视频会议管理系统源码

视频会议管理系统源码，但有一点点小问题，运行时出现错误：
E:\ChatEP\ChatEPDlg.cpp(271) : error C2065: 'StrToInt' : undeclared identifier
MyEndPoint.cpp
E:\ChatEP\MyEndPoint.cpp(121) : error C2065: 'KEY_AUDIO_INPUT_DEVICE' : undeclared identifier
E:\ChatEP\MyEndPoint.cpp(126) : error C2065: 'KEY_AUDIO_OUTPUT_DEVICE' : undeclared identifier
E:\ChatEP\MyEndPoint.cpp(158) : error C2065: 'ID_SEND_VIDEO' : undeclared identifier
E:\ChatEP\MyEndPoint.cpp(164) : error C2065: 'ID_REMOTE_VIDEO' : undeclared identifier
E:\ChatEP\MyEndPoint.cpp(184) : error C2065: 'KEY_VIDEO_DEVICE' : undeclared identifier
E:\ChatEP\MyEndPoint.cpp(206) : error C2065: 'ID_LOGOUT' : undeclared identifier
E:\ChatEP\MyEndPoint.cpp(214) : error C2065: 'ID_LOGIN' : undeclared identifier
Generating Code...
Error executing cl.exe.

ChatEP.exe - 8 error(s), 0 warning(s)

这是源码