COMVariant.iUnknown Method

Article
2014-04-11

Gets or sets the value of a COMVariant object of the VT_UNKNOWN (IUnknown) data type.

Syntax

public ComInterface iUnknown([ComInterface newValue])

Run On

Called

Parameters

newValue
Type: ComInterface Extended Data Type
The new value; optional.

Return Value

Type: ComInterface Extended Data Type
The current value.

Remarks

If you pass in a value that has a different data type than the object, the data type of the object will be changed to match the data type value.

A COMVariant object has an IUnknown data type if its data type is set to COMVariantType::VT_UNKNOWN.

The IUnknown data type is a COM data type that provides a handle to a COM IUnknown interface.

Examples

The following example creates a new COMVariant object of type VT_UNKNOWN.

{ 
    COMVariant var = new COMVariant( 
        COMVariantInOut::IN_OUT,  
        COMVariantType::VT_UNKNOWN); 
    COMInterface comInterface; 
  
    // comInterface variable is assigned 
    // a COM IUnknown interface 
    // ... 
  
    // Set value of the object 
    var.iUnknown(comInterface); 
}

Share via