result 是一个 static 局部变量，因此即使在函数退出后它也会存在。不要将其与非静态局部变量混淆。

No. result is a static local variable, so it will exist even after the function exit. Don't confuse this with non-static local variable.

:: $ c> ：CLSIDFromString 告诉编译器从全局命名空间中选择 CLSIDFromString ，如果存在 CLSIDFromString 在其他命名空间中定义，在调用站点可见。

:: in ::CLSIDFromString tells the compiler to choose CLSIDFromString from the global namespace, in case if there are many definition of CLSIDFromString defined in other namespace(s), visible at the call-site.