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TCustomVariantType.OlePromotion Method
TCustomVariantType Class | TCustomVariantType Members | Variants Namespace | Description | See Also
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Indicates the type to which a Variant value must be cast to make it Automation-compatible.

Pascal
function OlePromotion(const V: TVarData; out RequiredVarType: TVarType): Boolean; virtual;
C++
virtual __fastcall Boolean OlePromotion(const TVarData V, TVarType RequiredVarType);
Description

Override OlePromotion to indicate when a Variant of this custom Variant type must be cast to another type before it can be auto-marshaled using an Automation interface. 

V is the TVarData record for the custom Variant that the application wants to marshal. 

RequiredVarType returns the type to which V must be cast before it is Automation-compatible. 

OlePromotion returns true if V can be cast to an Automation-compatible type, false if there is no type to which V can be cast. 

As implemented in TCustomVariantType, OlePromotion sets RequiredVarType to varOleStr and returns true if V does not already represent a Unicode string. 

 

See Also
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