我正在寻求帮助来实现dll库中适当的内存释放。
我的项目结构如下:
Library.dll:
implementation.h还包含导出的功能:
extern "C" __declspec(dllexport) Base* __stdcall Create()
{
return new Derived;
}
extern "C" __declspec(dllexport) void __stdcall Delete(Base* B)
{
delete B;
}
Apllication.exe代码看起来像这样:
#include "interface.h"
#include "windows.h"
#include <iostream>
#include <memory>
typedef Base* (*CREATE_BASE)();
std::unique_ptr<Base> SmartPointer;
int main()
{
// Load the DLL
HINSTANCE dll_handle = ::LoadLibrary(TEXT("Library.dll"));
if (!dll_handle) {
std::cout << "Unable to load DLL!\n";
return 1;
}
// Get the function from the DLL
CREATE_BASE Fn = (CREATE_BASE)GetProcAddress(dll_handle, "Create");
if (!Fn) {
std::cout << "Unable to load Create from DLL!\n";
::FreeLibrary(dll_handle);
return 1;
}
// i have possibility to use only C++11 so creation of unique_ptr looks like this:
SmartPointer = std::unique_ptr<Base>(Fn());
// ... do something like SmartPointer->Action();
::FreeLibrary(dll_handle);
return 0;
}
上面的代码有效,我可以轻松地初始化Base对象并执行Derived类中的功能。现在,我想现在将导出的“ Delete
”函数用作自定义指针删除器。所以我准备了类型的定义:
typedef void (*DELETE_BASE)(Base* B);
而且我想像这样或多或少地使用它:
DELETE_BASE DeleteFn=(DELETE_BASE)GetProcAddress(dll_handle,"Delete");
SmartPointer = std::unique_ptr<Base>(Fn(),DeleteFn);
但是,我收到此unique_ptr定义不正确的编译器错误。如何解决?
我当前的解决方案基于:
由于要覆盖默认删除程序(请参考std::unique_ptr<>,因此必须指定删除程序功能的类型。
您使用过的地方:
std::unique_ptr<Base>
相反,您想使用:
std::unique_ptr<Base, DELETE_BASE>