ActiveX programming unleashed by Weiying Chen

By Weiying Chen

A consultant to net programming with ActiveX. The booklet covers ActiveX Controls, lively scripts, ActiveX files, web Server API (ISAPI), low and high point interfaces for downloading info from the net, ActiveX Server Framework and sceurity and optimization matters for ActiveX programmers

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Release Method The Release method decrements the reference count. If the reference count is zero, the object should destroyed since the object is no longer needed. The client application needs to invoke this method whenever the interface is not accessed. 4 demonstrates an implementation of the Release method. 4. Release method implementation. STDMETHODIMP_(ULONG) CLowerStr::Release() { m_dwRef--; if(m_dwRef == 0) delete this; return m_dwRef; } IClassFactory Interface IClassFactory is the interface that class factory object inherits from.

5. For the complete project, please refer to the lst31 directory on the CD. 5. dll COM server There is one interface ILowerStr exposed by the CLowerStr object. There is only one method called Lower in this interface. virtual STDMETHODIMP Lower(char *lpInput, char**lpOutput) = 0; This method accepts an input and converts the input string to lowercase and then returns the input string to the caller. In particular, lpInput in Lower method indicates the input string. lpOutput indicates the returned string that converts the strInput to uppercase.

Because OLE is an object-oriented architecture founded on the COM, it is an extendible services architecture. Each OLE component is a building block for the rest of the technologies. Microsoft has extended this architecture to ActiveX to facilitate the creation of Internet-enabled applications. ActiveX builds on OLE and COM and adds new technologies of its own. ActiveX Controls are Internet-aware controls that are nothing more than an extension of the OLE Control architecture and make it easy to extend the use of reusable components on the Internet.

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