I registered dll file in window and included at QT in pro, with this code
INCLUDEPATH += $$PWD/(folder name)
DEPENDPATH += $$PWD/(folder name)
LIBS += -L$$PWD/laser/-l(dll file name)
and when i run qmake, it is working.
from now, how to call the function in dll file at cpp or header file? there is no header file for dll file.