SmpTl是CaptureController的定义名称空间，由MOC找到.

SmpTl is the namespace CaptureController is defined in, as it was found by MOC.

Q_OBJECT宏在类定义内扩展为staticMetaObject变量的声明(除其他内容外). MOC文件包含该变量的定义.

The Q_OBJECT macro expands into the declaration of the staticMetaObject-variable inside your class definition (among other things it expands into). The MOC-file contains the definition of that variable.

如果这不正确，请发布您的Qt版本和头文件的精简版本.

If this is not correct, please post your Qt version and a stripped down version of your header-file.