这里是错误:Error2errorLNK2019:unresolvedexternalsymbol"protected:__thiscallCSourceSeeking::CSourceSeeking(charconst*,structIUnknown*,long*,classCCritSec*)"(??0CSourceSeeking@@IAE@PBDPAUIUnknown@@PAJPAVCCritSec@@@Z)referencedinfunction"public:__thiscallCPushPin::CPushPin(long*,classCSource*)"(??0CPush