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<TITLE>Chapter 11</TITLE>
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<H1>Chapter 11<BR>
Advanced ActiveX Control Development with BaseCtl</H1>
<UL>
<LI><A HREF="#Heading1">Advanced ActiveX Control Development with BaseCtl</A>
<UL>
<LI><A HREF="#Heading2">Creating Properties</A>
<UL>
<LI><A HREF="#Heading3">Creating Asynchronous Properties</A>
<LI><A HREF="#Heading4">Listing 11.1 BCFCONTROLCTL.H--Modified BCFControlControl
Class Definition</A>
<LI><A HREF="#Heading5">Listing 11.2 BCFCONTROLCTL.CPP--BCFControlControl Constructor
Implementation Change</A>
<LI><A HREF="#Heading6">Listing 11.3 BCFCONTROLCTL.CPP--OnData Function</A>
<LI><A HREF="#Heading7">Listing 11.4 DISPIDS.H--Add Data Path Property Dispid</A>
<LI><A HREF="#Heading8">Listing 11.5 BCFCONTROL.ODL--BCFControl ODL Implementation</A>
<LI><A HREF="#Heading9">Listing 11.6 BCFCONTROLCTL.H--ReadyState Property Prototype</A>
<LI><A HREF="#Heading10">Listing 11.7 BCFCONTROLCTL.CPP--Member Initialization</A>
<LI><A HREF="#Heading11">Listing 11.8 BCFCONTROLCTL.CPP--Property Implementation</A>
<LI><A HREF="#Heading12">Listing 11.9 BCFCONTROLCTL.CPP--OnData Implementation</A>
<LI><A HREF="#Heading13">Static and Dynamic Property Enumeration</A>
<LI><A HREF="#Heading14">Listing 11.10 PERPROPERTYBROWSING.H--IPerPropertyBrowsing
Interface Macro</A>
<LI><A HREF="#Heading15">Listing 11.11 BCFCONTROLCTL.H--IPerPropertyBrowsing Interface
Declaration</A>
<LI><A HREF="#Heading16">Listing 11.12 BCFCONTROLCTL.CPP--QueryInterface Implementation
of IPerPropertyBrowsing</A>
<LI><A HREF="#Heading17">Listing 11.13 BCFCONTROLCTL.CPP--IPerPropertyBrowsing Implementation</A>
</UL>
<LI><A HREF="#Heading18">Drawing the Control</A>
<UL>
<LI><A HREF="#Heading19">Optimized Drawing</A>
<LI><A HREF="#Heading20">Listing 11.14 BCFCONTROLCTL.CPP--Optimized Drawing</A>
<LI><A HREF="#Heading21">Listing 11.15 BCFCONTROLCTL.CPP--BeforeDestroyWindow Implementation</A>
</UL>
<LI><A HREF="#Heading22">Adding Clipboard and Drag and Drop Support</A>
<UL>
<LI><A HREF="#Heading23">Clipboard Support</A>
<LI><A HREF="#Heading24">Listing 11.16 IDATAOBJECT.H--IDataObject Interface Macro</A>
<LI><A HREF="#Heading25">Listing 11.17 IENUMFORMATETC--IEnumFORMATETC Interface Macro</A>
<LI><A HREF="#Heading26">Listing 11.18 BCFCONTROLCTL.H--Clipboard Support Implementation--Header
File</A>
<LI><A HREF="#Heading27">Listing 11.19 BCFCONTROLCTL.CPP--Constructor Member Initialization</A>
<LI><A HREF="#Heading28">Listing 11.20 BCFCONTROLCTL.CPP--QueryInterface Update</A>
<LI><A HREF="#Heading29">Listing 11.21 BCFCONTROLCTL.CPP--WM_KEYDOWN Message Handler</A>
<LI><A HREF="#Heading30">Listing 11.22 BCFCONTROLCTL.CPP--CopyDataToClipboard Implementation</A>
<LI><A HREF="#Heading31">Listing 11.23 BCFCONTROLCTL.CPP--PrepareDataForTransfer
Implementation</A>
<LI><A HREF="#Heading32">Listing 11.24 BCFCONTROLCTL.CPP--CopyStgMedium Implementation</A>
<LI><A HREF="#Heading33">Listing 11.25 BCFCONTROLCTL.CPP--IDataObject Implementation</A>
<LI><A HREF="#Heading34">Listing 11.26 BCFCONTROLCTL.CPP--IEnumFORMATETC Implementation</A>
<LI><A HREF="#Heading35">Listing 11.27 BCFCONTROLCTL.CPP--OnKeyDown Implementation</A>
<LI><A HREF="#Heading36">Listing 11.28 BCFCONTROCTL.H--Clipboard Target Implementation--
Header File</A>
<LI><A HREF="#Heading37">Listing 11.29 BCFCONTROLCTL.CPP--GetDataFromClipboard Implementation</A>
<LI><A HREF="#Heading38">Listing 11.30 BCFCONTROLCTL.CPP--GetDataFromTransfer Implementation</A>
<LI><A HREF="#Heading39">Listing 11.31 BCFCONTROCTL.CPP--OnKeyDown Implementation</A>
<LI><A HREF="#Heading40">Adding Drag and Drop Support</A>
<LI><A HREF="#Heading41">Listing 11.32 IDROPSOURCE.H--IDropSource Interface</A>
<LI><A HREF="#Heading42">Listing 11.33 BCFCONTROCTL.H--IDropSource Interface Implementation</A>
<LI><A HREF="#Heading43">Listing 11.34 BCFCONTROLCTL.CPP--QueryInterface Update</A>
<LI><A HREF="#Heading44">Listing 11.35 BCFCONTROLCTL.CPP--WindowProc Implementation</A>
<LI><A HREF="#Heading45">Listing 11.36 BCFCONTROLCTL.CPP--Drop Source Implementation</A>
<LI><A HREF="#Heading46">Listing 11.37 IDROPTARGET.H--IDropTarget Interface</A>
<LI><A HREF="#Heading47">Listing 11.38 BCFCONTROLCTL.H--IDropTarget Implementation</A>
<LI><A HREF="#Heading48">Listing 11.39 BCFCONTROLCTL.CPP--QueryInterface Update</A>
<LI><A HREF="#Heading49">Listing 11.40 BCFCONTROLCTL.CPP--AfterCreateWindow Implementation</A>
<LI><A HREF="#Heading50">Listing 11.41 BCFCONTROLCTL.CPP--IDropTarget Implementation</A>
<LI><A HREF="#Heading51">Custom Clipboard and Drag and Drop Formats</A>
<LI><A HREF="#Heading52">Listing 11.42 BCFCONTROLCTL.H--Custom Data Format Member
Variables</A>
<LI><A HREF="#Heading53">Listing 11.43 BCFCONTROLCTL.CPP--Register the Custom Format</A>
<LI><A HREF="#Heading54">Listing 11.44 BCFCONTROCTL.CPP--PrepareDataForTransfer Update</A>
<LI><A HREF="#Heading55">Listing 11.45 BCFCONTROLCTL.CPP--GetDataFromTransfer Update</A>
<LI><A HREF="#Heading56">Listing 11.46 BCFCONTROLCTL.CPP--IEnumFORMATETC::Next Update</A>
<LI><A HREF="#Heading57">Listing 11.47 BCFCONTROLCTL.CPP--IEnumFORMATETC::GetData
Update</A>
</UL>
<LI><A HREF="#Heading58">Subclassing Existing Windows Controls</A>
<UL>
<LI><A HREF="#Heading59">Listing 11.48 BCFCONTROLSUBCTL.CPP--RegisterClassData Implementation</A>
</UL>
<LI><A HREF="#Heading60">Dual-Interface Controls</A>
<LI><A HREF="#Heading61">Other ActiveX Features</A>
<UL>
<LI><A HREF="#Heading62">Windowless Activation</A>
<LI><A HREF="#Heading63">Listing 11.49 BCFCONTROLCTL.H--BCFControControl ActiveX
Implementation</A>
<LI><A HREF="#Heading64">Listing 11.50 BCFCONTROLNOWIN.H--BCFControlNoWinControl
ActiveX Implementation</A>
<LI><A HREF="#Heading65">Unclipped Device Context</A>
<LI><A HREF="#Heading66">Flicker-Free Activation</A>
<LI><A HREF="#Heading67">Mouse Pointer Notifications When Inactive</A>
<LI><A HREF="#Heading68">Listing 11.51 BCFCONTROLNOWIN.H--Mouse Notifications</A>
<LI><A HREF="#Heading69">Optimized Drawing Code</A>
<LI><A HREF="#Heading70">Loads Properties Asynchronously</A>
</UL>
<LI><A HREF="#Heading71">From Here...</A>
</UL>
</UL>
<P>
<HR SIZE="4">
<H1><A NAME="Heading1"></A>Advanced ActiveX Control Development with BaseCtl</H1>
<UL>
<LI><B>Asynchronous properties</B>
<SPACER TYPE="VERTICAL" SIZE="2">
Supporting asynchronous properties in the BaseCtl sample shows what is happening
behind the scenes when properties are loaded asynchronously.
<P>
<LI><B>Property enumeration</B>
<SPACER TYPE="VERTICAL" SIZE="2">
Property enumeration is exposed through a simple COM interface, which is easy to
add given the BaseCtl architecture.
<P>
<LI><B>Optimized drawing</B>
<SPACER TYPE="VERTICAL" SIZE="2">
Optimized drawing has positive effects on the performance of the control. Like MFC
and ATL, BaseCtl support of optimized drawing is trivial.
<P>
<LI><B>Clipboard and Drag and Drop</B>
<SPACER TYPE="VERTICAL" SIZE="2">
Adding Clipboard and Drag and Drop support to your BaseCtl implementation is similar
to the MFC and ATL implementations.
<P>
<LI><B>Windows and dual-interface controls</B>
<SPACER TYPE="VERTICAL" SIZE="2">
Subclassing an existing Windows control reduces development time when creating new
control implementations. Like ATL,
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