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QAxBase(3qt)							  QAxBase(3qt)

NAME
       QAxBase - Abstract class that provides an API to initalize and access a
       COM object

SYNOPSIS
       This class is part of the Qt ActiveQt Extension.

       #include <qaxbase.h>

       Inherited by QAxObject and QAxWidget.

   Public Members
       QAxBase ( IUnknown * iface = 0 )
       virtual ~QAxBase ()
       QString control () const
       long queryInterface ( const QUuid & uuid, void ** iface ) const
       QVariant dynamicCall ( const QCString & function, const QVariant & var1
	   = QVariant ( ), const QVariant & var2 = QVariant ( ), const
	   QVariant & var3 = QVariant ( ), const QVariant & var4 = QVariant (
	   ), const QVariant & var5 = QVariant ( ), const QVariant & var6 =
	   QVariant ( ), const QVariant & var7 = QVariant ( ), const QVariant
	   & var8 = QVariant ( ) )
       QVariant dynamicCall ( const QCString & function, QValueList<QVariant>
	   & vars )
       QAxObject * querySubObject ( const QCString & name, const QVariant &
	   var1 = QVariant ( ), const QVariant & var2 = QVariant ( ), const
	   QVariant & var3 = QVariant ( ), const QVariant & var4 = QVariant (
	   ), const QVariant & var5 = QVariant ( ), const QVariant & var6 =
	   QVariant ( ), const QVariant & var7 = QVariant ( ), const QVariant
	   & var8 = QVariant ( ) )
       PropertyBag propertyBag () const
       void setPropertyBag ( const PropertyBag & bag )
       QString generateDocumentation ()
       virtual bool propertyWritable ( const char * prop ) const
       virtual void setPropertyWritable ( const char * prop, bool ok )
       bool isNull () const
       QVariant asVariant () const
       enum PropertyBag { }
       virtual void clear ()
       bool setControl ( const QString & )
       void disableMetaObject ()
       void disableClassInfo ()
       void disableEventSink ()

   Signals
       void signal ( const QString & name, int argc, void * argv )
       void propertyChanged ( const QString & name )
       void exception ( int code, const QString & source, const QString &
	   desc, const QString & help )

   Properties
       QString control - the name of the COM object wrapped by this QAxBase
	   object

   Protected Members
       virtual bool initialize ( IUnknown ** ptr )
       bool initializeRemote ( IUnknown ** ptr )
       bool initializeLicensed ( IUnknown ** ptr )
       bool initializeActive ( IUnknown ** ptr )

DESCRIPTION
       This class is defined in the Qt ActiveQt Extension, which can be found
       in the qt/extensions directory. It is not included in the main Qt API.

       The QAxBase class is an abstract class that provides an API to
       initalize and access a COM object.

       QAxBase is an abstract class that cannot be used directly, and is
       instantiated through the subclasses QAxObject and QAxWidget. This class
       provides the API to access the COM object directly through its IUnknown
       implementation. If the COM object implements the IDispatch interface,
       the properties and methods of that object become available as Qt
       properties and slots.

	   connect( buttonBack, SIGNAL(clicked()), webBrowser, SLOT(GoBack()) );

       Properties exposed by the object's IDispatch implementation can be read
       and written through the property system provided by the Qt Object Model
       (both subclasses are QObjects, so you can use setProperty() and
       property() as with QObject). Properties with multiple parameters are
       not supported.

	   activeX->setProperty( "text", "some text" );
	   int value = activeX->property( "value" );

       Write-functions for properties and other methods exposed by the
       object's IDispatch implementation can be called directly using
       dynamicCall(), or indirectly as slots connected to a signal.

	   webBrowser->dynamicCall( "GoHome()" );

       Outgoing events supported by the COM object are emitted as standard Qt
       signals.

	   connect( webBrowser, SIGNAL(TitleChanged(const QString&)),
		    this, SLOT(setCaption(const QString&)) );

       QAxBase transparently converts between COM data types and the
       equivalent Qt data types. Some COM types have no equivalent Qt data
       structure.

       Supported COM datatypes are listed in the first column of following
       table. The second column is the Qt type that can be used with the
       QObject property functions. The third column is the Qt type that is
       used in the prototype of generated signals and slots for in-parameters,
       and the last column is the Qt type that is used in the prototype of
       signals and slots for out-parameters. <center>.nf

       </center>

       Supported are also enumerations, and typedefs to supported types.

       To call the methods of a COM interface described by the following IDL

	   dispinterface IControl
	   {
	   properties:
	       [id(1)] BSTR text;
	       [id(2)] IFontDisp *font;
	   methods:
	       [id(6)] void showColumn( [in] int i );
	       [id(3)] bool addColumn( [in] BSTR t );
	       [id(4)] int fillList( [in, out] SAFEARRAY(VARIANT) *list );
	       [id(5)] IDispatch *item( [in] int i );
	   };
       use the QAxBase API like this:

	   QAxObject object( "<CLSID>" );
	   QString text = object.property( "text" ).toString();
	   object.setProperty( "font", QFont( "Times New Roman", 12 ) );
	   connect( this, SIGNAL(clicked(int)), &object, SLOT(showColumn(int)) );
	   bool ok = object.dynamicCall( "addColumn(const QString&)", "Column 1" ).toBool();
	   QValueList<QVariant> varlist;
	   QValueList<QVariant> parameters;
	   parameters << QVariant( varlist );
	   int n = object.dynamicCall( "fillList(QValueList<QVariant>&)", parameters ).toInt();
	   QAxObject *item = object.querySubItem( "item(int)", 5 );

       Note that the QValueList the object should fill has to be provided as
       an element in the parameter list of QVariants.

       If you need to access properties or pass parameters of unsupported
       datatypes you must access the COM object directly through its IDispatch
       implementation or other interfaces. Those interfaces can be retrieved
       through queryInterface().

	   IUnknown *iface = 0;
	   activeX->queryInterface( IID_IUnknown, (void**)&iface );
	   if ( iface ) {
	       // use the interface
	       iface->Release();
	   }

       To get the definition of the COM interfaces you will have to use the
       header files provided with the component you want to use. Some
       compilers can also import type libraries using the #import compiler
       directive. See the component documentation to find out which type
       libraries you have to import, and how to use them.

       If you need to react to events that pass parameters of unsupported
       datatypes you can use the generic signal that delivers the event data
       as provided by the COM event.

   Member Type Documentation
QAxBase::PropertyBag
       A QMap<QString,QVariant> that can store properties as name:value pairs.

MEMBER FUNCTION DOCUMENTATION
QAxBase::QAxBase ( IUnknown * iface = 0 )
       Creates a QAxBase object that wraps the COM object iface. If iface is 0
       (the default), use setControl() to instantiate a COM object.

QAxBase::~QAxBase () [virtual]
       Shuts down the COM object and destroys the QAxBase object.

       See also clear().

QVariant QAxBase::asVariant () const
       Returns a QVariant that wraps the COM object. The variant can then be
       used as a parameter in e.g. dynamicCall().

void QAxBase::clear () [virtual]
       Disconnects and destroys the COM object.

       If you reimplement this function you must also reimplement the
       destructor to call clear(), and call this implementation at the end of
       your clear() function.

QString QAxBase::control () const
       Returns the name of the COM object wrapped by this QAxBase object. See
       the "control" property for details.

void QAxBase::disableClassInfo ()
       Disables the class info generation for this ActiveX container. If you
       don't require any class information about the ActiveX control use this
       function to speed up the meta object generation.

       Note that this function must be called immediately after construction
       of the object (without passing an object identifier), and before
       calling QAxWidget->setControl().

void QAxBase::disableEventSink ()
       Disables the event sink implementation for this ActiveX container. If
       you don't intend to listen to the ActiveX control's events use this
       function to speed up the meta object generation.

       Some ActiveX controls might be unstable when connected to an event
       sink. To get OLE events you must use standard COM methods to register
       your own event sink. Use queryInterface() to get access to the raw COM
       object.

       Note that this function should be called immediately after construction
       of the object (without passing an object identifier), and before
       calling QAxWidget->setControl().

void QAxBase::disableMetaObject ()
       Disables the meta object generation for this ActiveX container. This
       also disables the event sink and class info generation. If you don't
       intend to use the Qt meta object implementation call this function to
       speed up the meta object generation.

       Some ActiveX controls might be unstable when used with OLE automation.
       Use standard COM methods to use those controls through the COM
       interfaces provided by queryInterface().

       Note that this function must be called immediately after construction
       of the object (without passing an object identifier), and before
       calling QAxWidget->setControl().

QVariant QAxBase::dynamicCall ( const QCString & function, const QVariant &
       var1 = QVariant ( ), const QVariant & var2 = QVariant ( ), const
       QVariant & var3 = QVariant ( ), const QVariant & var4 = QVariant ( ),
       const QVariant & var5 = QVariant ( ), const QVariant & var6 = QVariant
       ( ), const QVariant & var7 = QVariant ( ), const QVariant & var8 =
       QVariant ( ) )
       Calls the COM object's method function, passing the parameters var1,
       var1, var2, var3, var4, var5, var6, var7 and var8, and returns the
       value returned by the method, or an invalid QVariant if the method does
       not return a value or when the function call failed.

       If function is a method of the object the string must be provided as
       the full prototype, for example as it would be written in a
       QObject::connect() call.

	   activeX->dynamicCall( "Navigate(const QString&)", "www.trolltech.com" );

       Alternatively a function can be called passing the parameters embedded
       in the string, e.g. above function can also be invoked using

	   activeX->dynamicCall("Navigate(\"www.trolltech.com\");
       All parameters are passed as strings; it depends on the control whether
       they are interpreted correctly, and is slower than using the prototype
       with correctly typed parameters.

       If function is a property the string has to be the name of the
       property. The property setter is called when var1 is a valid QVariant,
       otherwise the getter is called.

	   activeX->dynamicCall( "Value", 5 );
	   QString text = activeX->dynamicCall( "Text" ).toString();
       Note that it is faster to get and set properties using
       QObject::property() and QObject::setProperty().

       It is only possible to call functions through dynamicCall() that have
       parameters or return values of datatypes supported by QVariant. See the
       QAxBase class documentation for a list of supported and unsupported
       datatypes. If you want to call functions that have unsupported
       datatypes in the parameter list, use queryInterface() to retrieve the
       appropriate COM interface, and use the function directly.

	   IWebBrowser2 *webBrowser = 0;
	   activeX->queryInterface( IID_IWebBrowser2, (void**)&webBrowser );
	   if ( webBrowser ) {
	       webBrowser->Navigate2( pvarURL );
	       webBrowser->Release();
	   }

       This is also more efficient.

       Example: qutlook/centralwidget.cpp.

QVariant QAxBase::dynamicCall ( const QCString & function,
       QValueList<QVariant> & vars )
       This is an overloaded member function, provided for convenience. It
       behaves essentially like the above function.

       Calls the COM object's method function, passing the parameters in vars,
       and returns the value returned by the method. If the method does not
       return a value or when the function call failed this function returns
       an invalid QVariant object.

       The QVariant objects in vars are updated when the method has out-
       parameters.

void QAxBase::exception ( int code, const QString & source, const QString &
       desc, const QString & help ) [signal]
       This signal is emitted when the COM object throws an exception while
       called using the OLE automation interface IDispatch. code, source, desc
       and help provide information about the exception as provided by the COM
       server and can be used to provide useful feedback to the end user. help
       includes the help file, and the help context ID in brackets, e.g.
       "filename [id]".

QString QAxBase::generateDocumentation ()
       Returns a rich text string with documentation for the wrapped COM
       object. Dump the string to an HTML-file, or use it in e.g. a
       QTextBrowser widget.

bool QAxBase::initialize ( IUnknown ** ptr ) [virtual protected]
       This virtual function is called by setControl() and creates the
       requested COM object. ptr is set to the object's IUnknown
       implementation. The function returns TRUE if the object initialization
       succeeded; otherwise the function returns FALSE.

       The default implementation interprets the string returned by control(),
       and calls initializeRemote(), initializeLicensed() or
       initializeActive() if the string matches the respective patterns. If no
       pattern is matched, or if remote or licensed initialization fails,
       CoCreateInstance is used directly to create the object.

       See the control property documentation for details about supported
       patterns.

       The interface returned in ptr must be referenced exactly once when this
       function returns. The interface provided by e.g. CoCreateInstance is
       already referenced, and there is no need to reference it again.

bool QAxBase::initializeActive ( IUnknown ** ptr ) [protected]
       Returns an active instance running on the current machine, and returns
       the IUnknown interface to the running object in ptr. This function
       returns TRUE if successful, otherwise returns FALSE.

       This function is called by initialize() if the control string contains
       the substring "}&".

       See also initialize().

bool QAxBase::initializeLicensed ( IUnknown ** ptr ) [protected]
       Creates an instance of a licensed control, and returns the IUnknown
       interface to the object in ptr. This functions returns TRUE if
       successful, otherwise returns FALSE.

       This function is called by initialize() if the control string contains
       the substring "}:". The license key needs to follow this substring.

       See also initialize().

bool QAxBase::initializeRemote ( IUnknown ** ptr ) [protected]
       Creates the instance on a remote server, and returns the IUnknown
       interface to the object in ptr. This function returns TRUE if
       successful, otherwise returns FALSE.

       This function is called by initialize() if the control string contains
       the substring "/{". The information about the remote machine needs to
       be provided in front of the substring.

       See also initialize().

bool QAxBase::isNull () const
       Returns TRUE if there is no COM object loaded by this wrapper;
       otherwise return FALSE.

       See also control.

PropertyBag QAxBase::propertyBag () const
       Returns a name:value map of all the properties exposed by the COM
       object.

       This is more efficient than getting multiple properties individually if
       the COM object supports property bags.

       Warning: It is not guaranteed that the property bag implementation of
       the COM object returns all properties, or that the properties returned
       are the same as those available through the IDispatch interface.

void QAxBase::propertyChanged ( const QString & name ) [signal]
       If the COM object supports property notification, this signal gets
       emitted when the property called name is changed.

bool QAxBase::propertyWritable ( const char * prop ) const [virtual]
       Returns TRUE if the property prop is writable; otherwise returns FALSE.
       By default, all properties are writable.

       Warning: Depending on the control implementation this setting might be
       ignored for some properties.

       See also setPropertyWritable() and propertyChanged().

long QAxBase::queryInterface ( const QUuid & uuid, void ** iface ) const
       Requests the interface uuid from the COM object and sets the value of
       iface to the provided interface, or to 0 if the requested interface
       could not be provided.

       Returns the result of the QueryInterface implementation of the COM
       object.

       See also control.

QAxObject * QAxBase::querySubObject ( const QCString & name, const QVariant &
       var1 = QVariant ( ), const QVariant & var2 = QVariant ( ), const
       QVariant & var3 = QVariant ( ), const QVariant & var4 = QVariant ( ),
       const QVariant & var5 = QVariant ( ), const QVariant & var6 = QVariant
       ( ), const QVariant & var7 = QVariant ( ), const QVariant & var8 =
       QVariant ( ) )
       Returns a pointer to a QAxObject wrapping the COM object provided by
       the method or property name, passing passing the parameters var1, var1,
       var2, var3, var4, var5, var6, var7 and var8.

       If name is provided by a method the string must include the full
       function prototype.

       If name is a property the string must be the name of the property, and
       var1, ... var8 are ignored.

       The returned QAxObject is a child of this object (which is either of
       type QAxObject or QAxWidget), and is deleted when this object is
       deleted. It is however safe to delete the returned object yourself, and
       you should do so when you iterate over lists of subobjects.

       COM enabled applications usually have an object model publishing
       certain elements of the application as dispatch interfaces. Use this
       method to navigate the hierarchy of the object model, e.g.

	   QAxWidget outlook( "Outlook.Application" );
	   QAxObject *session = outlook.querySubObject( "Session" );
	   if ( session ) {
	       QAxObject *defFolder = session->querySubObject(
				       "GetDefaultFolder(OlDefaultFolders)",
				       "olFolderContacts" );
	       //...
	   }

       Example: qutlook/centralwidget.cpp.

bool QAxBase::setControl ( const QString & )
       Sets the name of the COM object wrapped by this QAxBase object. See the
       "control" property for details.

void QAxBase::setPropertyBag ( const PropertyBag & bag )
       Sets the properties of the COM object to the corresponding values in
       bag.

       Warning: You should only set property bags that have been returned by
       the propertyBag function, as it cannot be guaranteed that the property
       bag implementation of the COM object supports the same properties that
       are available through the IDispatch interface.

       See also propertyBag().

void QAxBase::setPropertyWritable ( const char * prop, bool ok ) [virtual]
       Sets the property prop to writable if ok is TRUE, otherwise sets prop
       to be read-only. By default, all properties are writable.

       Warning: Depending on the control implementation this setting might be
       ignored for some properties.

       See also propertyWritable() and propertyChanged().

void QAxBase::signal ( const QString & name, int argc, void * argv ) [signal]
       This generic signal gets emitted when the COM object issues the event
       name. argc is the number of parameters provided by the event
       (DISPPARAMS.cArgs), and argv is the pointer to the parameter values
       (DISPPARAMS.rgvarg). Note that the order of parameter values is turned
       around, ie. the last element of the array is the first parameter in the
       function.

	   void Receiver::slot( const QString &name, int argc, void *argv )
	   {
	       VARIANTARG *params = (VARIANTARG*)argv;
	       if ( name.startsWith( "BeforeNavigate2(" ) ) {
		   IDispatch *pDisp = params[argc-1].pdispVal;
		   VARIANTARG URL = *params[argc-2].pvarVal;
		   VARIANTARG Flags = *params[argc-3].pvarVal;
		   VARIANTARG TargetFrameName = *params[argc-4].pvarVal;
		   VARIANTARG PostData = *params[argc-5].pvarVal;
		   VARIANTARG Headers = *params[argc-6].pvarVal;
		   bool *Cancel = params[argc-7].pboolVal;
	       }
	   }

       Use this signal if the event has parameters of unsupported data types.
       Otherwise, connect directly to the signal name.

   Property Documentation
QString control
       This property holds the name of the COM object wrapped by this QAxBase
       object.

       Setting this property initilializes the COM object. Any COM object
       previously set is shut down.

       The most efficient way to set this property is by using the registered
       component's UUID, e.g.

	   ctrl->setControl( "{8E27C92B-1264-101C-8A2F-040224009C02}" );
       The second fastest way is to use the registered control's class name
       (with or without version number), e.g.

	   ctrl->setControl( "MSCal.Calendar" );
       The slowest, but easiest way to use is to use the control's full name,
       e.g.

	   ctrl->setControl( "Calendar Control 9.0" );

       If the component's UUID is used the following patterns can be used to
       initialize the control on a remote machine, to initialize a licensed
       control or to connect to a running object:

       To initialize the control on a different machine use the following
       pattern:

		  <domain/username>:<password>@server/{8E27C92B-1264-101C-8A2F-040224009C02}

       To initialize a licensed control use the following pattern:

		  {8E27C92B-1264-101C-8A2F-040224009C02}:<LicenseKey>

       To connect to an already running object use the following pattern:

		  {8E27C92B-1264-101C-8A2F-040224009C02}&
	      The first two patterns can be combined, e.g. to initialize a
	      licensed control on a remote machine:

	   ctrl->setControl("DOMAIN/user:password@server/{8E27C92B-1264-101C-8A2F-040224009C02}:LicenseKey");

       The control's read function always returns the control's UUID, if
       provided including the license key, and the name of the server, but not
       including the username, the domain or the password.

       Set this property's value with setControl() and get this property's
       value with control().

SEE ALSO
       http://doc.trolltech.com/qaxbase.html
       http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the
       license file included in the distribution for a complete license
       statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to
       help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is
       located at $QTDIR/doc/html and can be read using Qt Assistant or with a
       web browser. This man page is provided as a convenience for those users
       who prefer man pages, although this format is not officially supported
       by Trolltech.

       If you find errors in this manual page, please report them to qt-
       bugs@trolltech.com.  Please include the name of the manual page
       (qaxbase.3qt) and the Qt version (3.3.8).

Trolltech AS			2 February 2007			  QAxBase(3qt)
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