passing stl objects across dll boundary

本文深入探讨了在C++中调用成员函数导致内存访问违规的问题,特别是当成员函数创建临时对象且该对象超出作用域时,如何在主要应用程序中正确处理这些情况,以避免程序崩溃。

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In a dll, suppose we have a class member function to return a string member:

string get_name() {return string;}


In another module, for example, the main application try to use the function to get the name string:

myobj.get_name();


This seems to be perfect OK, but in reality, this will cause memory access violation and program crash. The reason:

When call myobj.get_name(), inside the DLL, it will create a temp object in the dll memory space. After the call is done, the main application tries to delete the temporary object, but the temp object is not inside the main application memory space and it is not allowed.


To fix this, change the member function to:

const string& get_name() {return name;}




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