STDMETHOD

STDMETHOD is a macro used in C++ to declare function parameters for COM (Component Object Model) interfaces. COM is a binary standard for interfacing between different programming languages and operating systems, and it is commonly used in Windows programming. The macro is used to specify that a function takes a parameter that is an interface pointer.

The STDMETHOD macro is typically used in combination with the STDMETHODIMP macro, which is used to declare the return type of a method. The macro is defined as follows:

STDMETHOD(FunctionName, [...] );

This macro takes two parameters: the name of the function and a list of parameter declarations. The parameter declarations should include the data type and the parameter name, and should be separated by commas.

For example, when declaring a COM interface method that takes two string parameters and returns a result, the macro would be used as follows:

STDMETHODIMP MethodName(_In_ BSTR param1, _In_ BSTR param2)

_STDMETHODIMP is typically used to implement COM interfaces in Windows drivers and applications.

The STDMETHOD macro provides a way to specify the parameters of a COM interface method in a clear and concise manner. It is widely used in Windows programming and is a key part of the COM programming model.

The STDMETHOD macro is a part of the COM header files, and it is used in conjunction with other COM macros such as STDMETHODIMP and STDMETHOD945. These macros provide a way to implement COM interfaces and make them accessible to other applications.