//编译的时候,是有3个选项的
a) As DLL
b) As Static Library, for using MFC as DLL
c) As Static Library, for using MFS as static library.
//我选择了b,所以,生成以上libs:S.lib, SD.lib, SU.lib, SUD.lib.
//如果选择了c),则会生成DS.lib, DSD.lib, DSU.lib, DSUD.lib//前面的D表示using mfc as dll
//如果选择了a),则会生成" ".dll, D.dll, U.dll, UD.dll.