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<title>The TQAxContainer Module</title>
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<font color="#004faf">Home</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>The TQAxContainer Module</h1>
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<p>
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<p> <!-- toc -->
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<ul>
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<li><a href="#1"> Introduction
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</a>
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<li><a href="#2"> Building the library
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</a>
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<li><a href="#3"> Using the library
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</a>
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<ul>
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<li><a href="#3-1"> Distributing TQAxContainer applications
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</a>
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</ul>
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<li><a href="#4"> Instantiating COM objects
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</a>
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<li><a href="#5"> Accessing the object API
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</a>
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<ul>
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<li><a href="#5-1"> Typical error messages
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</a>
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<ul>
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<li><a href="#5-1-1"> Requested control could not be instantiated
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</a>
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<li><a href="#5-1-2"> TQAxBase::internalInvoke: No such method
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</a>
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<li><a href="#5-1-3"> Error calling IDispatch member: Non-optional parameter
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missing
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</a>
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<li><a href="#5-1-4"> Error calling IDispatch member: Type mismatch in
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parameter n
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</a>
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<li><a href="#5-1-5"> TQAxScriptManager::call(): No script provides this function
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</a>
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</ul>
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</ul>
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</ul>
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<!-- endtoc -->
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<p> <h2> Introduction
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</h2>
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<a name="1"></a><p> The TQAxContainer module provides a library implementing a <a href="ntqwidget.html">TQWidget</a>
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subclass, <a href="qaxwidget.html">TQAxWidget</a>, that acts as a container for ActiveX
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controls, and a <a href="ntqobject.html">TQObject</a> subclass, <a href="qaxobject.html">TQAxObject</a>, that can be used to
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easily access non-visual COM objects. Scripting COM objects embedded
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using these classes is possible through the <a href="qaxscript.html">TQAxScript</a>, <a href="qaxscriptmanager.html">TQAxScriptManager</a>
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and <a href="qaxscriptengine.html">TQAxScriptEngine</a> classes.
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<p> This module is part of the <a href="activentqt.html">ActiveTQt
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framework</a>. (To make an application into an ActiveX server
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see the <a href="qaxserver.html">TQAxServer module</a>.)
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<p> The module consists of six classes
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<ol type=1>
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<li> <a href="qaxbase.html">TQAxBase</a> is an abstract class that provides an API to initialize
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and access a COM/ActiveX object.
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<li> <a href="qaxobject.html">TQAxObject</a> provides a TQObject that wraps a COM object.
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<li> <a href="qaxwidget.html">TQAxWidget</a> is a <a href="ntqwidget.html">TQWidget</a> that wraps an ActiveX control.
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<li> <a href="qaxscriptmanager.html">TQAxScriptManager</a>, TQAxScript and TQAxScriptEngine provide an
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interface to the Windows Script Host.
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</ol>
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<p> Some <a href="qaxcontainer-examples.html">example applications</a>
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that use standard ActiveX controls to provide high level user
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interface functionality are provided.
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<p> <h2> Building the library
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</h2>
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<a name="2"></a><p> In the <tt>activeqt</tt> directory (usually <tt>QTDIR/extensions/activeqt</tt>)
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enter the <tt>container</tt> subdirectory and run <tt>qmake</tt> to generate the
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makefile, and use the make tool (<tt>nmake</tt> for VC++, <tt>make</tt> for Borland)
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to build the library. The library <tt>qaxcontainer.lib</tt> will be linked
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into <tt>QTDIR/lib</tt>.
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<p> If you have a shared configuration of TQt enter the <tt>plugin</tt> subdirectory
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and run <tt>qmake</tt> and your make tool to build a plugin that integrates the
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<a href="qaxwidget.html">TQAxWidget</a> class into <a href="designer-manual.html">TQt Designer</a>.
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<p> <h2> Using the library
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</h2>
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<a name="3"></a><p> To build TQt applications that can host COM objects and ActiveX controls
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link the application against the TQAxContainer module by adding
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<p> <pre>
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LIBS += qaxcontainer.lib
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</pre>
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<p> to the application's <tt>.pro</tt> file.
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<p> <h3> Distributing TQAxContainer applications
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</h3>
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<a name="3-1"></a><p> The TQAxContainer library is static, so there is no need to redistribute
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any additional files when using this module. Note however that the
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ActiveX server binaries you are using might not be installed on the
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target system, so you have to ship them with your package and register
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them during the installation process of your application.
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<p> <h2> Instantiating COM objects
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</h2>
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<a name="4"></a><p> To instantiate a COM object use the <a href="qaxbase.html#setControl">TQAxBase::setControl</a>() API, or pass
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the name of the object directly into the constructor of the <a href="qaxbase.html">TQAxBase</a>
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subclass you are using.
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<p> The control can be specified in a variety of formats, but the fastest
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and most powerful format is to use the class ID (CLSID) of the object
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directly. The class ID can be prepended with information about a remote
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machine that the object should run on, and can include a license key
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for licensed controls.
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<p> <h2> Accessing the object API
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</h2>
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<a name="5"></a><p> <a href="activentqt.html#ActiveTQt">ActiveTQt</a> provides a TQt API to the COM object, and replaces COM
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datatypes with TQt equivalents. Use the <tt>dumpdoc</tt> tool to get the
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documentation of the TQt API for any COM object and it's subobjects.
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<p> See the <a href="qaxwidget.html">TQAxWidget</a> and <a href="qaxobject.html">TQAxObject</a> API documentation about how to
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use this class to use ActiveX controls and COM objects in TQt
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applications. To access the COM object with scripting languages use
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the <a href="qaxscript.html">TQAxScript</a> class.
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<p> To call functions of the COM object that can not be accessed via
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ActiveTQt it is possible to request the COM interface directly using
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<a href="qaxbase.html#queryInterface">TQAxBase::queryInterface</a>(). To get a C++ definition of the respective
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interface classes use the <tt>#import</tt> directive with the type library
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provided with the control.
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<p> <h3> Typical error messages
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</h3>
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<a name="5-1"></a><p> ActiveTQt prints error messages to the debug output when it
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encounters error situations at runtime. Usually you must run
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your program in the debugger to see these messages (e.g. in Visual
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Studio's Debug output).
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<p> <h4> Requested control could not be instantiated
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</h4>
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<a name="5-1-1"></a><p> The control requested in <a href="qaxbase.html#setControl">TQAxBase::setControl</a>() is not installed
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on this system, or is not accessible for the current user.
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<p> The control might require administrator rights, or a license key.
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If the control is licensed, reimplement initialize() and use the
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COM APIs to call the IClassFactory2 interface functions.
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<p> <h4> TQAxBase::internalInvoke: No such method
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</h4>
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<a name="5-1-2"></a><p> A <tt>dynamicCall()</tt> failed - the function prototype did not
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match any function available in the object's API.
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<p> <h4> Error calling IDispatch member: Non-optional parameter
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missing
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</h4>
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<a name="5-1-3"></a><p> A <tt>dynamicCall()</tt> failed - the function prototype was correct,
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but too few parameters were provided.
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<p> <h4> Error calling IDispatch member: Type mismatch in
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parameter n
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</h4>
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<a name="5-1-4"></a><p> A <tt>dynamicCall()</tt> failed - the function prototype was correct,
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but the paramter at index <tt>n</tt> was of the wrong type and could
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not be coerced to the correct type.
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<p> <h4> <a href="qaxscriptmanager.html#call">TQAxScriptManager::call</a>(): No script provides this function
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</h4>
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<a name="5-1-5"></a><p> You try to call a function that is provided through an engine
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that doesn't provide introspection (ie. ActivePython or
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ActivePerl). You need to call the function directly on the
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respective <a href="qaxscript.html">TQAxScript</a> object.
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<p><address><hr><div align=center>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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