头文件
#ifndef labviewDvp2Api_H
#define LabviewDvp2Api_H

#define LabviewDvp2Api extern "C"  __declspec(dllimport)//



LabviewDvp2Api int dvpViSetAnalogGain(int item, int count);

#endif //LabviewDvp2Api_H

修改这样也不行

#ifndef LabviewDvp2Api_H
#define LabviewDvp2Api_H

#define LabviewDvp2Api   __declspec(dllimport)

extern "C"{
LabviewDvp2Api int dvpViSetAnalogGain(int item, int count);
}
#endif //LabviewDvp2Api_H



该怎样定义？