编译live555库（参考http://fancylife.blog.51cto.com/920524/197406）后，编译
testOnDemandRTSPServer.cpp时出现错误：
GroupSock.lib(NetAddress.obj) : error LNK2001: unresolved external symbol _our_inet_addr
GroupSock.lib(GroupsockHelper.obj) : error LNK2001: unresolved external symbol _our_inet_addr
BasicUsageEnvironment.lib(BasicUsageEnvironment.obj) : error LNK2001: unresolved external symbol _initializeWinsockIfNecessary
GroupSock.lib(GroupsockHelper.obj) : error LNK2001: unresolved external symbol _initializeWinsockIfNecessary
LiveMedia.lib(RTSPServer.obj) : error LNK2001: unresolved external symbol _our_random32
LiveMedia.lib(RTPSink.obj) : error LNK2001: unresolved external symbol _our_random32
LiveMedia.lib(RTPSource.obj) : error LNK2001: unresolved external symbol _our_random32
LiveMedia.lib(RTPSink.obj) : error LNK2001: unresolved external symbol _our_random
LiveMedia.lib(RTCP.obj) : error LNK2001: unresolved external symbol _our_random
GroupSock.lib(GroupsockHelper.obj) : error LNK2001: unresolved external symbol _our_random
GroupSock.lib(GroupsockHelper.obj) : error LNK2001: unresolved external symbol _our_srandom
Debug/Server.exe : fatal error LNK1120: 5 unresolved externals
其实是编译库时添加文件时只添加了.cpp文件，liveMedia和Groupsock中有几个.c文件没有添加进去，使得一些函数或参数没有定义
添加完.c文件，继续编译库，然后编译testOnDemandRTSPServer.cpp，通过