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What is a CComPtr?

What is a CComPtr?

CComPtr provides a specialization for IDispatch that enables it to store pointers to COM automation components and invoke the methods on the interface by using late binding. CComDispatchDriver is a typedef for CComQIPtr , which is implicitly convertible to CComPtr .

How do you create a smart pointer in C++?

Declare the smart pointer as an automatic (local) variable. (Do not use the new or malloc expression on the smart pointer itself.) In the type parameter, specify the pointed-to type of the encapsulated pointer. Pass a raw pointer to a new -ed object in the smart pointer constructor.

What is a COM pointer?

The Pointer in C, is a variable that stores address of another variable. A pointer can be incremented/decremented, i.e., to point to the next/ previous memory location. The purpose of pointer is to save memory space and achieve faster execution time.

What is ATL C++?

The Active Template Library (ATL) is a set of template-based C++ classes that let you create small, fast Component Object Model (COM) objects. NET attributes, which is designed to simplify COM programming. For more information, see Attributed Programming.

What is query interface?

Query interface is a type-safe way to achieve a safe downcasting and to allow interfaces to be aggregated to an object. Objects using the query interface must inherit from the Interface base class. This pointer value will be returned null if the node doesn’t support the requested interface.

Is C++ modern?

The simple answer is. Modern C++ stands for C++ that is based on C++11, C++14, and C++17. If you look at the sheer amount of features we got since C++11 and the reason for their impact, you must come to the conclusion: C++ before 2011 and since 2011 are different languages.

What is weak pointer in C++?

std::weak_ptr is a smart pointer that holds a non-owning (“weak”) reference to an object that is managed by std::shared_ptr. It must be converted to std::shared_ptr in order to access the referenced object. To prevent this, one of the pointers in the cycle can be made weak.

How to create and use ccomptr in Win32?

The following example shows how to use CComPtr to instantiate a COM object and obtain pointers to its interfaces. Notice that the CComPtr::CoCreateInstance member function is used to create the COM object, instead of the Win32 function that has the same name. void CComPtrDemo() { HRESULT hr = CoInitialize (NULL); // Declare the smart pointer.

How to visualize your code in Visual Studio?

Visualize your code with syntax colorization, guidelines, code tooltips, Class View, or Call Hierarchy. Navigate to any code symbol by reference, definition, declaration, and more. Autocomplete your code as you type, quickly repair problems, and refactor your code to your needs. Analyze your code for common issues.

What is the use of ccomqiptr in C + +?

CComQIPtr is for cases when you want to call QueryInterface () in a convenient manner to know whether an interface is supported: IInterface1* from =

How to create a COM object in ccomptr?

The following example shows how to use CComPtr to instantiate a COM object and obtain pointers to its interfaces. Notice that the CComPtr::CoCreateInstance member function is used to create the COM object, instead of the Win32 function that has the same name.