Visual C++

Salut,
J'ai compilé un Programme en C++, lorsque je veux l'exécuter il me sort 5 erreurs .
ompiling...
Example1.cpp
Linking...
Example1.obj : error LNK2001: unresolved external symbol "int __stdcall DAPI_CloseDeviceInstance(void *)" (?DAPI_CloseDeviceInstance@@YGHPAX@Z)
Example1.obj : error LNK2001: unresolved external symbol "int __stdcall DAPI_WriteIoPorts(void *,unsigned long,unsigned long)" (?DAPI_WriteIoPorts@@YGHPAXKK@Z)
Example1.obj : error LNK2001: unresolved external symbol "int __stdcall DAPI_ConfigIoPorts(void *,unsigned long)" (?DAPI_ConfigIoPorts@@YGHPAXK@Z)
Example1.obj : error LNK2001: unresolved external symbol "void * __stdcall DAPI_OpenDeviceInstance(char *,unsigned char)" (?DAPI_OpenDeviceInstance@@YGPAXPADE@Z)
Debug/Essai1.exe : fatal error LNK1120: 4 unresolved externals
Error executing link.exe.

Essai1.exe - 5 error(s), 0 warning(s)

J 'ai essayé de faire
Tools/options/onglet directories/ Show directories for "libraryfiles"
Comme avait suggeré quelqu'un sans success.

Comment puis-je faire pour resoudre ce PB