有多少分，我都都给了!帮忙解决一个问题。

电信给了我一个dll，和一个头文件，我把它copy到我的工程项目里面，可是我引用它的头文件出错，但是出现下面的错误。enerating Code...
Linking...
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_login(struct t_ocpe_conn *,char *,char *,unsigned long)" (__imp_?ocpe_login@@YAHPAUt_ocpe_conn@@PAD1K@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_connect(struct t_ocpe_conn *,char const *,unsigned short)" (__imp_?ocpe_connect@@YAHPAUt_ocpe_conn@@PBDG@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit(struct t_ocpe_conn *,struct t_ocpe_submit *,unsigned long)" (__imp_?ocpe_submit@@YAHPAUt_ocpe_conn@@PAUt_ocpe_submit@@K@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit_sm_set_msg(struct t_ocpe_submit *,char *,int)" (__imp_?ocpe_submit_sm_set_msg@@YAHPAUt_ocpe_submit@@PADH@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit_sm_set_msgfmt(struct t_ocpe_submit *,unsigned long)" (__imp_?ocpe_submit_sm_set_msgfmt@@YAHPAUt_ocpe_submit@@K@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit_sm_set_sndfee(struct t_ocpe_submit *,unsigned long)" (__imp_?ocpe_submit_sm_set_sndfee@@YAHPAUt_ocpe_submit@@K@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit_sm_set_fee(struct t_ocpe_submit *,unsigned long)" (__imp_?ocpe_submit_sm_set_fee@@YAHPAUt_ocpe_submit@@K@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit_sm_set_paynum(struct t_ocpe_submit *,char *)" (__imp_?ocpe_submit_sm_set_paynum@@YAHPAUt_ocpe_submit@@PAD@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit_sm_set_srcnum(struct t_ocpe_submit *,char *)" (__imp_?ocpe_submit_sm_set_srcnum@@YAHPAUt_ocpe_submit@@PAD@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit_sm_set_sendtime(struct t_ocpe_submit *,char const *)" (__imp_?ocpe_submit_sm_set_sendtime@@YAHPAUt_ocpe_submit@@PBD@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit_sm_add_dstnum(struct t_ocpe_submit *,char *)" (__imp_?ocpe_submit_sm_add_dstnum@@YAHPAUt_ocpe_submit@@PAD@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit_sm_set_svctype(struct t_ocpe_submit *,char *)" (__imp_?ocpe_submit_sm_set_svctype@@YAHPAUt_ocpe_submit@@PAD@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit_sm_set_ismg(struct t_ocpe_submit *,char *)" (__imp_?ocpe_submit_sm_set_ismg@@YAHPAUt_ocpe_submit@@PAD@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_submit_sm_init(struct t_ocpe_submit *)" (__imp_?ocpe_submit_sm_init@@YAHPAUt_ocpe_submit@@@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_deliver_resp(struct t_ocpe_conn *,unsigned long)" (__imp_?ocpe_deliver_resp@@YAHPAUt_ocpe_conn@@K@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_activetest_resp(struct t_ocpe_conn *,unsigned long)" (__imp_?ocpe_activetest_resp@@YAHPAUt_ocpe_conn@@K@Z)
sendMessageFlow.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) int __cdecl ocpe_recv(struct t_ocpe_trans *,struct t_ocpe_conn *,unsigned short)" (__imp_?ocpe_recv@@YAHPAUt_ocpe_trans@@PAUt_ocpe_conn@@G@Z)
Debug/TrayTest.exe : fatal error LNK1120: 17 unresolved externals
Error executing link.exe.这个错误如何解决??是不是我引用头文件的方法不对?、谢谢!