helloworld就是我们扩展的一个方法，当点击按钮的时候external对象会调用helloworld方法调用本地代码，对于external对象则会调用上面提到的getexternal方法来查询是否提供了扩展，下面是如何实现getexternal方法来实现扩展external对象，代码如下：
| class mydochandler :public idochostuihandler { long refcount; public: mydochandler() :refcount(1){ } virtual hresult stdmethodcalltype queryinterface(refiid classid, void** intf) { if (classid == iid_iunknown) { *intf = (iunknown*)this; addref(); } else if (classid == iid_idochostuihandler) { *intf = (idochostuihandler*)this; addref(); } else if (classid == iid_idispatch) { *intf = (idispatch*)this; addref(); } else return e_nointerface; return s_ok; } virtual ulong stdmethodcalltype addref() { interlockedincrement(&refcount); return refcount; } virtual ulong stdmethodcalltype release() { interlockeddecrement(&refcount); if (refcount == 0) delete this; return refcount; } //返回s_ok，屏蔽掉右键菜单 virtual hresult stdmethodcalltype showcontextmenu( /* [in] */ dword dwid, /* [in] */ point __rpc_far *ppt, /* [in] */ iunknown __rpc_far *pcmdtreserved, /* [in] */ idispatch __rpc_far *pdispreserved) { return s_ok; } virtual hresult stdmethodcalltype gethostinfo( /* [out][in] */ dochostuiinfo __rpc_far *pinfo) { return e_notimpl; } virtual hresult stdmethodcalltype showui( /* [in] */ dword dwid, /* [in] */ ioleinplaceactiveobject __rpc_far *pactiveobject, /* [in] */ iolecommandtarget __rpc_far *pcommandtarget, /* [in] */ ioleinplaceframe __rpc_far *pframe, /* [in] */ ioleinplaceuiwindow __rpc_far *pdoc) { return e_notimpl; } virtual hresult stdmethodcalltype hideui( void) { return e_notimpl; } virtual hresult stdmethodcalltype updateui( void) { return e_notimpl; } virtual hresult stdmethodcalltype enablemodeless( /* [in] */ bool fenable) { return e_notimpl; } virtual hresult stdmethodcalltype ondocwindowactivate( /* [in] */ bool factivate) { return e_notimpl; } virtual hresult stdmethodcalltype onframewindowactivate( /* [in] */ bool factivate) { return e_notimpl; } virtual hresult stdmethodcalltype resizeborder( /* [in] */ lpcrect prcborder, /* [in] */ ioleinplaceuiwindow __rpc_far *puiwindow, /* [in] */ bool framewindow) { return e_notimpl; } virtual hresult stdmethodcalltype translateaccelerator( /* [in] */ lpmsg lpmsg, /* [in] */ const guid __rpc_far *pguidcmdgroup, /* [in] */ dword ncmdid) { return e_notimpl; } virtual hresult stdmethodcalltype getoptionkeypath( /* [out] */ lpolestr __rpc_far *pchkey, /* [in] */ dword dw) { return e_notimpl; } virtual hresult stdmethodcalltype getdroptarget( /* [in] */ idroptarget __rpc_far *pdroptarget,
本文关键：一种全新的软件界面设计方法
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