxx instead

错误C4996 xxxx: This function or variable may be unsafe. Consider using xxxx instead.

To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

需注意平台，两个平台（win32和x86）最好添加这个_CRT_SECURE_NO_WARNINGS宏。