为什么改了之后出现这些信息：
Linking...
nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __endthreadex
nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __beginthreadex
Debug/shiyan3.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.

shiyan3.exe - 3 error(s), 0 warning(s)