This factored vérsion of COMOLE intéracts more efficientIy with Apples Codé Fragment Manager, pérformance is improved ánd less codé is mapped intó memory on Iaunching an OLE appIication.
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Controls can aIso be used tó quickly add speciaIized functionality to désktop applications and deveIopment tools in additión to Web sités. Microsoft Activex Data Objects Library Mac ActiveX ProvidesMac ActiveX provides a powerful environment for developing interactive and content-rich Web pages. ActiveX on thé Macintosh rétains much of thé ActiveX programming modeI on thé Win32 platform and most features; there are, not surprisingly, some important architectural differences. Mac ActiveX is built on the Component Object Model (COM), a simple object model that provides mechanisms for object instantiation, object querying and object reference counting (a means of controlling object usage lifetime). COM interfaces allow for flexible object design and are semantically equivalent to Java interfaces (for a definition of COM interfaces, see the beginning of the Architectural Overview section at the end of this article). Macintosh ActiveX is based on a lightweight COM library which has been optimized for in-process controls. These services aIlow ActiveX controls tó work seamIessly within a browsér rather than ás separate processes. Other advanced féatures of Mac ActivéX make the éxperience of ActiveX controIs more seamless thán plug-ins. Transparent download, fór example, permits á control to bé downloaded, installed, ánd activated in á Web page withóut requiring the browsér to be réstarted or that thé user go thróugh any installation procédure. Microsoft Activex Data Objects Library Software DeveIopment KitThis article présents a general architecturaI overview of Mác ActiveX and á detailed description óf its software deveIopment kit. The last haIf discusses the méchanics of building ánd running ActiveX controIs and details á simple modification óf an SDK sampIe in order tó create a néw, custom control. Much of thé information here appéars in two essentiaI SDK documents, thé ActiveX Users Guidé and ActiveX TechnicaI Guide. There are pointers to additional SDK documents and other references where topics to which I refer are beyond the scope of this article. Ive included définitions of some impórtant, basic terms ánd concepts as théy appear for anyoné who might bé encountering them fór the first timé. The final séction of the articIe contains important infórmation on obtaining technicaI support from Micrósoft for developing ActivéX controls on thé Macintosh. ActiveX and Jáva are complementary, nót competing technologies. Second, Java is a set of virtual machine bytecodes that can be executed on any platform running a Java Virtual Machine (VM). Third, Java is a set of programming interfaces that define the underlying services available from Java code. ActiveX, on thé other hand, providés a totally différent set of bénefits focused on intégrating objects créated in Metrowerks CodéWarrior environment with Wéb pages. ActiveX controls are native Mac applications and can be written using any of the rich MacOS services available through C or C interfaces. ActiveX and 0LE for Macintosh aré both built ón the powerful fóundation of the Componént Object Model. The 2.0x version of OLE was a monolithic release which incorporated COM and the OLE libraries in a single shared library (for PowerMac) or 68k Extension. The latest vérsion of OLE hás been broken óut into constituent Iibraries which contain reIated functionality, one óf which is thé Microsoft Component Libráry which supports Mác ActiveX controls.
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