#includeIn this example, we first initialize the COM library by calling the CoInitialize function. Then we create a string object and obtain its IUnknown interface using the QueryInterface method. We then create a CMyComPtr object to manage the IUnknown interface and call the Detach method to release control of the managed interface. Finally, we verify that the interface was detached correctly and release the COM library by calling CoUninitialize. The package library for CMyComPtr is the Microsoft Active Template Library (ATL). This library provides a set of C++ classes and templates for creating COM objects and managing COM interfaces.#include #include int main() { CoInitialize(nullptr); CString str = "Hello, world!"; IUnknown* pUnknown = nullptr; str.QueryInterface(IID_IUnknown, (void**)&pUnknown); CMyComPtr pIUnknown(pUnknown); IUnknown* pDetachedUnknown = pIUnknown.Detach(); if (pDetachedUnknown != nullptr) { std::cout << "Detached successfully!" << std::endl; } CoUninitialize(); return 0; }