error LNK2001:unresolved external symbol

我用的凌华DAQ2206的板卡，希望采模拟量输入，编译的时候没有错，但是连接的时候显示有错，AI_DAQ2206Dlg.obj : error LNK2001: unresolved external symbol _D2K_Release_Card@4
AI_DAQ2206Dlg.obj : error LNK2001: unresolved external symbol _D2K_AI_ContReadChannel@28
AI_DAQ2206Dlg.obj : error LNK2001: unresolved external symbol _D2K_AI_ContBufferSetup@16
AI_DAQ2206Dlg.obj : error LNK2001: unresolved external symbol _D2K_AI_Config@28
AI_DAQ2206Dlg.obj : error LNK2001: unresolved external symbol _D2K_AI_AsyncDblBufferMode@8
AI_DAQ2206Dlg.obj : error LNK2001: unresolved external symbol _D2K_AI_CH_Config@12
AI_DAQ2206Dlg.obj : error LNK2001: unresolved external symbol _D2K_AI_InitialMemoryAllocated@8
AI_DAQ2206Dlg.obj : error LNK2001: unresolved external symbol _D2K_Register_Card@8
Debug/AI_DAQ2206.exe : fatal error LNK1120: 8 unresolved externals
另外，DAQ的头文件我已经加到工程里了，请问是什么原因啊？
谢谢啦：）

没加lib文件，添加对应lib重新编译