ustream ppv

also done through the interface. This interface is IUnknown. The definition of the IUnknown interface is contained in the header file of UNKNOWN.H in the Win32 SDK, which is referenced as follows:Interface IUnknown{Virtual Hresult-_ _stdcall QueryInterface (const iid iid,void **PPV) = 0;Virtual Ulong_ _stdcall AddRef () = 0;Virtual Ulong_ _release () = 0;};All COM has to inherit the IUnknown. Other interfaces of the component can be queried with IUnk

COM, an interface is a memory structure that contains an array of function pointers, and the array element is a function address that is implemented by the component. FAQ4: What is the function of the interface? Chapter II Answer: There is an interface for how components connect them together to form an application. In COM, the interface is everything, to the customer that the component is the interface set, customers can only through interfaces and components to deal with. Demonstrates that t

pointer.For some complex inheritance relationships, there are pitfalls in using dynamic_cast for conversion; For example, a structure like this: The D type can be safely converted to type B and C, but the D type is directly convertible to type a? Copy Code code as follows: Class A { virtual void Func () = 0; }; Class B:public A { void Func () {}; }; Class C:public A { void Func () {}; }; Class D:public B, public C { void Func () {} }; int main

that it cannot handle ring references, and if the two objects in the loop are neither unreachable nor recyclable, because they are referenced to each other and their respective count values are not 0, this situation is powerless for the reference counting algorithm, while other garbage collection algorithms can handle ring references well.The most famous use of the reference counting algorithm is Microsoft's COM technology, the famous IUnknown interface: 1:interface IUnknown 2: { 3:

one of the principles and implementation of COM COM component is actually a special object system, follow a unified standard, so that each software can access the object in some way, can do component calls. COM is the unified standard-invoking COM components through interfaces. An interface is the only thing that a COM component can be perceived by the outside world. Interfaces for all interfaces inherit from IUnknown, implementing interface queries and reference counts. Contains 3 methods:

CLR, and so on. An unmanaged program that wants to start the CLR must also reference MSCOREE.DLL, using its export function to load managed code and perform operations such as customizing the CLR. Now that the focus is on MSCOREE.DLL, let's look at it together.View header files for MSCOREE.DLL We have no way to view the source code for the MSCOREE.DLL file, but the Framework SDK provides a mscoree.h file that can be viewed in the relevant version of the SDK installation directory. Because the

(Pv.contains ("team")) { propertyvalue ppv= pv.getpropertyvalue ("name"); Typedstringvalue obj= (Typedstringvalue) ppv.getvalue (); if (Obj.getvalue (). Equals ("Messi")) { pv.addpropertyvalue ("team", "Argentina"); } } Bdefine.setscope (Beandefinition.scope_prototype); }} Call class: public static void Main (string[] args) throws Exception { Ap

The pre-course is a PE file structure and DLL dynamic connection technology. If you do not know the PE file structure (this chapter is not very important, but this is a basic and basic content, for more information about the compilation and Loading Principles and the memory structure, see the official PE File Format documentation. If you have not written the DLL, see Chapter 19 and 20 of Windows core programming. Return to the correct question. here we need to do a COM component server-using the

iunknown interface does not expose the request interface. However, this function is actually implemented by calling the cogetclassobject function: CoGetClassObject(rclsid,NULL ,dwClsContext, IID_IClassFactory, pCF);hresult = pCF->CreateInstance(pUnkOuter, riid, ppv);pCF->Release(); 2. Use cogetclassobject to create a COM object. Cogetclassobject does not directly create COM components, but creates a factory class, and then creates a COM object for

main function of the function is to load the CLR. CorBindToRuntimeEx function Definition:HRESULT CorBindToRuntimeEx ([In] LPWStr pwszversion,[In] LPWStr Pwszbuildflavor,[In] DWORD Startupflags,[In] Refclsid Rclsid,[In] REFIID riid,[out] lpvoid* PPV);Pwszversion describes the version of the CLR to be loaded.A Pwszbuildflavor string that specifies whether to load the server version of the CLR or the workstation version. Values: SVR and wks.Startupflags

Learning Demo //environment: vs2005//blog:pppboy.blog.163.com//------------------- --------------------------------- #include "stdafx.h" #include OutputBase called:0Mid1 calledBase called:1Mid2 calledChild calledBase PrintBase PrintVirtual Inheritance:#include "stdafx.h" #include 4. Summaryin the case of multiple inheritance, the virtual base class keyword has the same scope and inheritance as the keyword, and only works on the base class immediately following it. After a virtual base class

the site's traffic, for corporate websites, traffic is not representative of the good optimization, more important indicators are trading orders. This time, it is necessary to see the authenticity of the flow, from the flow of IP and the flow of the bounce rate to see. If even the IP number of the site does not increase, the site jump rate is very high optimization is also one of the optimization of failure. Four, the Web site rankings and ranking of Chinese websites, although this can be done

("F614FB00-6702-11d4-B0B7-0050BABFC904")) ImyInterface : public IUnknown { 　　STDMETHOD(Square)(long *pVal)PURE; 　　STDMETHOD(Cube)(long *pVal)PURE; }; 客户端使用此接口： HRESULT hr; ImyInterface *pmine=(0); hr = CoCreateInstance(CLSID_Mine,　　　　　　　 // COM 服务器的CLSID 　　　　　　　　　　　NULL,　　　　　　//不支持聚合 　　　　　　　　　　　CLSCTX_INPROC_SERVER,　　 // 是个DLL 　　　　　　　　　　　__uuidof(ImyInterface),　 // 接口的IID 　　　　　　　　　　　(void**)pmine 　　　　　　　　　　　); Another way to get the CLSID of a COM object from the registry is to call the CLSIDFr

implementing COM interfaces (as MFC prefers, ATL tends to use multiple inheritance)" and "Aggregation (AGGREGATION)" in COM components. A COM component (Component) is a concept based on a binary object protocol. It can also be understood that this is a binary sense of "class". A COM component that exposes not a set of methods (method) but a set of interfaces (Interface). The concept of Interface (INTERFACE) is widely used and is generally referred to as "class specification (Contract)". Under

current memory pointer to the specified positionVirtual BOOL comparedata (void* pbuffer); Compare values in two segments of memoryVirtual ULONG Length (){return m_cbufsize;};Virtual operator void* Const (){return m_pbuffer;};PublicStdmethodimp_ (ULONG) AddRef (void);Stdmethodimp_ (ULONG) Release (void);STDMETHODIMP QueryInterface (REFIID riid, lpvoid *PPV); Read-Write memory operations, these are functions that must be implementedSTDMETHODIMP Read (

. The better the performance, the more discounted the quality of the picture, the better the quality, the more sacrificing performance. Need to find a balance of your satisfaction. Just learn UE4 four months, there is no understanding and said the wrong place also ask you to forgive. As Blakblt here, the default Vxgi settings seem to try to simulate the quality of the lights that have been built. This is good for architectural visualizations and smaller, more controllable scenarios, but may be

. The first thing you can see is the overhead of the time, each time the object is created or released, the reference count value is computed , which raises some additional overhead, and the second is the overhead of the space , because each object maintains its own number of references, Additional space is required to hold the reference count value; The biggest drawback of the reference counting algorithm is that it cannot handle ring references , as shown in the following illustration: The tw

Ppv.vendor_type_lookup_code= ' C_vendor ' and ' Then ' cost funding class suppliers 'When ppv.vendor_type_lookup_code= ' Vendor ' then ' Supplier 'When ppv.vendor_type_lookup_code= ' public SECTOR COMPANIES ' then ' PR Department company 'When ppv.vendor_type_lookup_code= ' taxes Authority ' then ' the tax authority 'When ppv.vendor_type_lookup_code= ' employee ' then ' employees 'When Ppv.vendor_type_lookup_code= ' S_vendor ' and ' Then ' Install maintenance class supplier 'When ppv.vendor_typ