#OpenCV-copy.pri
win32 {
    OPENCV_BIN = $$PWD/D:/MyQtLibs/OpenCV_Install/x64/mingw/bin   # 改成你的路径
    DLL_SRC    = $$OPENCV_BIN/*.dll
    DLL_DST    = $$OUT_PWD

    # 用 $$system_path() 把路径转成当前系统分隔符
    QMAKE_POST_LINK += $$quote(cmd /c copy /y $$system_path($$DLL_SRC) $$system_path($$DLL_DST))
}