View source for VCOM:IVWUnknown

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== What is this? ==

This interface gives the fundamental capability of an interface to participate in VectorWorks' [[VCOM:VCOM (VectorWorks Component Object Model)]].

An interface is a VCOM interface if it inherits directly or indirectly this base interface class.

<code lang="cpp">
// ---------------------------------------------------------------------------------------------------
// Base interface for all interfaces in VCOM
class IVWUnknown
{
public:
	virtual					~IVWUnknown( void )	{}
	virtual long VCOM_CALLTYPE		AddRef() = 0;
	virtual long VCOM_CALLTYPE		Release() = 0;
	
};
</code>

<b>Note</b> The empty destructor is necessary to satisfy the XCode Mac compiler. Otherwise it producess tons of warnings.

Every VCOM interface is recognized by the VectorWorks by it's [[VCOM:VWIID]]. This means that each interface should have one [[VCOM:VWIID]] defined.

<b>Note</b> Some interface doesn't have [[VCOM:VWIID]] defined. This is in purpose because they are not ment to be queried ([[SDK:GS_VWQueryInterface]] or [[VCOM:VCOMPtr]]) They are obtained through another VCOM interface that has 'get' or 'query' function.

== Sample ==

<code lang="cpp">
// --------------------------------------------------------------------------------------------------
// {B5706042-BF87-4cff-9BD9-3A08B01C183C}
static const VWIID IID_VCOMSample = { 0xb5706042, 0xbf87, 0x4cff, { 0x9b, 0xd9, 0x3a, 0x8, 0xb0, 0x1c, 0x18, 0x3c } };
 
class IVCOMSample : public IVWUnknown
{
public:
    virtual VCOMError VCOM_CALLTYPE Function() = 0;
};
</code>

== See Also ==

[[VCOM:IVWSingletonUnknown]]

[[Category:VCOM|IVWUnknown]]