Ipicture vtable all instances code#
Ipicture vtable all instances windows#

You can override this method with the DECLARE_OBJECT_DESCRIPTION macro. static LPCTSTR WINAPI GetObjectDescription() This static function retrieves the text description for your class object. static const CLSID& WINAPI GetObjectCLSID() Provides a consistent way of retrieving the object's CLSID. The last two versions return the result of the macro MAKE_HRESULT( 1, FACILITY_ITF, nID ). If hRes is zero, then the first four versions of Error return DISP_E_EXCEPTION. If the hRes parameter is nonzero, then Error returns the value of hRes. To call Error, your object must implement the ISupportErrorInfo Interface interface. By default, this parameter is _AtlModule::GetResourceInstance, where _AtlModule is the global instance of CAtlModule. The path and name of the help file describing the error. The help context identifier for the error.

In release builds, the error description string will be set to 'Unknown Error.' In debug builds, an ASSERT will result if nID does not index a valid string. This value should lie between 0x0200 and 0xFFFF, inclusively. The resource identifier where the error description string is stored. For more details about hRes, see Remarks. The HRESULT you want returned to the caller. The IID of the interface defining the error or GUID_NULL (the default value) if the error is defined by the operating system. The Unicode version of Error specifies that lpszDesc is of type LPCOLESTR the ANSI version specifies a type of LPCSTR. HINSTANCE hInst = _AtlBaseModule.GetResourceInstance()) HINSTANCE hInst = _AtlBaseModule.GetResourceInstance ()) This static function sets up the IErrorInfo interface to provide error information to the client. STDMETHODIMP CMyApp::CreateDocument( /* */ IDocument** ppDoc)

Ipicture vtable all instances code#

The code below shows how easy it to create instances of the document class using the CreateInstance member inherited from the CComCoClass base class. CApplication is a CoClass that provides a method on one of its own COM interfaces to create instances of the document class. The class is registered in the object map with the OBJECT_ENTRY_NON_CREATEABLE_EX_AUTO macro so clients can't create instances of the document using CoCreateInstance. In the following example, CDocument is a wizard-generated ATL class derived from CComCoClass that implements the IDocument interface. Note that the interface Q must have an IID associated with it that can be retrieved using the _uuidof operator. They are also useful in situations where you want to avoid the COM API for reasons of efficiency. These functions are useful for creating objects that you have prevented from being externally creatable by using the OBJECT_ENTRY_NON_CREATEABLE_EX_AUTO macro. The creation of the COM object is carried out by the class factory registered for this ATL class. The ATL class implementing the required COM object (that is, the class used as the first template parameter to CComCoClass) must be in the same project as the calling code. Use the first overload of this function for typical object creation use the second overload when you need to aggregate the object being created.

Ipicture vtable all instances windows#

See CoCreateInstance in the Windows SDK for a description of possible return values. The address of a pointer variable that receives the requested interface pointer if creation succeeds. The outer unknown or controlling unknown of the aggregate. The COM interface that should be returned via pp. Static HRESULT CreateInstance(IUnknown* punkOuter, Q** pp) Use these CreateInstance functions to create an instance of a COM object and retrieve an interface pointer without using the COM API. Header: atlcom.h CComCoClass::CreateInstance Remainder of class declaration omitted For example, to use CComClassFactory2 instead of CComClassFactory, specify the DECLARE_CLASSFACTORY2 macro: class ATL_NO_VTABLE CMењњlass2 : You can override either of these defaults by specifying another macro in your class definition. CComCoClass uses the following two macros:ДECLARE_CLASSFACTORY Declares the class factory to be CComClassFactory.ДECLARE_AGGREGATABLE Declares that your object can be aggregated. Any class registered in the object map should be derived from CComCoClass.Д¬ComCoClass also defines the default class factory and aggregation model for your object. (Static) Override to return the object's description.Д¬ComCoClass provides methods for retrieving an object's CLSID, setting error information, and creating instances of the class.

(Static) Returns the object's class identifier. (Static) Returns rich error information to the client. (Static) Creates an instance of the class and queries for an interface. Syntax template ДЄ pointer to the CLSID of the object. This class provides methods for creating instances of a class, and obtaining its properties.