静态MFC，在线程中使用SOCKET，发生错误：
Debug Assertion Failed!
Program:...
File:f:\rtm\vctools\vc7libs\ship\atlmfc\src\mfc\map_pp.cpp
Line:179
这是MFC的一个BUG，在6.0中就发现，可惜微软到VS2013还是没有修改，估计这个东西微软也要淘汰了，懒得改了，下面是MSDN的解决方法：
When using MFC sockets in secondary threads in a statically linked MFC
Visual C++ 6.0 application, an unhandled exception occurs. The reason for
the unhandled exception is that an object of type CMapPtrToPtr pointer,
pointed to by m_pmapSocketHandle, is never created.
To resolve it the handle maps used by the sockets need to be created for
each thread.The following code shows a function to do this:
void SocketThreadInit()
{
#ifndef _AFXDLL
#define _AFX_SOCK_THREAD_STATE AFX_MODULE_THREAD_STATE
#define _afxSockThreadState AfxGetModuleThreadState()
_AFX_SOCK_THREAD_STATE* pState = _afxSockThreadState;
if (pState->m_pmapSocketHandle == NULL)
pState->m_pmapSocketHandle = new CMapPtrToPtr;
if (pState->m_pmapDeadSockets == NULL)
pState->m_pmapDeadSockets = new CMapPtrToPtr;
if (pState->m_plistSocketNotifications == NULL)
pState->m_plistSocketNotifications = new CPtrList;
#endif
}
This function should be called once in each secondary thread before the
first socket is created in the new thread.
IMP : This bug was corrected in Visual Studio 6.0 Service Pack 3
最后这句就是屁话了，我在2013中试了，还是错误，可恶！